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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-07-19

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec
• https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708
• https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e
• https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c
• https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095

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