CVE-2026-63912
In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.
Affected versions
Linux kernel versions
5.10.113,
5.15.36,
4.14.288,
4.19.252,
5.4.205,
5.17.5,
5.18
and later are affected. Fixed in
5.10.259,
5.15.210,
6.1.176,
6.6.143,
6.12.93,
6.18.35,
7.0.12,
7.1
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-63912?
CVE-2026-63912 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.113 onward and has been patched in 5.10.259, 5.15.210, 6.1.176 and others. CVE-2026-63912 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-63912?
Yes — CVE-2026-63912 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.176 and others. If you are running Linux kernel 5.10.113 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-63912 actively exploited?
No — CVE-2026-63912 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.