What’s Vulnerable › Vulnerabilities

CVE-2026-72450: xfrm: validate selector family and prefixlen during match

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: validate selector family and prefixlen during match syzbot reported a shift-out-of-bounds in xfrm_selector_match() due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set). Fix this by: - Rejecting mismatched families in xfrm_selector_match. - Returning false in addr4_match if prefixlen > 32. - Returning false in addr_match if prefixlen > 128 (prevents overflow).

Affected products

• Linux kernel: from 5.10.229 before 5.10.261; from 5.15.170 before 5.15.212; from 6.1.115 before 6.1.178; from 6.6.59 before 6.6.145; from 4.19.323 before 4.20; from 5.4.285 before 5.5 — fixed in 4.20, 5.10.261, 5.15.212, 5.5, 6.1.178, 6.12

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.261, 5.15.212, 5.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78
• https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae
• https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe
• https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f
• https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee
• https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a
• https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b
• https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986

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