CVE-2026-72299

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

tipc: restrict socket queue dumps in enqueue tracepoints

tipcskenqueue() runs with sk->sk_lock.slock held while the socket is

owned by user context. The spinlock protects the backlog queue in this

path, but it does not serialize against the socket owner consuming or

purging skreceivequeue.

KASAN reported:

  CPU: 14 UID: 0 PID: 1050 Comm: tipc3 Not tainted 7.1.0-rc6+ #126 PREEMPT(lazy)

  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014

  Call Trace:

    <TASK>

    dumpstacklvl+0x76/0xa0 lib/dump_stack.c:123

    print_report+0xce/0x5b0 mm/kasan/report.c:482

    kasan_report+0xc6/0x100 mm/kasan/report.c:597

    _asanreportload4noabort+0x14/0x30 mm/kasan/report_generic.c:380

    tipcskbdump+0x1327/0x16f0 net/tipc/trace.c:73

    tipclistdump+0x208/0x2e0 net/tipc/trace.c:187

    tipcskdump+0xaf6/0xd60 net/tipc/socket.c:3996

    traceeventraweventtipcskclass+0x312/0x5a0 net/tipc/trace.h:188

    tipcskrcv+0xb1d/0x1d50 net/tipc/socket.c:2497

    tipcnodexmit+0x1c3/0x1440 net/tipc/node.c:1689

    _tipcsendmsg+0x97a/0x1440 net/tipc/socket.c:1512

    tipc_sendmsg+0x52/0x80 net/tipc/socket.c:1400

    sock_sendmsg+0x2f6/0x3e0 net/socket.c:825

    splicetosocket+0x7f9/0x1010 fs/splice.c:884

    do_splice+0xe21/0x2330 fs/splice.c:936

    _dosplice+0x153/0x260 fs/splice.c:1431

    _x64sys_splice+0x150/0x230 fs/splice.c:1616

    x64syscall+0xeb5/0x2790 arch/x86/entry/syscall_64.c:41

    dosyscall64+0xf3/0x620 arch/x86/entry/syscall_64.c:63

    entrySYSCALL64afterhwframe+0x76/0x7e arch/x86/entry/entry_64.S:130

  RIP: 0033:0x71624e8aafe2

  Code: 08 0f 85 71 3a ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66

  RSP: 002b:0000716157ffed68 EFLAGS: 00000246 ORIG_RAX: 0000000000000113

  RAX: ffffffffffffffda RBX: 0000716157fff6c0 RCX: 000071624e8aafe2

  RDX: 000000000000005f RSI: 0000000000000000 RDI: 0000000000000066

  RBP: 0000716157ffed90 R08: 0000000000008000 R09: 0000000000000001

  R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffff00

  R13: 0000000000000021 R14: 0000000000000000 R15: 00007fff89799c40

    </TASK>

The TIPCDUMPALL tracepoints in tipcskenqueue() also dump

skreceivequeue and can therefore dereference skbs that the socket

owner has already dequeued or freed. Restrict these dumps to

TIPCDUMPSK_BKLGQ, which matches the queue protected by the held

spinlock.

Keep the change limited to the enqueue path, where the unsafe queue dump

is reachable while the socket is owned by user context.