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PatchSiren cyber security CVE debrief

CVE-2026-23010 Linux CVE debrief

A use-after-free vulnerability was found in the Linux kernel's inet6_addr_del() function. The vulnerability occurs when ipv6_del_addr() is called before reading the ifp->flags for temporary addresses. This can lead to a use-after-free error, allowing an attacker to potentially execute arbitrary code. The issue was introduced by the accidental movement of ipv6_del_addr() for mngtmpaddr before reading its ifp->flags for temporary addresses in inet6_addr_del().

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-25
Original CVE updated
2026-07-14
Advisory published
2026-01-25
Advisory updated
2026-07-14

Who should care

Linux kernel developers and users who rely on the Linux kernel for their systems should be aware of this vulnerability. They should review the patches provided by the Linux kernel maintainers and apply them to their systems to prevent potential exploitation.

Technical summary

The vulnerability is caused by the accidental movement of ipv6_del_addr() for mngtmpaddr before reading its ifp->flags for temporary addresses in inet6_addr_del(). To fix this, ipv6_del_addr() should be moved down. The vulnerability can be exploited by an attacker with local access to the system, allowing them to potentially execute arbitrary code. The fix involves updating the Linux kernel to a version that includes the patch.

Defensive priority

High

Recommended defensive actions

  • Apply the patches provided by the Linux kernel maintainers
  • Update the Linux kernel to a version that includes the fix
  • Monitor the system for any suspicious activity
  • Use a supported and maintained Linux kernel version
  • 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

Evidence notes

The vulnerability was reported by syzbot and was resolved by moving ipv6_del_addr() down to fix the use-after-free error. The fix is available in the Linux kernel stable branches. Further verification is recommended to confirm affected deployments and ensure proper mitigation.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-25T15:15:55.867Z and has not been modified since then.