{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43016",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43016"
  ],
  "published": "2026-05-01T14:17:31Z",
  "summary": "bpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready().",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready().\n\nsyzbot reported use-after-free of AF_UNIX socket's sk->sk_socket\nin sk_psock_verdict_data_ready(). [0]\n\nIn unix_stream_sendmsg(), the peer socket's ->sk_data_ready() is\ncalled after dropping its unix_state_lock().\n\nAlthough the sender socket holds the peer's refcount, it does not\nprevent the peer's sock_orphan(), and the peer's sk_socket might\nbe freed after one RCU grace period.\n\nLet's fetch the peer's sk->sk_socket and sk->sk_socket->ops under\nRCU in sk_psock_verdict_data_ready().\n\n[0]:\nBUG: KASAN: slab-use-after-free in sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278\nRead of size 8 at addr ffff8880594da860 by task syz.4.1842/11013\n\nCPU: 1 UID: 0 PID: 11013 Comm: syz.4.1842 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026\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_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278\n unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2482\n sock_sendmsg_nosec net/socket.c:721 [inline]\n __sock_sendmsg net/socket.c:736 [inline]\n ____sys_sendmsg+0x972/0x9f0 net/socket.c:2585\n ___sys_sendmsg+0x2a5/0x360 net/socket.c:2639\n __sys_sendmsg net/socket.c:2671 [inline]\n __do_sys_sendmsg net/socket.c:2676 [inline]\n __se_sys_sendmsg net/socket.c:2674 [inline]\n __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7facf899c819\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:00007facf9827028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007facf8c15fa0 RCX: 00007facf899c819\nRDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004\nRBP: 00007facf8a32c91 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007facf8c16038 R14: 00007facf8c15fa0 R15: 00007ffd41b01c78\n </TASK>\n\nAllocated by task 11013:\n kasan_save_stack mm/kasan/common.c:57 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n unpoison_slab_object mm/kasan/common.c:340 [inline]\n __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366\n kasan_slab_alloc include/linux/kasan.h:253 [inline]\n slab_post_alloc_hook mm/slub.c:4538 [inline]\n slab_alloc_node mm/slub.c:4866 [inline]\n kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885\n sock_alloc_inode+0x28/0xc0 net/socket.c:316\n alloc_inode+0x6a/0x1b0 fs/inode.c:347\n new_inode_pseudo include/linux/fs.h:3003 [inline]\n sock_alloc net/socket.c:631 [inline]\n __sock_create+0x12d/0x9d0 net/socket.c:1562\n sock_create net/socket.c:1656 [inline]\n __sys_socketpair+0x1c4/0x560 net/socket.c:1803\n __do_sys_socketpair net/socket.c:1856 [inline]\n __se_sys_socketpair net/socket.c:1853 [inline]\n __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1853\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 15:\n kasan_save_stack mm/kasan/common.c:57 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584\n poison_slab_object mm/kasan/common.c:253 [inline]\n __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285\n kasan_slab_free include/linux/kasan.h:235 [inline]\n slab_free_hook mm/slub.c:2685 [inline]\n slab_free mm/slub.c:6165 [inline]\n kmem_cache_free+0x187/0x630 mm/slub.c:6295\n rcu_do_batch kernel/rcu/tree.c:\n---truncated---",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
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        "name": "linux"
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        "1:6.6.62-1+rpt1",
        "1:6.6.74-1+rpt1",
        "1:6.12.20-1+rpt1~bpo12+1",
        "1:6.12.25-1+rpt1",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43016"
    },
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      "url": "https://git.kernel.org/stable/c/8d597e3e74027900ffa81b8ff47ab51999a3e110"
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    "severity": {
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      "scenario": "AV:L - The vulnerable callback is reached through local BPF sockmap setup and local AF_UNIX send/close activity, not by unauthenticated network packets alone.\nAC:L - The attacker can create the socketpair, install the sockmap verdict path, and race sendmsg against close/orphaning of the peer socket; both sides of the race are attacker-controlled.\nPR:L - Creating and attaching the required sockmap/SK_SKB or SK_MSG BPF objects requires BPF/CAP_NET_ADMIN-style privileges, but these can be available to a low-privileged local user in delegated or user-namespace BPF deployments; choosing the higher severity option gives PR:L.\nUI:N - No victim action is needed after the attacker has local execution and the required BPF access; triggering is done with attacker-controlled syscalls.\nS:U - The impact is within the kernel security authority and represents ordinary kernel memory corruption or privilege escalation, not a cross-scope boundary such as guest-to-host escape.\nC:H - This is a use-after-free of the socket object used to fetch proto_ops, and kernel UAFs can be shaped into information disclosure primitives.\nI:H - The stale socket pointer can lead to use of attacker-influenced freed memory and function-pointer-oriented control flow, making arbitrary modification or code execution defensible.\nA:H - The reported KASAN splat demonstrates a kernel use-after-free reachable from sendmsg, and repeated triggering can crash or destabilize the kernel."
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}