CVE-2025-22111
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-22111
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22111.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-22111
- Downstream
- Related
- Published
- 2025-04-16T14:12:57.719Z
- Modified
- 2026-01-19T19:35:13.834882Z
- Summary
- net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.
SIOCBRDELIF is passed to devioctl() first and later forwarded to brioctl_call(), which causes unnecessary RTNL dance and the splat below [0] under RTNL pressure.
Let's say Thread A is trying to detach a device from a bridge and Thread B is trying to remove the bridge.
In devioctl(), Thread A bumps the bridge device's refcnt by netdevhold() and releases RTNL because the following brioctlcall() also re-acquires RTNL.
In the race window, Thread B could acquire RTNL and try to remove the bridge device. Then, rtnlunlock() by Thread B will release RTNL and wait for netdevput() by Thread A.
Thread A, however, must hold RTNL after the unlock in dev_ifsioc(), which may take long under RTNL pressure, resulting in the splat by Thread B.
Thread A (SIOCBRDELIF) Thread B (SIOCBRDELBR) ---------------------- ---------------------- sockioctl sockioctl
- sock_do_ioctl- brioctlcall- dev_ioctl- brioctlstub |- rtnllock | |- devifsioc ' ' |- dev = _devgetbyname(...) |- netdevhold(dev, ...) . / |- rtnlunlock ------. | | |- brioctlcall---> |- rtnl_lock Race | |- brioctlstub |- brdelbridge Window | | | |- dev = _devgetbyname(...) | | | May take long |- br_dev_delete(dev, ...) | | | under RTNL pressure |- unregisternetdevicequeue(dev, ...) | | | |- rtnl_unlock \ | |- rtnl_lock <-'- netdevruntodo | |- ...- netdev_run_todo |- rtnlunlock |- _rtnlunlock | |- netdevwaitallrefsany |- netdev_put(dev, ...) <----------------' Wait refcnt decrement and log splat belowTo avoid blocking SIOCBRDELBR unnecessarily, let's not call dev_ioctl() for SIOCBRADDIF and SIOCBRDELIF.
In the dev_ioctl() path, we do the following:
- Copy struct ifreq by getuserifreq in sockdoioctl()
- Check CAPNETADMIN in dev_ioctl()
- Call devload() in devioctl()
Fetch the master dev from ifr.ifrname in devifsioc()
- can be done by requestmodule() in brioctlcall(), so we move 1., 2., and 4. to brioctl_stub().
Note that 2. is also checked later in adddelif(), but it's better performed before RTNL.
SIOCBRADDIF and SIOCBRDELIF have been processed in dev_ioctl() since the pre-git era, and there seems to be no specific reason to process them there.
reftracker: wpan3@ffff8880662d8608 has 1/1 users at _netdevtrackeralloc include/linux/netdevice.h:4282 [inline] netdevhold include/linux/netdevice.h:4311 [inline] devifsioc+0xc6a/0x1160 net/core/devioctl.c:624 devioctl+0x255/0x10c0 net/core/devioctl.c:826 sockdoioctl+0x1ca/0x260 net/socket.c:1213 sockioctl+0x23a/0x6c0 net/socket.c:1318 vfsioctl fs/ioctl.c:51 [inline] _dosysioctl fs/ioctl.c:906 [inline] _sesysioctl fs/ioctl.c:892 [inline] _x64sysioctl+0x1a4/0x210 fs/ioctl.c:892 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xcb/0x250 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22111.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/00fe0ac64efd1f5373b3dd9f1f84b19235371e39
- https://git.kernel.org/stable/c/338a0f3c66aef4ee13052880d02200aae8f2d8a8
- https://git.kernel.org/stable/c/4888e1dcc341e9a132ef7b8516234b3c3296de56
- https://git.kernel.org/stable/c/d767ce15045df510f55cdd2af5df0eee71f928d0
- https://git.kernel.org/stable/c/ed3ba9b6e280e14cc3148c1b226ba453f02fa76c
- https://git.kernel.org/stable/c/f51e471cb1577d510c3096e126678e1ea20d2efd
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22111.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-22111
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced893b195875340cb44b54c9db99e708145f1210e8Fixedf51e471cb1577d510c3096e126678e1ea20d2efdFixed338a0f3c66aef4ee13052880d02200aae8f2d8a8Fixedd767ce15045df510f55cdd2af5df0eee71f928d0Fixed4888e1dcc341e9a132ef7b8516234b3c3296de56Fixed00fe0ac64efd1f5373b3dd9f1f84b19235371e39Fixeded3ba9b6e280e14cc3148c1b226ba453f02fa76c