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CVE-2026-63912

CRITICAL
9.8
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-63912
State
PUBLISHED
Assigner
Linux
Reserved
2026-07-19 07:54 UTC
Published
2026-07-19 14:55 UTC
Last updated
2026-07-20 13:41 UTC
Vendor / Product
Linux / Linux
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products (2)
VendorProductPlatformVersions
Linux Linux — c075c3ea031757f8ea2d34567565b61a868c08d5 < 566295735530ee513326049b0540f32ec050bf2e, a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea < 5d7ab86e2b6bc23054616bf6ac562013bf60af8c, 5bd8baab087dff657e05387aee802e70304cc813 < 36519e3d941fc99d3b52c134dbaf311f987a4708, 5bd8baab087dff657e05387aee802e70304cc813 < 322e48187e0245ab2fff6fec2220b0cae677dbec …
Linux Linux — 5.18, 0 < 5.18, 5.10.259 ≤ 5.10.*, 5.15.210 ≤ 5.15.* …
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (8)
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