In the Linux kernel, the following vulnerability has been resolved:
ax25: rcu protect dev->ax25_ptr
syzbot found a lockdep issue [1].
We should remove ax25 RTNL dependency in ax25_setsockopt()
This should also fix a variety of possible UAF in ax25.
[1]
WARNING: possible circular locking dependency detected
syz.5.1818/12806 is trying to acquire lock: ffffffff8fcb3988 (rtnlmutex){+.+.}-{4:4}, at: ax25setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680
but task is already holding lock: ffff8880617ac258 (sklock-AFAX25){+.+.}-{0:0}, at: locksock include/net/sock.h:1618 [inline] ffff8880617ac258 (sklock-AFAX25){+.+.}-{0:0}, at: ax25setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (sklock-AFAX25){+.+.}-{0:0}: lockacquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 locksocknested+0x48/0x100 net/core/sock.c:3642 locksock include/net/sock.h:1618 [inline] ax25killbydevice net/ax25/afax25.c:101 [inline] ax25deviceevent+0x24d/0x580 net/ax25/afax25.c:146 notifiercallchain+0x1a5/0x3f0 kernel/notifier.c:85 _devnotifyflags+0x207/0x400 devchangeflags+0xf0/0x1a0 net/core/dev.c:9026 devifsioc+0x7c8/0xe70 net/core/devioctl.c:563 devioctl+0x719/0x1340 net/core/devioctl.c:820 sockdoioctl+0x240/0x460 net/socket.c:1234 sockioctl+0x626/0x8e0 net/socket.c:1339 vfsioctl fs/ioctl.c:51 [inline] _dosysioctl fs/ioctl.c:906 [inline] _sesysioctl+0xf5/0x170 fs/ioctl.c:892 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f
-> #0 (rtnlmutex){+.+.}-{4:4}: checkprevadd kernel/locking/lockdep.c:3161 [inline] checkprevsadd kernel/locking/lockdep.c:3280 [inline] validatechain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 _lockacquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lockacquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 _mutexlockcommon kernel/locking/mutex.c:585 [inline] _mutexlock+0x1ac/0xee0 kernel/locking/mutex.c:735 ax25setsockopt+0xa55/0xe90 net/ax25/afax25.c:680 dosocksetsockopt+0x3af/0x720 net/socket.c:2324 _syssetsockopt net/socket.c:2349 [inline] _dosyssetsockopt net/socket.c:2355 [inline] _sesyssetsockopt net/socket.c:2352 [inline] _x64syssetsockopt+0x1ee/0x280 net/socket.c:2352 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sklock-AFAX25); lock(rtnlmutex); lock(sklock-AFAX25); lock(rtnlmutex);
* DEADLOCK *
1 lock held by syz.5.1818/12806: #0: ffff8880617ac258 (sklock-AFAX25){+.+.}-{0:0}, at: locksock include/net/sock.h:1618 [inline] #0: ffff8880617ac258 (sklock-AFAX25){+.+.}-{0:0}, at: ax25setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574
stack backtrace: CPU: 1 UID: 0 PID: 12806 Comm: syz.5.1818 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> _dumpstack lib/dumpstack.c:94 [inline] dumpstacklvl+0x241/0x360 lib/dumpstack.c:120 printcircularbug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 checknoncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 checkprevadd kernel/locking/lockdep.c:3161 [inline] checkprevs_add kernel/lockin ---truncated---
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"digest": {
"function_hash": "196514550599354316262242924166479795962",
"length": 79.0
},
"deprecated": false,
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2802ed4ced27ebd474828fc67ffd7d66f11e3605",
"signature_type": "Function",
"target": {
"file": "include/net/ax25.h",
"function": "ax25_dev_ax25dev"
}
}
]
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21812.json"