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CVE-2026-92489: xfrm: Fix skb double-free in xfrm_dev_direct_output()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix skb double-free in xfrm_dev_direct_output() A return value other than 1 from local_out() means that the skb has been consumed or its ownership was transferred. xfrm_dev_direct_output() nevertheless frees the skb on this path, causing a double-free when netfilter drops the packet and invalidating any other owner. Return the local_out() result directly, matching the ownership handling in xfrm_output_resume().

Affected products

• Linux kernel: from 6.6.85 before 6.6.157; from 6.12.21 before 6.12.110; from 6.13.9 before 6.14; 6.14 — fixed in 6.12.110, 6.14, 6.6.157, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.12.110, 6.14, 6.6.157, 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/02deb637e965950148752a304dd1471212dd6470
• https://git.kernel.org/stable/c/2aed51fc58d9ce450e2c116efb956160fd06fa02
• https://git.kernel.org/stable/c/56a347950e661c1a7f8f31c43a2ea53c2323b6f4
• https://git.kernel.org/stable/c/621871b696b108026bf4b44ed4085ffa2102f417
• https://git.kernel.org/stable/c/bc9297796bfdcc8d9609236e54519a4f38737aac

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