{"id":"CVE-2025-22111","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.\n\nSIOCBRDELIF is passed to dev_ioctl() first and later forwarded to\nbr_ioctl_call(), which causes unnecessary RTN…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.\n\nSIOCBRDELIF is passed to dev_ioctl() first and later forwarded to\nbr_ioctl_call(), which causes unnecessary RTN…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.15, < 6.14.2"],"patched":["linux_kernel 6.14.2"],"published":"2025-04-16","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:17:45.380","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-22111","references":[{"url":"https://git.kernel.org/stable/c/00fe0ac64efd1f5373b3dd9f1f84b19235371e39","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/338a0f3c66aef4ee13052880d02200aae8f2d8a8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4888e1dcc341e9a132ef7b8516234b3c3296de56","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d767ce15045df510f55cdd2af5df0eee71f928d0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed3ba9b6e280e14cc3148c1b226ba453f02fa76c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f51e471cb1577d510c3096e126678e1ea20d2efd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00205,"epssPercentile":0.10453,"ingestedAt":"2026-09-08T15:33:26.998Z","slug":"CVE-2025-22111","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.\n\nSIOCBRDELIF is passed to dev_ioctl() first and later forwarded to\nbr_ioctl_call(), which causes unnecessary RTNL dance and the splat\nbelow [0] under RTNL pressure.\n\nLet's say Thread A is trying to detach a device from a bridge and\nThread B is trying to remove the bridge.\n\nIn dev_ioctl(), Thread A bumps the bridge device's refcnt by\nnetdev_hold() and releases RTNL because the following br_ioctl_call()\nalso re-acquires RTNL.\n\nIn the race window, Thread B could acquire RTNL and try to remove\nthe bridge device. Then, rtnl_unlock() by Thread B will release RTNL\nand wait for netdev_put() by Thread A.\n\nThread A, however, must hold RTNL after the unlock in dev_ifsioc(),\nwhich may take long under RTNL pressure, resulting in the splat by\nThread B.\n\n Thread A (SIOCBRDELIF) Thread B (SIOCBRDELBR)\n ---------------------- ----------------------\n sock_ioctl sock_ioctl\n `- sock_do_ioctl `- br_ioctl_call\n `- dev_ioctl `- br_ioctl_stub\n |- rtnl_lock |\n |- dev_ifsioc '\n ' |- dev = __dev_get_by_name(...)\n |- netdev_hold(dev, ...) .\n / |- rtnl_unlock ------. |\n | |- br_ioctl_call `---> |- rtnl_lock\n Race | | `- br_ioctl_stub |- br_del_bridge\n Window | | | |- dev = __dev_get_by_name(...)\n | | | May take long | `- br_dev_delete(dev, ...)\n | | | under RTNL pressure | `- unregister_netdevice_queue(dev, ...)\n | | | | `- rtnl_unlock\n \\ | |- rtnl_lock <-' `- netdev_run_todo\n | |- ... `- netdev_run_todo\n | `- rtnl_unlock |- __rtnl_unlock\n | |- netdev_wait_allrefs_any\n |- netdev_put(dev, ...) <----------------'\n Wait refcnt decrement\n and log splat below\n\nTo avoid blocking SIOCBRDELBR unnecessarily, let's not call\ndev_ioctl() for SIOCBRADDIF and SIOCBRDELIF.\n\nIn the dev_ioctl() path, we do the following:\n\n 1. Copy struct ifreq by get_user_ifreq in sock_do_ioctl()\n 2. Check CAP_NET_ADMIN in dev_ioctl()\n 3. Call dev_load() in dev_ioctl()\n 4. Fetch the master dev from ifr.ifr_name in dev_ifsioc()\n\n3. can be done by request_module() in br_ioctl_call(), so we move\n1., 2., and 4. to br_ioctl_stub().\n\nNote that 2. is also checked later in add_del_if(), but it's better\nperformed before RTNL.\n\nSIOCBRADDIF and SIOCBRDELIF have been processed in dev_ioctl() since\nthe pre-git era, and there seems to be no specific reason to process\nthem there.\n\n[0]:\nunregister_netdevice: waiting for wpan3 to become free. Usage count = 2\nref_tracker: wpan3@ffff8880662d8608 has 1/1 users at\n __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]\n netdev_hold include/linux/netdevice.h:4311 [inline]\n dev_ifsioc+0xc6a/0x1160 net/core/dev_ioctl.c:624\n dev_ioctl+0x255/0x10c0 net/core/dev_ioctl.c:826\n sock_do_ioctl+0x1ca/0x260 net/socket.c:1213\n sock_ioctl+0x23a/0x6c0 net/socket.c:1318\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x1a4/0x210 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcb/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n## Affected\n\n- `linux_kernel >= 5.15, < 6.14.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.14.2`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221507,"id":"CVE-2025-22111","ts":1792035243697,"field":"cvss","old":null,"new":"5.5"},{"seq":221506,"id":"CVE-2025-22111","ts":1792035243697,"field":"severity","old":"none","new":"medium"}]}