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PatchSiren cyber security CVE debrief

CVE-2026-23103 Linux CVE debrief

A race condition vulnerability was found in the Linux kernel's ipvlan implementation. The addrs_lock, which protects the ipvlan address list, was incorrectly shared among all ipvlan devices instead of being per-port. This could lead to false negatives in ipvlan_addr_busy() and races when adding or removing addresses. The vulnerability is considered minor but could potentially cause issues. The issue has been resolved by making the addrs_lock per-port. The fix involves introducing per-port addrs_lock and updating relevant code.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-04
Original CVE updated
2026-07-14
Advisory published
2026-02-04
Advisory updated
2026-07-14

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux kernel versions 4.17 to 6.19-rc6. They should review and apply the provided patches to ensure the addrs_lock is properly used per-port. They should also update Linux kernel to a version that includes the fix and monitor for potential issues with ipvlan address management.

Technical summary

The Linux kernel's ipvlan implementation had a race condition vulnerability due to the addrs_lock being shared among all ipvlan devices instead of being per-port. This was fixed by introducing per-port addrs_lock and updating relevant code to use the new lock. The vulnerability had a CVSS score of 7.8 and was considered HIGH severity. The issue has been resolved by making the addrs_lock per-port. The fix involves introducing per-port addrs_lock and updating relevant code.

Defensive priority

Medium

Recommended defensive actions

  • Review and apply the provided patches to ensure the addrs_lock is properly used per-port
  • Update Linux kernel to a version that includes the fix
  • Monitor for potential issues with ipvlan address management
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-02-04T17:16:21.177Z and last modified on 2026-07-14T13:18:24.807Z. The NVD entry is currently Modified. The Linux kernel's ipvlan implementation had a race condition vulnerability due to the addrs_lock being shared among all ipvlan devices instead of being per-port. This was fixed by introducing per-port addrs_lock and updating relevant code to use the new lock. The vulnerability had a CVSS score of 7.8 and was considered HIGH severity. The issue has been resolved by making the addrs_lock per-port. Evidence limits suggest that this issue could potentially cause false negatives in ipvlan_addr_busy() and races when adding or removing addresses.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-02-04T17:16:21.177Z and has not been modified since then.