CVE-2026-43016

Status: UPDATED  |  Advisory ID: CVE-2026-43016

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

bpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready().

syzbot reported use-after-free of AF_UNIX socket's sk->sk_socket

in sk_psock_verdict_data_ready(). [0]

In unix_stream_sendmsg(), the peer socket's ->sk_data_ready() is

called after dropping its unix_state_lock().

Although the sender socket holds the peer's refcount, it does not

prevent the peer's sock_orphan(), and the peer's sk_socket might

be freed after one RCU grace period.

Let's fetch the peer's sk->sk_socket and sk->sk_socket->ops under

RCU in sk_psock_verdict_data_ready().

[0]:

BUG: KASAN: slab-use-after-free in sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278

Read of size 8 at addr ffff8880594da860 by task syz.4.1842/11013

CPU: 1 UID: 0 PID: 11013 Comm: syz.4.1842 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026

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_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278

unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2482

sock_sendmsg_nosec net/socket.c:721 [inline]

__sock_sendmsg net/socket.c:736 [inline]

____sys_sendmsg+0x972/0x9f0 net/socket.c:2585

___sys_sendmsg+0x2a5/0x360 net/socket.c:2639

__sys_sendmsg net/socket.c:2671 [inline]

__do_sys_sendmsg net/socket.c:2676 [inline]

__se_sys_sendmsg net/socket.c:2674 [inline]

__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

RIP: 0033:0x7facf899c819

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:00007facf9827028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e

RAX: ffffffffffffffda RBX: 00007facf8c15fa0 RCX: 00007facf899c819

RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004

RBP: 00007facf8a32c91 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007facf8c16038 R14: 00007facf8c15fa0 R15: 00007ffd41b01c78

</TASK>

Allocated by task 11013:

kasan_save_stack mm/kasan/common.c:57 [inline]

kasan_save_track+0x3e/0x80 mm/kasan/common.c:78

unpoison_slab_object mm/kasan/common.c:340 [inline]

__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366

kasan_slab_alloc include/linux/kasan.h:253 [inline]

slab_post_alloc_hook mm/slub.c:4538 [inline]

slab_alloc_node mm/slub.c:4866 [inline]

kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885

sock_alloc_inode+0x28/0xc0 net/socket.c:316

alloc_inode+0x6a/0x1b0 fs/inode.c:347

new_inode_pseudo include/linux/fs.h:3003 [inline]

sock_alloc net/socket.c:631 [inline]

__sock_create+0x12d/0x9d0 net/socket.c:1562

sock_create net/socket.c:1656 [inline]

__sys_socketpair+0x1c4/0x560 net/socket.c:1803

__do_sys_socketpair net/socket.c:1856 [inline]

__se_sys_socketpair net/socket.c:1853 [inline]

__x64_sys_socketpair+0x9b/0xb0 net/socket.c:1853

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:

kasan_save_stack mm/kasan/common.c:57 [inline]

kasan_save_track+0x3e/0x80 mm/kasan/common.c:78

kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584

poison_slab_object mm/kasan/common.c:253 [inline]

__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285

kasan_slab_free include/linux/kasan.h:235 [inline]

slab_free_hook mm/slub.c:2685 [inline]

slab_free mm/slub.c:6165 [inline]

kmem_cache_free+0x187/0x630 mm/slub.c:6295

rcu_do_batch kernel/rcu/tree.c:

---truncated--- (NVD)

What to Do

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

References