CVE-2026-74257

Status: UPDATED  |  Advisory ID: CVE-2026-74257

Key Details

Affected Products, Subsystems & Sectors

What to Know

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--- (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References