net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.
In the Linux kernel, the following vulnerability has been resolved: net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF. SIOCBRDELIF is passed to dev_ioctl() first and later forwarded to br_ioctl_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 dev_ioctl(), Thread A bumps the bridge device's refcnt by netdev_hold() and releases RTNL because the following br_ioctl_call() also re-acquires RTNL. In the race window, Thread B could acquire RTNL and try to remove the bridge device. Then, rtnl_unlock() by Thread B will release RTNL and wait for netdev_put() 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) ---------------------- ---------------------- sock_ioctl sock_ioctl `- sock_do_ioctl `- br_ioctl_call `- dev_ioctl `- br_ioctl_stub |- rtnl_lock | |- dev_ifsioc ' ' |- dev = __dev_get_by_name(...) |- netdev_hold(dev, ...) . / |- rtnl_unlock ------. | | |- br_ioctl_call `---> |- rtnl_lock Race | | `- br_ioctl_stub |- br_del_bridge Window | | | |- dev = __dev_get_by_name(...) | | | May take long | `- br_dev_delete(dev, ...) | | | under RTNL pressure | `- unregister_netdevice_queue(dev, ...) | | | | `- rtnl_unlock \ | |- rtnl_lock <-' `- netdev_run_todo | |- ... `- netdev_run_todo |
CVE-2025-22111
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-22111
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "f51e471cb1577d510c3096e126678e1ea20d2efd",
"versionType": "git"
},
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "338a0f3c66aef4ee13052880d02200aae8f2d8a8",
"versionType": "git"
},
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "d767ce15045df510f55cdd2af5df0eee71f928d0",
"versionType": "git"
},
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "4888e1dcc341e9a132ef7b8516234b3c3296de56",
"versionType": "git"
},
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "00fe0ac64efd1f5373b3dd9f1f84b19235371e39",
"versionType": "git"
},
{
"status": "affected",
"version": "893b195875340cb44b54c9db99e708145f1210e8",
"lessThan": "ed3ba9b6e280e14cc3148c1b226ba453f02fa76c",
"versionType": "git"
}
],
"programFiles": [
"include/linux/if_bridge.h",
"net/bridge/br_ioctl.c",
"net/bridge/br_private.h",
"net/core/dev_ioctl.c",
"net/socket.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.198",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.160",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.120",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.65",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.14.2",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/linux/if_bridge.h",
"net/bridge/br_ioctl.c",
"net/bridge/br_private.h",
"net/core/dev_ioctl.c",
"net/socket.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-22111
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26981 · Revision 1
- Added to Heist Feed
- Publisher date