CVE-2026-74257 (GCVE-0-2026-74257)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:45
VLAI
Title
sockmap: Fix use-after-free in udp_bpf_recvmsg()
Summary
In the Linux kernel, the following vulnerability has been resolved: sockmap: Fix use-after-free in udp_bpf_recvmsg() syzbot reported use-after-free of struct sk_msg in sk_msg_recvmsg(). [0] sk_msg_recvmsg() peeks sk_msg from psock->ingress_msg under a lock, but its processing is lockless. Thus, sk_msg_recvmsg() must be serialised by callers, otherwise multiple threads could touch the same sk_msg. For example, TCP uses lock_sock(), and AF_UNIX uses unix_sk(sk)->iolock. Initially, udp_bpf_recvmsg() had used lock_sock(), but the cited commit removed it. Let's serialise sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg(). Note that holding spin_lock_bh(&sk->sk_receive_queue.lock) is not an option due to copy_page_to_iter() in sk_msg_recvmsg(). [0]: BUG: KASAN: slab-use-after-free in sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428 Read of size 4 at addr ffff88814cdcf000 by task syz.0.24/6020 CPU: 1 UID: 0 PID: 6020 Comm: syz.0.24 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428 udp_bpf_recvmsg+0x4bd/0xe00 net/ipv4/udp_bpf.c:84 inet_recvmsg+0x260/0x270 net/ipv4/af_inet.c:891 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x1a8/0x270 net/socket.c:1100 ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2812 ___sys_recvmsg+0x215/0x590 net/socket.c:2854 do_recvmmsg+0x334/0x800 net/socket.c:2949 __sys_recvmmsg net/socket.c:3023 [inline] __do_sys_recvmmsg net/socket.c:3046 [inline] __se_sys_recvmmsg net/socket.c:3039 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb319f9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb31ad97028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fb31a216090 RCX: 00007fb319f9aeb9 RDX: 0000000000000001 RSI: 0000200000000400 RDI: 0000000000000004 RBP: 00007fb31a008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000040000021 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb31a216128 R14: 00007fb31a216090 R15: 00007ffe21dd0a98 </TASK> Allocated by task 6019: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d1/0x6e0 mm/slub.c:5780 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] alloc_sk_msg net/core/skmsg.c:510 [inline] sk_psock_skb_ingress_self+0x60/0x350 net/core/skmsg.c:612 sk_psock_verdict_apply net/core/skmsg.c:1038 [inline] sk_psock_verdict_recv+0x7d9/0x8d0 net/core/skmsg.c:1236 udp_read_skb+0x73e/0x7e0 net/ipv4/udp.c:2045 sk_psock_verdict_data_ready+0x12d/0x550 net/core/skmsg.c:1257 __udp_enqueue_schedule_skb+0xc54/0x10b0 net/ipv4/udp.c:1789 __udp_queue_rcv_skb net/ipv4/udp.c:2346 [inline] udp_queue_rcv_one_skb+0xac5/0x19c0 net/ipv4/udp.c:2475 __udp4_lib_mcast_deliver+0xc06/0xcf0 net/ipv4/udp.c:2585 __udp4_lib_rcv+0x10f6/0x2620 net/ipv4/udp.c:2724 ip_protocol_deliver_rcu+0x282/0x440 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 dst_input include/net/dst.h:474 [inline] ip_sublist_rcv_finish+0x221/0x2a0 net/ipv4/ip_input.c:584 ip_list_rcv_finish net/ipv4/ip_inp ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9f2470fbc4cb4583c080bb729a998933ba61aca4 , < 81567d2b3f4dc4fc32f8b61433738bce2cafd4a1 (git)
Affected: 9f2470fbc4cb4583c080bb729a998933ba61aca4 , < 39d44ed6904bfa9a1c6d0538672dd50c7b85520e (git)
Affected: 9f2470fbc4cb4583c080bb729a998933ba61aca4 , < c010995b29c8939c6aa69e3cb26f8dbee163d156 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "81567d2b3f4dc4fc32f8b61433738bce2cafd4a1",
              "status": "affected",
              "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
              "versionType": "git"
            },
            {
              "lessThan": "39d44ed6904bfa9a1c6d0538672dd50c7b85520e",
              "status": "affected",
              "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
              "versionType": "git"
            },
            {
              "lessThan": "c010995b29c8939c6aa69e3cb26f8dbee163d156",
              "status": "affected",
              "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsockmap: Fix use-after-free in udp_bpf_recvmsg()\n\nsyzbot reported use-after-free of struct sk_msg in sk_msg_recvmsg(). [0]\n\nsk_msg_recvmsg() peeks sk_msg from psock-\u003eingress_msg under a lock,\nbut its processing is lockless.\n\nThus, sk_msg_recvmsg() must be serialised by callers, otherwise\nmultiple threads could touch the same sk_msg.\n\nFor example, TCP uses lock_sock(), and AF_UNIX uses unix_sk(sk)-\u003eiolock.\n\nInitially, udp_bpf_recvmsg() had used lock_sock(), but the cited\ncommit removed it.\n\nLet\u0027s serialise sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg().\n\nNote that holding spin_lock_bh(\u0026sk-\u003esk_receive_queue.lock) is not\nan option due to copy_page_to_iter() in sk_msg_recvmsg().\n\n[0]:\nBUG: KASAN: slab-use-after-free in sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428\nRead of size 4 at addr ffff88814cdcf000 by task syz.0.24/6020\n\nCPU: 1 UID: 0 PID: 6020 Comm: syz.0.24 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xba/0x230 mm/kasan/report.c:482\n kasan_report+0x117/0x150 mm/kasan/report.c:595\n sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428\n udp_bpf_recvmsg+0x4bd/0xe00 net/ipv4/udp_bpf.c:84\n inet_recvmsg+0x260/0x270 net/ipv4/af_inet.c:891\n sock_recvmsg_nosec net/socket.c:1078 [inline]\n sock_recvmsg+0x1a8/0x270 net/socket.c:1100\n ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2812\n ___sys_recvmsg+0x215/0x590 net/socket.c:2854\n do_recvmmsg+0x334/0x800 net/socket.c:2949\n __sys_recvmmsg net/socket.c:3023 [inline]\n __do_sys_recvmmsg net/socket.c:3046 [inline]\n __se_sys_recvmmsg net/socket.c:3039 [inline]\n __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fb319f9aeb9\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fb31ad97028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b\nRAX: ffffffffffffffda RBX: 00007fb31a216090 RCX: 00007fb319f9aeb9\nRDX: 0000000000000001 RSI: 0000200000000400 RDI: 0000000000000004\nRBP: 00007fb31a008c1f R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000040000021 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007fb31a216128 R14: 00007fb31a216090 R15: 00007ffe21dd0a98\n \u003c/TASK\u003e\n\nAllocated by task 6019:\n kasan_save_stack mm/kasan/common.c:57 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415\n kasan_kmalloc include/linux/kasan.h:263 [inline]\n __kmalloc_cache_noprof+0x3d1/0x6e0 mm/slub.c:5780\n kmalloc_noprof include/linux/slab.h:957 [inline]\n kzalloc_noprof include/linux/slab.h:1094 [inline]\n alloc_sk_msg net/core/skmsg.c:510 [inline]\n sk_psock_skb_ingress_self+0x60/0x350 net/core/skmsg.c:612\n sk_psock_verdict_apply net/core/skmsg.c:1038 [inline]\n sk_psock_verdict_recv+0x7d9/0x8d0 net/core/skmsg.c:1236\n udp_read_skb+0x73e/0x7e0 net/ipv4/udp.c:2045\n sk_psock_verdict_data_ready+0x12d/0x550 net/core/skmsg.c:1257\n __udp_enqueue_schedule_skb+0xc54/0x10b0 net/ipv4/udp.c:1789\n __udp_queue_rcv_skb net/ipv4/udp.c:2346 [inline]\n udp_queue_rcv_one_skb+0xac5/0x19c0 net/ipv4/udp.c:2475\n __udp4_lib_mcast_deliver+0xc06/0xcf0 net/ipv4/udp.c:2585\n __udp4_lib_rcv+0x10f6/0x2620 net/ipv4/udp.c:2724\n ip_protocol_deliver_rcu+0x282/0x440 net/ipv4/ip_input.c:207\n ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241\n NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318\n dst_input include/net/dst.h:474 [inline]\n ip_sublist_rcv_finish+0x221/0x2a0 net/ipv4/ip_input.c:584\n ip_list_rcv_finish net/ipv4/ip_inp\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is triggered in sk_msg_recvmsg() via concurrent local recvmsg/recvmmsg syscalls on a UDP socket whose -\u003erecvmsg was replaced by udp_bpf_recvmsg() after sockmap attachment; per kernel CNA BPF guidance this sockmap path is Local even though remote UDP can populate ingress_msg.\nAC:L - Syzkaller reproduced the bug with attacker-controlled concurrent recvmmsg on one socket; the attacker owns both racing threads and can reliably interleave sk_msg_recvmsg() reads with kfree_sk_msg() without conditions outside attacker control.\nPR:L - Creating BPF sockmap maps and SK_SKB verdict programs requires CAP_NET_ADMIN (obtainable in user namespaces), but once a socket is in the map any unprivileged local holder can trigger the race with ordinary recv syscalls without init-namespace root.\nUI:N - Exploitation requires only the attacker\u0027s own concurrent recv threads and traffic on the target socket; no independent action by another user or administrator is needed at trigger time.\nS:U - The use-after-free corrupts kernel sk_msg/slab and page state within the same kernel security authority; it does not cross VM, IOMMU, or sandbox boundaries by itself.\nC:H - KASAN reported slab-use-after-free on struct sk_msg scatterlist fields during copy_page_to_iter(); the freed sk_msg object can be reclaimed with attacker-controlled contents to read arbitrary kernel memory.\nI:H - Concurrent threads can double-free scatterlist pages and corrupt sk_msg queue linkage on a groomable slab object, yielding standard UAF write primitives usable for arbitrary kernel modification and privilege escalation.\nA:H - The published syzbot trace shows KASAN slab-use-after-free in sk_msg_recvmsg(); this UAF reliably corrupts kernel memory and can oops or panic the host even when full exploitation is not attempted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:06.481Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/81567d2b3f4dc4fc32f8b61433738bce2cafd4a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/39d44ed6904bfa9a1c6d0538672dd50c7b85520e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c010995b29c8939c6aa69e3cb26f8dbee163d156"
        }
      ],
      "title": "sockmap: Fix use-after-free in udp_bpf_recvmsg()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74257",
    "datePublished": "2026-08-15T05:57:35.604Z",
    "dateReserved": "2026-08-15T05:44:03.877Z",
    "dateUpdated": "2026-08-17T05:45:06.481Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74257",
      "date": "2026-08-21",
      "epss": "0.00124",
      "percentile": "0.0253"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74257\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:24.870\",\"lastModified\":\"2026-08-17T06:19:19.077\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsockmap: Fix use-after-free in udp_bpf_recvmsg()\\n\\nsyzbot reported use-after-free of struct sk_msg in sk_msg_recvmsg(). [0]\\n\\nsk_msg_recvmsg() peeks sk_msg from psock-\u003eingress_msg under a lock,\\nbut its processing is lockless.\\n\\nThus, sk_msg_recvmsg() must be serialised by callers, otherwise\\nmultiple threads could touch the same sk_msg.\\n\\nFor example, TCP uses lock_sock(), and AF_UNIX uses unix_sk(sk)-\u003eiolock.\\n\\nInitially, udp_bpf_recvmsg() had used lock_sock(), but the cited\\ncommit removed it.\\n\\nLet\u0027s serialise sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg().\\n\\nNote that holding spin_lock_bh(\u0026sk-\u003esk_receive_queue.lock) is not\\nan option due to copy_page_to_iter() in sk_msg_recvmsg().\\n\\n[0]:\\nBUG: KASAN: slab-use-after-free in sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428\\nRead of size 4 at addr ffff88814cdcf000 by task syz.0.24/6020\\n\\nCPU: 1 UID: 0 PID: 6020 Comm: syz.0.24 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0xba/0x230 mm/kasan/report.c:482\\n kasan_report+0x117/0x150 mm/kasan/report.c:595\\n sk_msg_recvmsg+0xb54/0xc30 net/core/skmsg.c:428\\n udp_bpf_recvmsg+0x4bd/0xe00 net/ipv4/udp_bpf.c:84\\n inet_recvmsg+0x260/0x270 net/ipv4/af_inet.c:891\\n sock_recvmsg_nosec net/socket.c:1078 [inline]\\n sock_recvmsg+0x1a8/0x270 net/socket.c:1100\\n ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2812\\n ___sys_recvmsg+0x215/0x590 net/socket.c:2854\\n do_recvmmsg+0x334/0x800 net/socket.c:2949\\n __sys_recvmmsg net/socket.c:3023 [inline]\\n __do_sys_recvmmsg net/socket.c:3046 [inline]\\n __se_sys_recvmmsg net/socket.c:3039 [inline]\\n __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7fb319f9aeb9\\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\\nRSP: 002b:00007fb31ad97028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b\\nRAX: ffffffffffffffda RBX: 00007fb31a216090 RCX: 00007fb319f9aeb9\\nRDX: 0000000000000001 RSI: 0000200000000400 RDI: 0000000000000004\\nRBP: 00007fb31a008c1f R08: 0000000000000000 R09: 0000000000000000\\nR10: 0000000040000021 R11: 0000000000000246 R12: 0000000000000000\\nR13: 00007fb31a216128 R14: 00007fb31a216090 R15: 00007ffe21dd0a98\\n \u003c/TASK\u003e\\n\\nAllocated by task 6019:\\n kasan_save_stack mm/kasan/common.c:57 [inline]\\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415\\n kasan_kmalloc include/linux/kasan.h:263 [inline]\\n __kmalloc_cache_noprof+0x3d1/0x6e0 mm/slub.c:5780\\n kmalloc_noprof include/linux/slab.h:957 [inline]\\n kzalloc_noprof include/linux/slab.h:1094 [inline]\\n alloc_sk_msg net/core/skmsg.c:510 [inline]\\n sk_psock_skb_ingress_self+0x60/0x350 net/core/skmsg.c:612\\n sk_psock_verdict_apply net/core/skmsg.c:1038 [inline]\\n sk_psock_verdict_recv+0x7d9/0x8d0 net/core/skmsg.c:1236\\n udp_read_skb+0x73e/0x7e0 net/ipv4/udp.c:2045\\n sk_psock_verdict_data_ready+0x12d/0x550 net/core/skmsg.c:1257\\n __udp_enqueue_schedule_skb+0xc54/0x10b0 net/ipv4/udp.c:1789\\n __udp_queue_rcv_skb net/ipv4/udp.c:2346 [inline]\\n udp_queue_rcv_one_skb+0xac5/0x19c0 net/ipv4/udp.c:2475\\n __udp4_lib_mcast_deliver+0xc06/0xcf0 net/ipv4/udp.c:2585\\n __udp4_lib_rcv+0x10f6/0x2620 net/ipv4/udp.c:2724\\n ip_protocol_deliver_rcu+0x282/0x440 net/ipv4/ip_input.c:207\\n ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241\\n NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318\\n dst_input include/net/dst.h:474 [inline]\\n ip_sublist_rcv_finish+0x221/0x2a0 net/ipv4/ip_input.c:584\\n ip_list_rcv_finish net/ipv4/ip_inp\\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/udp_bpf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9f2470fbc4cb4583c080bb729a998933ba61aca4\",\"lessThan\":\"81567d2b3f4dc4fc32f8b61433738bce2cafd4a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9f2470fbc4cb4583c080bb729a998933ba61aca4\",\"lessThan\":\"39d44ed6904bfa9a1c6d0538672dd50c7b85520e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9f2470fbc4cb4583c080bb729a998933ba61aca4\",\"lessThan\":\"c010995b29c8939c6aa69e3cb26f8dbee163d156\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/udp_bpf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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: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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/39d44ed6904bfa9a1c6d0538672dd50c7b85520e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81567d2b3f4dc4fc32f8b61433738bce2cafd4a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c010995b29c8939c6aa69e3cb26f8dbee163d156\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T19:39:24+00:00",
      "cve": "CVE-2026-74257",
      "id": "CVE-2026-74257",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sockmap: Fix use-after-free in udp_bpf_recvmsg()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74257.json",
      "version": "3"
    }
  }
}



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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.