{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74257",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.877Z",
        "datePublished": "2026-08-15T05:57:35.604Z",
        "dateUpdated": "2026-08-17T05:45:06.481Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:45:06.481Z"
            },
            "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->ingress_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)->iolock.\n\nInitially, udp_bpf_recvmsg() had used lock_sock(), but the cited\ncommit removed it.\n\nLet's serialise sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg().\n\nNote that holding spin_lock_bh(&sk->sk_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 <TASK>\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 <48> 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 </TASK>\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": {
                        "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"
                    },
                    "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 ->recvmsg 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's 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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/udp_bpf.c"
                    ],
                    "versions": [
                        {
                            "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
                            "lessThan": "81567d2b3f4dc4fc32f8b61433738bce2cafd4a1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
                            "lessThan": "39d44ed6904bfa9a1c6d0538672dd50c7b85520e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9f2470fbc4cb4583c080bb729a998933ba61aca4",
                            "lessThan": "c010995b29c8939c6aa69e3cb26f8dbee163d156",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/udp_bpf.c"
                    ],
                    "versions": [
                        {
                            "version": "5.14",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.14",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.40",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.14",
                                    "versionEndExcluding": "6.18.40"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.14",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.14",
                                    "versionEndExcluding": "7.2"
                                }
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            ],
            "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()",
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}