CVE-2024-50154 (GCVE-0-2024-50154)

Vulnerability from cvelistv5 – Published: 2024-11-07 09:31 – Updated: 2026-08-05 11:42
VLAI
Title
tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink(). Martin KaFai Lau reported use-after-free [0] in reqsk_timer_handler(). """ We are seeing a use-after-free from a bpf prog attached to trace_tcp_retransmit_synack. The program passes the req->sk to the bpf_sk_storage_get_tracing kernel helper which does check for null before using it. """ The commit 83fccfc3940c ("inet: fix potential deadlock in reqsk_queue_unlink()") added timer_pending() in reqsk_queue_unlink() not to call del_timer_sync() from reqsk_timer_handler(), but it introduced a small race window. Before the timer is called, expire_timers() calls detach_timer(timer, true) to clear timer->entry.pprev and marks it as not pending. If reqsk_queue_unlink() checks timer_pending() just after expire_timers() calls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will continue running and send multiple SYN+ACKs until it expires. The reported UAF could happen if req->sk is close()d earlier than the timer expiration, which is 63s by default. The scenario would be 1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(), but del_timer_sync() is missed 2. reqsk timer is executed and scheduled again 3. req->sk is accept()ed and reqsk_put() decrements rsk_refcnt, but reqsk timer still has another one, and inet_csk_accept() does not clear req->sk for non-TFO sockets 4. sk is close()d 5. reqsk timer is executed again, and BPF touches req->sk Let's not use timer_pending() by passing the caller context to __inet_csk_reqsk_queue_drop(). Note that reqsk timer is pinned, so the issue does not happen in most use cases. [1] [0] BUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0 Use-after-free read at 0x00000000a891fb3a (in kfence-#1): bpf_sk_storage_get_tracing+0x2e/0x1b0 bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda bpf_trace_run2+0x4c/0xc0 tcp_rtx_synack+0xf9/0x100 reqsk_timer_handler+0xda/0x3d0 run_timer_softirq+0x292/0x8a0 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 intel_idle_irq+0x5a/0xa0 cpuidle_enter_state+0x94/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6 allocated by task 0 on cpu 9 at 260507.901592s: sk_prot_alloc+0x35/0x140 sk_clone_lock+0x1f/0x3f0 inet_csk_clone_lock+0x15/0x160 tcp_create_openreq_child+0x1f/0x410 tcp_v6_syn_recv_sock+0x1da/0x700 tcp_check_req+0x1fb/0x510 tcp_v6_rcv+0x98b/0x1420 ipv6_list_rcv+0x2258/0x26e0 napi_complete_done+0x5b1/0x2990 mlx5e_napi_poll+0x2ae/0x8d0 net_rx_action+0x13e/0x590 irq_exit_rcu+0xf5/0x320 common_interrupt+0x80/0x90 asm_common_interrupt+0x22/0x40 cpuidle_enter_state+0xfb/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb freed by task 0 on cpu 9 at 260507.927527s: rcu_core_si+0x4ff/0xf10 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 cpuidle_enter_state+0xfb/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < 106e457953315e476b3642ef24be25ed862aaba3 (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < c964bf65f80a14288d767023a1b300b30f5b9cd0 (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < 8459d61fbf24967839a70235165673148c7c7f17 (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < 5071beb59ee416e8ab456ac8647a4dabcda823b1 (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < 997ae8da14f1639ce6fb66a063dab54031cd61b3 (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < 51e34db64f4e43c7b055ccf881b7f3e0c31bb26d (git)
Affected: 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af , < e8c526f2bdf1845bedaf6a478816a3d06fa78b8f (git)
Affected: d3a1196bfc462943694623412d8e03aaf172bdc1 (git)
Affected: 4.1.11 , < 4.2 (semver)
Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.170 , ≤ 5.15.* (semver)
Unaffected: 6.1.115 , ≤ 6.1.* (semver)
Unaffected: 6.6.59 , ≤ 6.6.* (semver)
Unaffected: 6.11.6 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\n\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\n\n  \"\"\"\n  We are seeing a use-after-free from a bpf prog attached to\n  trace_tcp_retransmit_synack. The program passes the req-\u003esk to the\n  bpf_sk_storage_get_tracing kernel helper which does check for null\n  before using it.\n  \"\"\"\n\nThe commit 83fccfc3940c (\"inet: fix potential deadlock in\nreqsk_queue_unlink()\") added timer_pending() in reqsk_queue_unlink() not\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\nsmall race window.\n\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\nto clear timer-\u003eentry.pprev and marks it as not pending.\n\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\ncontinue running and send multiple SYN+ACKs until it expires.\n\nThe reported UAF could happen if req-\u003esk is close()d earlier than the timer\nexpiration, which is 63s by default.\n\nThe scenario would be\n\n  1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\n     but del_timer_sync() is missed\n\n  2. reqsk timer is executed and scheduled again\n\n  3. req-\u003esk is accept()ed and reqsk_put() decrements rsk_refcnt, but\n     reqsk timer still has another one, and inet_csk_accept() does not\n     clear req-\u003esk for non-TFO sockets\n\n  4. sk is close()d\n\n  5. reqsk timer is executed again, and BPF touches req-\u003esk\n\nLet\u0027s not use timer_pending() by passing the caller context to\n__inet_csk_reqsk_queue_drop().\n\nNote that reqsk timer is pinned, so the issue does not happen in most\nuse cases. [1]\n\n[0]\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\n\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\nbpf_sk_storage_get_tracing+0x2e/0x1b0\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\nbpf_trace_run2+0x4c/0xc0\ntcp_rtx_synack+0xf9/0x100\nreqsk_timer_handler+0xda/0x3d0\nrun_timer_softirq+0x292/0x8a0\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\nintel_idle_irq+0x5a/0xa0\ncpuidle_enter_state+0x94/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\n\nallocated by task 0 on cpu 9 at 260507.901592s:\nsk_prot_alloc+0x35/0x140\nsk_clone_lock+0x1f/0x3f0\ninet_csk_clone_lock+0x15/0x160\ntcp_create_openreq_child+0x1f/0x410\ntcp_v6_syn_recv_sock+0x1da/0x700\ntcp_check_req+0x1fb/0x510\ntcp_v6_rcv+0x98b/0x1420\nipv6_list_rcv+0x2258/0x26e0\nnapi_complete_done+0x5b1/0x2990\nmlx5e_napi_poll+0x2ae/0x8d0\nnet_rx_action+0x13e/0x590\nirq_exit_rcu+0xf5/0x320\ncommon_interrupt+0x80/0x90\nasm_common_interrupt+0x22/0x40\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nfreed by task 0 on cpu 9 at 260507.927527s:\nrcu_core_si+0x4ff/0xf10\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerability lives in the TCP/DCCP connection-request path and is driven entirely by packets from a remote peer \u2014 a SYN arms the pinned reqsk timer, and a final ACK, RST, or crafted ICMP/ICMPv6 error races `inet_csk_reqsk_queue_drop()` against it. Any internet-facing listening TCP socket is reachable with no local access.\nAC:L - The attacker controls both sides of the race: it chooses when the timer is armed (SYN \u2192 `jiffies + TCP_TIMEOUT_INIT`, 1 s) and when the drop executes (ACK/RST/ICMP at t\u22481 s), and can run thousands of connections in parallel to hit the window reliably. The `TIMER_PINNED` same-CPU argument is defeated by attacker-chosen droppers that run on a different CPU \u2014 ICMP errors via `tcp_req_err()`, plus `tcp_abort()` and `inet_twsk_purge()` in process/workqueue context.\nPR:N - The entire path is pre-authentication TCP three-way-handshake and ICMP error handling in the kernel network stack, executed before any application-level credential check. An unauthenticated remote host merely needs to connect to a listening port.\nUI:N - No victim action is required; the server\u0027s ordinary `accept()`/`close()` lifecycle completes the scenario, and the ICMP and RST droppers need no local activity at all.\nS:U - The corruption is confined to kernel memory within the same security authority \u2014 freed socket objects and listener accept-queue accounting. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed 2376-byte `struct tcp_sock` (KFENCE-confirmed); `bpf_sk_storage_get()` reads `sk-\u003esk_state` and follows the stale `sk-\u003esk_bpf_storage` pointer, returning `sdata-\u003edata` to the caller. An attacker who grooms the reallocated slab object turns that into an arbitrary kernel read primitive.\nI:H - The same UAF yields a write primitive \u2014 with `BPF_SK_STORAGE_GET_F_CREATE` the helper performs `refcount_inc_not_zero(\u0026sk-\u003esk_refcnt)` and `bpf_local_storage_update()` against the freed/reallocated object, and per CVSS kernel guidance a use-after-free is treated as exploitable for control-flow hijacking. Independently, the double `atomic_dec(\u0026queue-\u003eyoung)` persistently corrupts the listener\u0027s SYN-queue accounting.\nA:H - Dereferencing the freed socket oopses or panics the kernel, and the condition is remotely repeatable across many connections. Even without a crash, each hijacked request floods SYN+ACK retransmissions for ~63 s and the underflowed `young` counter permanently clamps `max_syn_ack_retries` to 2, degrading the listener for its remaining lifetime."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:42:07.102Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/106e457953315e476b3642ef24be25ed862aaba3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c964bf65f80a14288d767023a1b300b30f5b9cd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8459d61fbf24967839a70235165673148c7c7f17"
        },
        {
          "url": "https://git.kernel.org/stable/c/5071beb59ee416e8ab456ac8647a4dabcda823b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/997ae8da14f1639ce6fb66a063dab54031cd61b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/51e34db64f4e43c7b055ccf881b7f3e0c31bb26d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8c526f2bdf1845bedaf6a478816a3d06fa78b8f"
        }
      ],
      "title": "tcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50154",
    "datePublished": "2024-11-07T09:31:30.855Z",
    "dateReserved": "2024-10-21T19:36:19.960Z",
    "dateUpdated": "2026-08-05T11:42:07.102Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-50154",
      "date": "2026-08-09",
      "epss": "0.00554",
      "percentile": "0.43193"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.1.11\", \"versionEndExcluding\": \"4.2\", \"matchCriteriaId\": \"3CD6E092-00BA-470A-BD6E-9FF38E84DB99\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.2\", \"versionEndExcluding\": \"5.15.170\", \"matchCriteriaId\": \"D37DEB92-5329-47EC-94B1-051761C1F534\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.16\", \"versionEndExcluding\": \"6.1.115\", \"matchCriteriaId\": \"C08A77A6-E42E-4EFD-B5A1-2BF6CBBB42AE\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.2\", \"versionEndExcluding\": \"6.6.59\", \"matchCriteriaId\": \"5D15CA59-D15C-4ACD-8B03-A072DEAD2081\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.7\", \"versionEndExcluding\": \"6.11.6\", \"matchCriteriaId\": \"E4486B12-007B-4794-9857-F07145637AA1\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"7F361E1D-580F-4A2D-A509-7615F73167A1\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\", \"matchCriteriaId\": \"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\", \"matchCriteriaId\": \"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\\n\\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\\n\\n  \\\"\\\"\\\"\\n  We are seeing a use-after-free from a bpf prog attached to\\n  trace_tcp_retransmit_synack. The program passes the req-\u003esk to the\\n  bpf_sk_storage_get_tracing kernel helper which does check for null\\n  before using it.\\n  \\\"\\\"\\\"\\n\\nThe commit 83fccfc3940c (\\\"inet: fix potential deadlock in\\nreqsk_queue_unlink()\\\") added timer_pending() in reqsk_queue_unlink() not\\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\\nsmall race window.\\n\\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\\nto clear timer-\u003eentry.pprev and marks it as not pending.\\n\\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\\ncontinue running and send multiple SYN+ACKs until it expires.\\n\\nThe reported UAF could happen if req-\u003esk is close()d earlier than the timer\\nexpiration, which is 63s by default.\\n\\nThe scenario would be\\n\\n  1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\\n     but del_timer_sync() is missed\\n\\n  2. reqsk timer is executed and scheduled again\\n\\n  3. req-\u003esk is accept()ed and reqsk_put() decrements rsk_refcnt, but\\n     reqsk timer still has another one, and inet_csk_accept() does not\\n     clear req-\u003esk for non-TFO sockets\\n\\n  4. sk is close()d\\n\\n  5. reqsk timer is executed again, and BPF touches req-\u003esk\\n\\nLet\u0027s not use timer_pending() by passing the caller context to\\n__inet_csk_reqsk_queue_drop().\\n\\nNote that reqsk timer is pinned, so the issue does not happen in most\\nuse cases. [1]\\n\\n[0]\\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\\n\\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\\nbpf_sk_storage_get_tracing+0x2e/0x1b0\\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\\nbpf_trace_run2+0x4c/0xc0\\ntcp_rtx_synack+0xf9/0x100\\nreqsk_timer_handler+0xda/0x3d0\\nrun_timer_softirq+0x292/0x8a0\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\nintel_idle_irq+0x5a/0xa0\\ncpuidle_enter_state+0x94/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\\n\\nallocated by task 0 on cpu 9 at 260507.901592s:\\nsk_prot_alloc+0x35/0x140\\nsk_clone_lock+0x1f/0x3f0\\ninet_csk_clone_lock+0x15/0x160\\ntcp_create_openreq_child+0x1f/0x410\\ntcp_v6_syn_recv_sock+0x1da/0x700\\ntcp_check_req+0x1fb/0x510\\ntcp_v6_rcv+0x98b/0x1420\\nipv6_list_rcv+0x2258/0x26e0\\nnapi_complete_done+0x5b1/0x2990\\nmlx5e_napi_poll+0x2ae/0x8d0\\nnet_rx_action+0x13e/0x590\\nirq_exit_rcu+0xf5/0x320\\ncommon_interrupt+0x80/0x90\\nasm_common_interrupt+0x22/0x40\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nfreed by task 0 on cpu 9 at 260507.927527s:\\nrcu_core_si+0x4ff/0xf10\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp/dccp: No use timer_pending() en reqsk_queue_unlink(). Martin KaFai Lau inform\\u00f3 de un use-after-free [0] en reqsk_timer_handler(). \\\"\\\"\\\" Estamos viendo un use-after-free de un programa bpf adjunto a trace_tcp_retransmit_synack. El programa pasa el req-\u0026gt;sk al ayudante del kernel bpf_sk_storage_get_tracing que comprueba si hay valores nulos antes de usarlo. \\\"\\\"\\\" El commit 83fccfc3940c (\\\"inet: soluciona un posible bloqueo en reqsk_queue_unlink()\\\") agreg\\u00f3 timer_pending() en reqsk_queue_unlink() para no llamar a del_timer_sync() desde reqsk_timer_handler(), pero introdujo una peque\\u00f1a ventana de ejecuci\\u00f3n. Antes de que se llame al temporizador, expire_timers() llama a detach_timer(timer, true) para borrar timer-\u0026gt;entry.pprev y lo marca como no pendiente. Si reqsk_queue_unlink() comprueba timer_pending() justo despu\\u00e9s de que expire_timers() llame a detach_timer(), TCP no detectar\\u00e1 del_timer_sync(); el temporizador reqsk seguir\\u00e1 funcionando y enviar\\u00e1 varios SYN+ACK hasta que expire. El UAF informado podr\\u00eda ocurrir si se cierra req-\u0026gt;sk antes de la expiraci\\u00f3n del temporizador, que es 63 s por defecto. El escenario ser\\u00eda 1. inet_csk_complete_hashdance() llama a inet_csk_reqsk_queue_drop(), pero se omite del_timer_sync() 2. se ejecuta el temporizador reqsk y se programa nuevamente 3. se acepta req-\u0026gt;sk y reqsk_put() decrementa rsk_refcnt, pero el temporizador reqsk a\\u00fan tiene otro, e inet_csk_accept() no borra req-\u0026gt;sk para sockets que no sean TFO 4. se cierra sk 5. se ejecuta nuevamente el temporizador reqsk y BPF toca req-\u0026gt;sk No usemos timer_pending() pasando el contexto del llamador a __inet_csk_reqsk_queue_drop(). Tenga en cuenta que el temporizador reqsk est\\u00e1 fijado, por lo que el problema no ocurre en la mayor\\u00eda de los casos de uso. [1] [0] ERROR: KFENCE: lectura de use-after-free en bpf_sk_storage_get_tracing+0x2e/0x1b0 Lectura de use-after-free en 0x00000000a891fb3a (en kfence-#1): bpf_sk_storage_get_tracing+0x2e/0x1b0 bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda bpf_trace_run2+0x4c/0xc0 tcp_rtx_synack+0xf9/0x100 reqsk_timer_handler+0xda/0x3d0 run_timer_softirq+0x292/0x8a0 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 intel_idle_irq+0x5a/0xa0 cpuidle_enter_state+0x94/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, tama\\u00f1o=2376, cach\\u00e9=TCPv6 asignado por la tarea 0 en la CPU 9 en 260507.901592s: sk_prot_alloc+0x35/0x140 sk_clone_lock+0x1f/0x3f0 inet_csk_clone_lock+0x15/0x160 tcp_create_openreq_child+0x1f/0x410 tcp_v6_syn_recv_sock+0x1da/0x700 tcp_check_req+0x1fb/0x510 tcp_v6_rcv+0x98b/0x1420 ipv6_list_rcv+0x2258/0x26e0 napi_complete_done+0x5b1/0x2990 mlx5e_napi_poll+0x2ae/0x8d0 net_rx_action+0x13e/0x590 irq_exit_rcu+0xf5/0x320 common_interrupt+0x80/0x90 asm_common_interrupt+0x22/0x40 cpuidle_enter_state+0xfb/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb liberado por la tarea 0 en la CPU 9 a las 260507.927527 s: rcu_core_si+0x4ff/0xf10 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 cpu_idle_entrada_estado+0xfb/0x273 cpu_inicio_entrada+0x15e/0x260 inicio_secundario+0x8a/0x90 inicio_secundario_64_sin_verificaci\\u00f3n+0xfa/0xfb\"}]",
      "id": "CVE-2024-50154",
      "lastModified": "2024-12-11T15:15:13.367",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.0, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.0, \"impactScore\": 5.9}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-11-07T10:15:06.987",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/5071beb59ee416e8ab456ac8647a4dabcda823b1\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/51e34db64f4e43c7b055ccf881b7f3e0c31bb26d\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/8459d61fbf24967839a70235165673148c7c7f17\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/997ae8da14f1639ce6fb66a063dab54031cd61b3\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/e8c526f2bdf1845bedaf6a478816a3d06fa78b8f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T14:09:20.000Z",
      "cve": "CVE-2024-50154",
      "id": "msrc_CVE-2024-50154",
      "initial_release_date": "2024-11-02T00:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-50154.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50154\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-07T10:15:06.987\",\"lastModified\":\"2026-08-04T11:21:26.317\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\\n\\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\\n\\n  \\\"\\\"\\\"\\n  We are seeing a use-after-free from a bpf prog attached to\\n  trace_tcp_retransmit_synack. The program passes the req-\u003esk to the\\n  bpf_sk_storage_get_tracing kernel helper which does check for null\\n  before using it.\\n  \\\"\\\"\\\"\\n\\nThe commit 83fccfc3940c (\\\"inet: fix potential deadlock in\\nreqsk_queue_unlink()\\\") added timer_pending() in reqsk_queue_unlink() not\\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\\nsmall race window.\\n\\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\\nto clear timer-\u003eentry.pprev and marks it as not pending.\\n\\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\\ncontinue running and send multiple SYN+ACKs until it expires.\\n\\nThe reported UAF could happen if req-\u003esk is close()d earlier than the timer\\nexpiration, which is 63s by default.\\n\\nThe scenario would be\\n\\n  1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\\n     but del_timer_sync() is missed\\n\\n  2. reqsk timer is executed and scheduled again\\n\\n  3. req-\u003esk is accept()ed and reqsk_put() decrements rsk_refcnt, but\\n     reqsk timer still has another one, and inet_csk_accept() does not\\n     clear req-\u003esk for non-TFO sockets\\n\\n  4. sk is close()d\\n\\n  5. reqsk timer is executed again, and BPF touches req-\u003esk\\n\\nLet\u0027s not use timer_pending() by passing the caller context to\\n__inet_csk_reqsk_queue_drop().\\n\\nNote that reqsk timer is pinned, so the issue does not happen in most\\nuse cases. [1]\\n\\n[0]\\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\\n\\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\\nbpf_sk_storage_get_tracing+0x2e/0x1b0\\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\\nbpf_trace_run2+0x4c/0xc0\\ntcp_rtx_synack+0xf9/0x100\\nreqsk_timer_handler+0xda/0x3d0\\nrun_timer_softirq+0x292/0x8a0\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\nintel_idle_irq+0x5a/0xa0\\ncpuidle_enter_state+0x94/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\\n\\nallocated by task 0 on cpu 9 at 260507.901592s:\\nsk_prot_alloc+0x35/0x140\\nsk_clone_lock+0x1f/0x3f0\\ninet_csk_clone_lock+0x15/0x160\\ntcp_create_openreq_child+0x1f/0x410\\ntcp_v6_syn_recv_sock+0x1da/0x700\\ntcp_check_req+0x1fb/0x510\\ntcp_v6_rcv+0x98b/0x1420\\nipv6_list_rcv+0x2258/0x26e0\\nnapi_complete_done+0x5b1/0x2990\\nmlx5e_napi_poll+0x2ae/0x8d0\\nnet_rx_action+0x13e/0x590\\nirq_exit_rcu+0xf5/0x320\\ncommon_interrupt+0x80/0x90\\nasm_common_interrupt+0x22/0x40\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nfreed by task 0 on cpu 9 at 260507.927527s:\\nrcu_core_si+0x4ff/0xf10\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp/dccp: No use timer_pending() en reqsk_queue_unlink(). Martin KaFai Lau inform\u00f3 de un use-after-free [0] en reqsk_timer_handler(). \\\"\\\"\\\" Estamos viendo un use-after-free de un programa bpf adjunto a trace_tcp_retransmit_synack. El programa pasa el req-\u0026gt;sk al ayudante del kernel bpf_sk_storage_get_tracing que comprueba si hay valores nulos antes de usarlo. \\\"\\\"\\\" El commit 83fccfc3940c (\\\"inet: soluciona un posible bloqueo en reqsk_queue_unlink()\\\") agreg\u00f3 timer_pending() en reqsk_queue_unlink() para no llamar a del_timer_sync() desde reqsk_timer_handler(), pero introdujo una peque\u00f1a ventana de ejecuci\u00f3n. Antes de que se llame al temporizador, expire_timers() llama a detach_timer(timer, true) para borrar timer-\u0026gt;entry.pprev y lo marca como no pendiente. Si reqsk_queue_unlink() comprueba timer_pending() justo despu\u00e9s de que expire_timers() llame a detach_timer(), TCP no detectar\u00e1 del_timer_sync(); el temporizador reqsk seguir\u00e1 funcionando y enviar\u00e1 varios SYN+ACK hasta que expire. El UAF informado podr\u00eda ocurrir si se cierra req-\u0026gt;sk antes de la expiraci\u00f3n del temporizador, que es 63 s por defecto. El escenario ser\u00eda 1. inet_csk_complete_hashdance() llama a inet_csk_reqsk_queue_drop(), pero se omite del_timer_sync() 2. se ejecuta el temporizador reqsk y se programa nuevamente 3. se acepta req-\u0026gt;sk y reqsk_put() decrementa rsk_refcnt, pero el temporizador reqsk a\u00fan tiene otro, e inet_csk_accept() no borra req-\u0026gt;sk para sockets que no sean TFO 4. se cierra sk 5. se ejecuta nuevamente el temporizador reqsk y BPF toca req-\u0026gt;sk No usemos timer_pending() pasando el contexto del llamador a __inet_csk_reqsk_queue_drop(). Tenga en cuenta que el temporizador reqsk est\u00e1 fijado, por lo que el problema no ocurre en la mayor\u00eda de los casos de uso. [1] [0] ERROR: KFENCE: lectura de use-after-free en bpf_sk_storage_get_tracing+0x2e/0x1b0 Lectura de use-after-free en 0x00000000a891fb3a (en kfence-#1): bpf_sk_storage_get_tracing+0x2e/0x1b0 bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda bpf_trace_run2+0x4c/0xc0 tcp_rtx_synack+0xf9/0x100 reqsk_timer_handler+0xda/0x3d0 run_timer_softirq+0x292/0x8a0 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 intel_idle_irq+0x5a/0xa0 cpuidle_enter_state+0x94/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, tama\u00f1o=2376, cach\u00e9=TCPv6 asignado por la tarea 0 en la CPU 9 en 260507.901592s: sk_prot_alloc+0x35/0x140 sk_clone_lock+0x1f/0x3f0 inet_csk_clone_lock+0x15/0x160 tcp_create_openreq_child+0x1f/0x410 tcp_v6_syn_recv_sock+0x1da/0x700 tcp_check_req+0x1fb/0x510 tcp_v6_rcv+0x98b/0x1420 ipv6_list_rcv+0x2258/0x26e0 napi_complete_done+0x5b1/0x2990 mlx5e_napi_poll+0x2ae/0x8d0 net_rx_action+0x13e/0x590 irq_exit_rcu+0xf5/0x320 common_interrupt+0x80/0x90 asm_common_interrupt+0x22/0x40 cpuidle_enter_state+0xfb/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb liberado por la tarea 0 en la CPU 9 a las 260507.927527 s: rcu_core_si+0x4ff/0xf10 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 cpu_idle_entrada_estado+0xfb/0x273 cpu_inicio_entrada+0x15e/0x260 inicio_secundario+0x8a/0x90 inicio_secundario_64_sin_verificaci\u00f3n+0xfa/0xfb\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/inet_connection_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"106e457953315e476b3642ef24be25ed862aaba3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"c964bf65f80a14288d767023a1b300b30f5b9cd0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"8459d61fbf24967839a70235165673148c7c7f17\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"5071beb59ee416e8ab456ac8647a4dabcda823b1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"997ae8da14f1639ce6fb66a063dab54031cd61b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"51e34db64f4e43c7b055ccf881b7f3e0c31bb26d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\",\"lessThan\":\"e8c526f2bdf1845bedaf6a478816a3d06fa78b8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d3a1196bfc462943694623412d8e03aaf172bdc1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.1.11\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/inet_connection_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.293\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.237\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.170\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.115\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.59\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.6\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-12-11T14:25:48.087506Z\",\"id\":\"CVE-2024-50154\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.1.11\",\"versionEndExcluding\":\"4.2\",\"matchCriteriaId\":\"3CD6E092-00BA-470A-BD6E-9FF38E84DB99\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.2\",\"versionEndExcluding\":\"5.15.170\",\"matchCriteriaId\":\"D37DEB92-5329-47EC-94B1-051761C1F534\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.115\",\"matchCriteriaId\":\"C08A77A6-E42E-4EFD-B5A1-2BF6CBBB42AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.59\",\"matchCriteriaId\":\"5D15CA59-D15C-4ACD-8B03-A072DEAD2081\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.6\",\"matchCriteriaId\":\"E4486B12-007B-4794-9857-F07145637AA1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/106e457953315e476b3642ef24be25ed862aaba3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5071beb59ee416e8ab456ac8647a4dabcda823b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/51e34db64f4e43c7b055ccf881b7f3e0c31bb26d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8459d61fbf24967839a70235165673148c7c7f17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/997ae8da14f1639ce6fb66a063dab54031cd61b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c964bf65f80a14288d767023a1b300b30f5b9cd0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8c526f2bdf1845bedaf6a478816a3d06fa78b8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T17:48:13+00:00",
      "cve": "CVE-2024-50154",
      "id": "CVE-2024-50154",
      "initial_release_date": "2024-11-07T00:00:00+00:00",
      "product_status:fixed": "709",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tcp/dccp: Don\u0026#39;t use timer_pending() in reqsk_queue_unlink().",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50154.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T01:27:30Z",
      "cve": "CVE-2024-50154",
      "id": "CVE-2024-50154",
      "initial_release_date": "2024-11-08T03:49:00Z",
      "product_status:known_affected": "445",
      "product_status:known_not_affected": "42",
      "product_status:recommended": "1021",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-50154",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-50154.json",
      "version": "93"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:26:13.271Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50154\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-11T14:25:48.087506Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-12-11T14:25:49.409Z\"}}], \"cna\": {\"title\": \"tcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"106e457953315e476b3642ef24be25ed862aaba3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"c964bf65f80a14288d767023a1b300b30f5b9cd0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"8459d61fbf24967839a70235165673148c7c7f17\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"5071beb59ee416e8ab456ac8647a4dabcda823b1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"997ae8da14f1639ce6fb66a063dab54031cd61b3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"51e34db64f4e43c7b055ccf881b7f3e0c31bb26d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83fccfc3940c4a2db90fd7e7079f5b465cd8c6af\", \"lessThan\": \"e8c526f2bdf1845bedaf6a478816a3d06fa78b8f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d3a1196bfc462943694623412d8e03aaf172bdc1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.1.11\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.293\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.237\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.170\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.115\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.59\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/106e457953315e476b3642ef24be25ed862aaba3\"}, {\"url\": \"https://git.kernel.org/stable/c/c964bf65f80a14288d767023a1b300b30f5b9cd0\"}, {\"url\": \"https://git.kernel.org/stable/c/8459d61fbf24967839a70235165673148c7c7f17\"}, {\"url\": \"https://git.kernel.org/stable/c/5071beb59ee416e8ab456ac8647a4dabcda823b1\"}, {\"url\": \"https://git.kernel.org/stable/c/997ae8da14f1639ce6fb66a063dab54031cd61b3\"}, {\"url\": \"https://git.kernel.org/stable/c/51e34db64f4e43c7b055ccf881b7f3e0c31bb26d\"}, {\"url\": \"https://git.kernel.org/stable/c/e8c526f2bdf1845bedaf6a478816a3d06fa78b8f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\\n\\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\\n\\n  \\\"\\\"\\\"\\n  We are seeing a use-after-free from a bpf prog attached to\\n  trace_tcp_retransmit_synack. The program passes the req-\u003esk to the\\n  bpf_sk_storage_get_tracing kernel helper which does check for null\\n  before using it.\\n  \\\"\\\"\\\"\\n\\nThe commit 83fccfc3940c (\\\"inet: fix potential deadlock in\\nreqsk_queue_unlink()\\\") added timer_pending() in reqsk_queue_unlink() not\\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\\nsmall race window.\\n\\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\\nto clear timer-\u003eentry.pprev and marks it as not pending.\\n\\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\\ncontinue running and send multiple SYN+ACKs until it expires.\\n\\nThe reported UAF could happen if req-\u003esk is close()d earlier than the timer\\nexpiration, which is 63s by default.\\n\\nThe scenario would be\\n\\n  1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\\n     but del_timer_sync() is missed\\n\\n  2. reqsk timer is executed and scheduled again\\n\\n  3. req-\u003esk is accept()ed and reqsk_put() decrements rsk_refcnt, but\\n     reqsk timer still has another one, and inet_csk_accept() does not\\n     clear req-\u003esk for non-TFO sockets\\n\\n  4. sk is close()d\\n\\n  5. reqsk timer is executed again, and BPF touches req-\u003esk\\n\\nLet\u0027s not use timer_pending() by passing the caller context to\\n__inet_csk_reqsk_queue_drop().\\n\\nNote that reqsk timer is pinned, so the issue does not happen in most\\nuse cases. [1]\\n\\n[0]\\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\\n\\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\\nbpf_sk_storage_get_tracing+0x2e/0x1b0\\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\\nbpf_trace_run2+0x4c/0xc0\\ntcp_rtx_synack+0xf9/0x100\\nreqsk_timer_handler+0xda/0x3d0\\nrun_timer_softirq+0x292/0x8a0\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\nintel_idle_irq+0x5a/0xa0\\ncpuidle_enter_state+0x94/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\\n\\nallocated by task 0 on cpu 9 at 260507.901592s:\\nsk_prot_alloc+0x35/0x140\\nsk_clone_lock+0x1f/0x3f0\\ninet_csk_clone_lock+0x15/0x160\\ntcp_create_openreq_child+0x1f/0x410\\ntcp_v6_syn_recv_sock+0x1da/0x700\\ntcp_check_req+0x1fb/0x510\\ntcp_v6_rcv+0x98b/0x1420\\nipv6_list_rcv+0x2258/0x26e0\\nnapi_complete_done+0x5b1/0x2990\\nmlx5e_napi_poll+0x2ae/0x8d0\\nnet_rx_action+0x13e/0x590\\nirq_exit_rcu+0xf5/0x320\\ncommon_interrupt+0x80/0x90\\nasm_common_interrupt+0x22/0x40\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\\n\\nfreed by task 0 on cpu 9 at 260507.927527s:\\nrcu_core_si+0x4ff/0xf10\\nirq_exit_rcu+0xf5/0x320\\nsysvec_apic_timer_interrupt+0x6d/0x80\\nasm_sysvec_apic_timer_interrupt+0x16/0x20\\ncpuidle_enter_state+0xfb/0x273\\ncpu_startup_entry+0x15e/0x260\\nstart_secondary+0x8a/0x90\\nsecondary_startup_64_no_verify+0xfa/0xfb\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.293\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.237\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.170\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.115\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.59\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.6\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.1.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:54:38.529Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50154\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:54:38.529Z\", \"dateReserved\": \"2024-10-21T19:36:19.960Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-07T09:31:30.855Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.