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VulnerabilityPublished Updated

CVE-2025-22111: Linux kernel · net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.

Affects Linux kernelSource GCVE Database

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Not known to be exploited · CVSS 5.5 Medium · fixed in 5.15.0-1103.110~20.04.1 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 23:06 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 5.15.0-1103.110~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1103.112~20.04.1 +60
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Apr 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=questingOther threatsAffected
  • 6.17.0-1003.3 – 6.17.0-1017.17
10 affected builds
Fixed in–
Ubuntu 24.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=nobleOther threatsAffected
  • <6.8.0-110.110
Fixed in
  • 6.8.0-110.110
Ubuntu 24.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=nobleOther threatsAffected
  • <6.8.0-1052.55
Fixed in
  • 6.8.0-1052.55
Ubuntu 24.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=nobleOther threatsAffected
  • <6.8.0-1054.60
Fixed in
  • 6.8.0-1054.60
Ubuntu 24.04 LTSlinux-azure-6.11pkg:deb/ubuntu/linux-azure-6.11?arch=source&distro=nobleOther threatsAffected
  • 6.11.0-1008.8~24.04.1 – 6.11.0-1018.18~24.04.1
7 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=nobleOther threatsAffected
  • <6.8.0-1058.65
Fixed in
  • 6.8.0-1058.65

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and has been incorporated in Linux kernel versions 5.15.0-1097.100 and later, as well as other fixed versions listed. Users and administrators should update to these fixed kernel versions to remediate the vulnerability. No additional mitigation steps are required beyond applying the official kernel updates.

Description

CVE-2025-22111 is a medium severity vulnerability in the Linux kernel related to the handling of network bridge interface ioctl calls SIOCBRADDIF and SIOCBRDELIF. The flaw involves an unnecessary RTNL (rtnetlink) lock dance that can cause a race condition and a kernel crash (splat) under RTNL pressure when concurrent threads manipulate bridge devices. The issue arises because dev_ioctl() increments a device's reference count and releases the RTNL lock, while a concurrent thread may remove the bridge device, leading to a deadlock and crash. The fix removes the redundant dev_ioctl() call for these ioctl commands, moving certain checks earlier to avoid blocking and race conditions. This vulnerability affects multiple Linux kernel versions prior to fixed releases in the 5.15.0 series and some older versions. A patch is available and included in updated Linux kernel packages.

References

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