CVE-2025-22111 (GCVE-0-2025-22111)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:12 – Updated: 2026-01-19 12:17
VLAI?
Title
net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.
Summary
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 | `- rtnl_unlock |- __rtnl_unlock | |- netdev_wait_allrefs_any |- netdev_put(dev, ...) <----------------' Wait refcnt decrement and log splat below To avoid blocking SIOCBRDELBR unnecessarily, let's not call dev_ioctl() for SIOCBRADDIF and SIOCBRDELIF. In the dev_ioctl() path, we do the following: 1. Copy struct ifreq by get_user_ifreq in sock_do_ioctl() 2. Check CAP_NET_ADMIN in dev_ioctl() 3. Call dev_load() in dev_ioctl() 4. Fetch the master dev from ifr.ifr_name in dev_ifsioc() 3. can be done by request_module() in br_ioctl_call(), so we move 1., 2., and 4. to br_ioctl_stub(). Note that 2. is also checked later in add_del_if(), 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. [0]: unregister_netdevice: waiting for wpan3 to become free. Usage count = 2 ref_tracker: wpan3@ffff8880662d8608 has 1/1 users at __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline] netdev_hold include/linux/netdevice.h:4311 [inline] dev_ifsioc+0xc6a/0x1160 net/core/dev_ioctl.c:624 dev_ioctl+0x255/0x10c0 net/core/dev_ioctl.c:826 sock_do_ioctl+0x1ca/0x260 net/socket.c:1213 sock_ioctl+0x23a/0x6c0 net/socket.c:1318 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x1a4/0x210 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcb/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < f51e471cb1577d510c3096e126678e1ea20d2efd (git)
Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < 338a0f3c66aef4ee13052880d02200aae8f2d8a8 (git)
Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < d767ce15045df510f55cdd2af5df0eee71f928d0 (git)
Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < 4888e1dcc341e9a132ef7b8516234b3c3296de56 (git)
Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < 00fe0ac64efd1f5373b3dd9f1f84b19235371e39 (git)
Affected: 893b195875340cb44b54c9db99e708145f1210e8 , < ed3ba9b6e280e14cc3148c1b226ba453f02fa76c (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.65 , ≤ 6.12.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/if_bridge.h",
            "net/bridge/br_ioctl.c",
            "net/bridge/br_private.h",
            "net/core/dev_ioctl.c",
            "net/socket.c"
          ],
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/if_bridge.h",
            "net/bridge/br_ioctl.c",
            "net/bridge/br_private.h",
            "net/core/dev_ioctl.c",
            "net/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.198",
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            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.65",
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            },
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              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 RTNL dance and the splat\nbelow [0] under RTNL pressure.\n\nLet\u0027s 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\u0027s 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                    \u0027\n        \u0027  |- dev = __dev_get_by_name(...)\n           |- netdev_hold(dev, ...)      .\n       /   |- rtnl_unlock  ------.       |\n       |   |- br_ioctl_call       `---\u003e  |- 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  \u003c-\u0027          `- netdev_run_todo\n           |     |- ...                        `- netdev_run_todo\n           |     `- rtnl_unlock                   |- __rtnl_unlock\n           |                                      |- netdev_wait_allrefs_any\n           |- netdev_put(dev, ...)  \u003c----------------\u0027\n                                                Wait refcnt decrement\n                                                and log splat below\n\nTo avoid blocking SIOCBRDELBR unnecessarily, let\u0027s 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\u0027s 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-19T12:17:54.573Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f51e471cb1577d510c3096e126678e1ea20d2efd"
        },
        {
          "url": "https://git.kernel.org/stable/c/338a0f3c66aef4ee13052880d02200aae8f2d8a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d767ce15045df510f55cdd2af5df0eee71f928d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/4888e1dcc341e9a132ef7b8516234b3c3296de56"
        },
        {
          "url": "https://git.kernel.org/stable/c/00fe0ac64efd1f5373b3dd9f1f84b19235371e39"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed3ba9b6e280e14cc3148c1b226ba453f02fa76c"
        }
      ],
      "title": "net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22111",
    "datePublished": "2025-04-16T14:12:57.719Z",
    "dateReserved": "2024-12-29T08:45:45.820Z",
    "dateUpdated": "2026-01-19T12:17:54.573Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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