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CVE-2026-53260 (GCVE-0-2026-53260)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req(). syzbot reported a weird reqsk->rsk_refcnt underflow in __inet_csk_reqsk_queue_drop(). The captured reqsk_put() in __inet_csk_reqsk_queue_drop() is called only when it successfully removes reqsk from ehash. Moreover, reqsk_timer_handler() calls another reqsk_put() after that. This indicates that the reqsk was missing both refcnts for ehash and the timer itself. Since all the syzbot reports had PREEMPT_RT enabled, the only possible scenario is that reqsk_queue_hash_req() is preempted after mod_timer() and before refcount_set(), and then the timer triggered after 1s aborts the reqsk due to its listener's close(). Let's wrap mod_timer() and refcount_set() with preempt_disable_nested() and preempt_enable_nested(). Note that inet_ehash_insert() holds the normal spin_lock() (mutex in PREEMPT_RT), so it must be called outside of preempt_disable_nested(), but this is fine. The lookup path just ignores 0 sk_refcnt entries in ehash and tries to create another reqsk, but this will fail at inet_ehash_insert(). [0]: refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28, CPU#0: ktimers/0/16 Modules linked in: CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28 Code: e4 7d d1 0a 67 48 0f b9 3a eb 4a e8 38 3d 23 fd 48 8d 3d e1 7d d1 0a 67 48 0f b9 3a eb 37 e8 25 3d 23 fd 48 8d 3d de 7d d1 0a <67> 48 0f b9 3a eb 24 e8 12 3d 23 fd 48 8d 3d db 7d d1 0a 67 48 0f RSP: 0000:ffffc90000157948 EFLAGS: 00010246 RAX: ffffffff84a1301b RBX: 0000000000000003 RCX: ffff88801ca98000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8f72ae00 RBP: ffffffff99ae3b01 R08: ffff88801ca98000 R09: 0000000000000005 R10: 0000000000000100 R11: 0000000000000004 R12: ffff8880425ef568 R13: ffff8880425ef4f8 R14: ffff8880425ef578 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888126386000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b46710e9c CR3: 000000000dbb6000 CR4: 00000000003526f0 Call Trace: <TASK> __refcount_sub_and_test include/linux/refcount.h:400 [inline] __refcount_dec_and_test include/linux/refcount.h:432 [inline] refcount_dec_and_test include/linux/refcount.h:450 [inline] reqsk_put include/net/request_sock.h:136 [inline] __inet_csk_reqsk_queue_drop+0x3ce/0x440 net/ipv4/inet_connection_sock.c:1007 reqsk_timer_handler+0x651/0xdf0 net/ipv4/inet_connection_sock.c:1137 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x6a3/0x9f0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0x67/0x170 kernel/time/timer.c:2403 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] run_ktimerd+0x69/0x100 kernel/softirq.c:1151 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK>
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d2d6422f8bd17c6bb205133e290625a564194496 , < 889fc99967007e2493833515a645cb2d800f6742 (git)
Affected: d2d6422f8bd17c6bb205133e290625a564194496 , < de5a46f3b2c8d3cd20afa158bd3a725e3e3d6fd3 (git)
Affected: d2d6422f8bd17c6bb205133e290625a564194496 , < b183215ff714efb747d9d5a429322ba6404b5401 (git)
Affected: d2d6422f8bd17c6bb205133e290625a564194496 , < e10902df24488ca722303133acfc82490f7d59ad (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/inet_connection_sock.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "e10902df24488ca722303133acfc82490f7d59ad",
              "status": "affected",
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/inet_connection_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().\n\nsyzbot reported a weird reqsk-\u003ersk_refcnt underflow in\n__inet_csk_reqsk_queue_drop().\n\nThe captured reqsk_put() in __inet_csk_reqsk_queue_drop()\nis called only when it successfully removes reqsk from ehash.\n\nMoreover, reqsk_timer_handler() calls another reqsk_put()\nafter that.\n\nThis indicates that the reqsk was missing both refcnts for\nehash and the timer itself.\n\nSince all the syzbot reports had PREEMPT_RT enabled, the only\npossible scenario is that reqsk_queue_hash_req() is preempted\nafter mod_timer() and before refcount_set(), and then the timer\ntriggered after 1s aborts the reqsk due to its listener\u0027s close().\n\nLet\u0027s wrap mod_timer() and refcount_set() with\npreempt_disable_nested() and preempt_enable_nested().\n\nNote that inet_ehash_insert() holds the normal spin_lock()\n(mutex in PREEMPT_RT), so it must be called outside of\npreempt_disable_nested(), but this is fine.\n\nThe lookup path just ignores 0 sk_refcnt entries in ehash\nand tries to create another reqsk, but this will fail at\ninet_ehash_insert().\n\n[0]:\nrefcount_t: underflow; use-after-free.\nWARNING: lib/refcount.c:28 at refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28, CPU#0: ktimers/0/16\nModules linked in:\nCPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026\nRIP: 0010:refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28\nCode: e4 7d d1 0a 67 48 0f b9 3a eb 4a e8 38 3d 23 fd 48 8d 3d e1 7d d1 0a 67 48 0f b9 3a eb 37 e8 25 3d 23 fd 48 8d 3d de 7d d1 0a \u003c67\u003e 48 0f b9 3a eb 24 e8 12 3d 23 fd 48 8d 3d db 7d d1 0a 67 48 0f\nRSP: 0000:ffffc90000157948 EFLAGS: 00010246\nRAX: ffffffff84a1301b RBX: 0000000000000003 RCX: ffff88801ca98000\nRDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8f72ae00\nRBP: ffffffff99ae3b01 R08: ffff88801ca98000 R09: 0000000000000005\nR10: 0000000000000100 R11: 0000000000000004 R12: ffff8880425ef568\nR13: ffff8880425ef4f8 R14: ffff8880425ef578 R15: 0000000000000000\nFS:  0000000000000000(0000) GS:ffff888126386000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f7b46710e9c CR3: 000000000dbb6000 CR4: 00000000003526f0\nCall Trace:\n \u003cTASK\u003e\n __refcount_sub_and_test include/linux/refcount.h:400 [inline]\n __refcount_dec_and_test include/linux/refcount.h:432 [inline]\n refcount_dec_and_test include/linux/refcount.h:450 [inline]\n reqsk_put include/net/request_sock.h:136 [inline]\n __inet_csk_reqsk_queue_drop+0x3ce/0x440 net/ipv4/inet_connection_sock.c:1007\n reqsk_timer_handler+0x651/0xdf0 net/ipv4/inet_connection_sock.c:1137\n call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748\n expire_timers kernel/time/timer.c:1799 [inline]\n __run_timers kernel/time/timer.c:2374 [inline]\n __run_timer_base+0x6a3/0x9f0 kernel/time/timer.c:2386\n run_timer_base kernel/time/timer.c:2395 [inline]\n run_timer_softirq+0x67/0x170 kernel/time/timer.c:2403\n handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622\n __do_softirq kernel/softirq.c:656 [inline]\n run_ktimerd+0x69/0x100 kernel/softirq.c:1151\n smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e"
        }
      ],
      "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 vulnerable TCP request-socket path is reached by unauthenticated IPv4 or IPv6 SYN packets delivered to a listening socket over the network. This occurs before any application-level authentication.\nAC:L - Although the bug is a PREEMPT_RT timing race, an attacker can repeatedly create request sockets and timer/drop races by driving TCP connection attempts; under the required higher-severity rule this is treated as attacker-controllable rather than an uncontrollable environmental condition.\nPR:N - No credentials, capabilities, or prior authentication are required to send SYN packets to an exposed TCP listener and reach `tcp_conn_request()` and `reqsk_queue_hash_req()`. The path is in the generic TCP receive stack.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an interactive action. Network traffic alone can exercise the vulnerable path on an affected listening service.\nS:U - The impact is within the kernel/network stack security authority on the same host. There is no VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The failure is explicitly reported as a refcount underflow/use-after-free in a kernel heap object. Per the required guidance, UAF-class lifetime corruption is scored as high confidentiality impact because it can potentially be shaped into memory disclosure.\nI:H - The corrupted request-socket lifetime can leave stale kernel objects reachable through ehash/timer paths. Per the required guidance, UAF-class kernel memory corruption is scored as high integrity impact because it may be exploitable for write or control-flow manipulation.\nA:H - The observed failure triggers a kernel refcount warning with use-after-free semantics in timer context and can destabilize networking or the kernel. Kernel warnings/oopses, hangs, or UAF-triggered crashes are high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:39.011Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/889fc99967007e2493833515a645cb2d800f6742"
        },
        {
          "url": "https://git.kernel.org/stable/c/de5a46f3b2c8d3cd20afa158bd3a725e3e3d6fd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/b183215ff714efb747d9d5a429322ba6404b5401"
        },
        {
          "url": "https://git.kernel.org/stable/c/e10902df24488ca722303133acfc82490f7d59ad"
        }
      ],
      "title": "tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53260",
    "datePublished": "2026-06-25T08:39:49.229Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-08-05T12:34:39.011Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53260",
      "date": "2026-09-16",
      "epss": "0.00369",
      "percentile": "0.3047"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53260\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:43.993\",\"lastModified\":\"2026-07-24T15:18:00.303\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().\\n\\nsyzbot reported a weird reqsk-\u003ersk_refcnt underflow in\\n__inet_csk_reqsk_queue_drop().\\n\\nThe captured reqsk_put() in __inet_csk_reqsk_queue_drop()\\nis called only when it successfully removes reqsk from ehash.\\n\\nMoreover, reqsk_timer_handler() calls another reqsk_put()\\nafter that.\\n\\nThis indicates that the reqsk was missing both refcnts for\\nehash and the timer itself.\\n\\nSince all the syzbot reports had PREEMPT_RT enabled, the only\\npossible scenario is that reqsk_queue_hash_req() is preempted\\nafter mod_timer() and before refcount_set(), and then the timer\\ntriggered after 1s aborts the reqsk due to its listener\u0027s close().\\n\\nLet\u0027s wrap mod_timer() and refcount_set() with\\npreempt_disable_nested() and preempt_enable_nested().\\n\\nNote that inet_ehash_insert() holds the normal spin_lock()\\n(mutex in PREEMPT_RT), so it must be called outside of\\npreempt_disable_nested(), but this is fine.\\n\\nThe lookup path just ignores 0 sk_refcnt entries in ehash\\nand tries to create another reqsk, but this will fail at\\ninet_ehash_insert().\\n\\n[0]:\\nrefcount_t: underflow; use-after-free.\\nWARNING: lib/refcount.c:28 at refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28, CPU#0: ktimers/0/16\\nModules linked in:\\nCPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}\\nTainted: [L]=SOFTLOCKUP\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026\\nRIP: 0010:refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28\\nCode: e4 7d d1 0a 67 48 0f b9 3a eb 4a e8 38 3d 23 fd 48 8d 3d e1 7d d1 0a 67 48 0f b9 3a eb 37 e8 25 3d 23 fd 48 8d 3d de 7d d1 0a \u003c67\u003e 48 0f b9 3a eb 24 e8 12 3d 23 fd 48 8d 3d db 7d d1 0a 67 48 0f\\nRSP: 0000:ffffc90000157948 EFLAGS: 00010246\\nRAX: ffffffff84a1301b RBX: 0000000000000003 RCX: ffff88801ca98000\\nRDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8f72ae00\\nRBP: ffffffff99ae3b01 R08: ffff88801ca98000 R09: 0000000000000005\\nR10: 0000000000000100 R11: 0000000000000004 R12: ffff8880425ef568\\nR13: ffff8880425ef4f8 R14: ffff8880425ef578 R15: 0000000000000000\\nFS:  0000000000000000(0000) GS:ffff888126386000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007f7b46710e9c CR3: 000000000dbb6000 CR4: 00000000003526f0\\nCall Trace:\\n \u003cTASK\u003e\\n __refcount_sub_and_test include/linux/refcount.h:400 [inline]\\n __refcount_dec_and_test include/linux/refcount.h:432 [inline]\\n refcount_dec_and_test include/linux/refcount.h:450 [inline]\\n reqsk_put include/net/request_sock.h:136 [inline]\\n __inet_csk_reqsk_queue_drop+0x3ce/0x440 net/ipv4/inet_connection_sock.c:1007\\n reqsk_timer_handler+0x651/0xdf0 net/ipv4/inet_connection_sock.c:1137\\n call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748\\n expire_timers kernel/time/timer.c:1799 [inline]\\n __run_timers kernel/time/timer.c:2374 [inline]\\n __run_timer_base+0x6a3/0x9f0 kernel/time/timer.c:2386\\n run_timer_base kernel/time/timer.c:2395 [inline]\\n run_timer_softirq+0x67/0x170 kernel/time/timer.c:2403\\n handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622\\n __do_softirq kernel/softirq.c:656 [inline]\\n run_ktimerd+0x69/0x100 kernel/softirq.c:1151\\n smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160\\n kthread+0x388/0x470 kernel/kthread.c:436\\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\\n \u003c/TASK\u003e\"}],\"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\":\"d2d6422f8bd17c6bb205133e290625a564194496\",\"lessThan\":\"889fc99967007e2493833515a645cb2d800f6742\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d2d6422f8bd17c6bb205133e290625a564194496\",\"lessThan\":\"de5a46f3b2c8d3cd20afa158bd3a725e3e3d6fd3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d2d6422f8bd17c6bb205133e290625a564194496\",\"lessThan\":\"b183215ff714efb747d9d5a429322ba6404b5401\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d2d6422f8bd17c6bb205133e290625a564194496\",\"lessThan\":\"e10902df24488ca722303133acfc82490f7d59ad\",\"versionType\":\"git\",\"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\":\"6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"7.0.13\",\"matchCriteriaId\":\"5F7CA1CD-70DF-41F4-8C32-AFEA390C118F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"EC732D08-5F7B-46D9-B154-E60C7F4F0A97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E5910A9D-F60A-409A-B486-FE66BFEBA9B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"81DFF19E-9CF8-49C6-8C36-1E4038622933\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"B0E8FC71-3952-444C-83E9-718DBBBEC615\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/889fc99967007e2493833515a645cb2d800f6742\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b183215ff714efb747d9d5a429322ba6404b5401\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/de5a46f3b2c8d3cd20afa158bd3a725e3e3d6fd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e10902df24488ca722303133acfc82490f7d59ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T16:50:19+00:00",
      "cve": "CVE-2026-53260",
      "id": "CVE-2026-53260",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Race condition in TCP leads to use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53260.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T02:02:10Z",
      "cve": "CVE-2026-53260",
      "id": "CVE-2026-53260",
      "initial_release_date": "2026-06-26T02:08:18Z",
      "product_status:first_fixed": "167",
      "product_status:known_affected": "439",
      "product_status:known_not_affected": "213",
      "product_status:recommended": "348",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53260",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53260.json",
      "version": "17"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.