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CVE

CVE-2026-63912

xfrm: esp: restore combined single-frag length gate
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CVE

CVE-2026-63912

xfrm: esp: restore combined single-frag length gate

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 espoutputhead()

before espoutputtail() 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 skbpagefrag_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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

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, https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba, https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59, https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63912.json, https://nvd.nist.gov/vuln/detail/CVE-2026-63912, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00714%
EPSS Percentile
0.50944%
Introduced Version
c075c3ea031757f8ea2d34567565b61a868c08d5,a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea,5bd8baab087dff657e05387aee802e70304cc813,0,5.10.113,5.15.36,4.14.288,4.19.252,5.4.205,5.17.5,5.11.0,5.16.0,5.18.0,6.2.0,6.7.0,6.13.0
Fix Available
566295735530ee513326049b0540f32ec050bf2e,5d7ab86e2b6bc23054616bf6ac562013bf60af8c,dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40,5.10.259,5.15.210,4.15,4.20,5.5,5.18,6.1.176,6.6.143,6.12.93,6.18.35,7.0.12,6.1.176-1,6.12.94-1,7.0.0-28.28~24.04.1,7.0.0-1016.16~24.04.1,7.0.0-28.28.1~24.04.3,0:5.15.0-323.211.3.3.el8uek,0:6.12.0-206.104.3.3.el9uek,0:5.15.0-323.211.3.3.el9uek,0:6.12.0-206.104.3.3.el10uek,0:5.10.259-258.1043.amzn2,0:1.0-0.amzn2,0:5.15.210-148.245.amzn2,1:6.18.35-68.127.amzn2023,1:1.0-0.amzn2023,1:6.1.176-220.358.amzn2023,1:6.12.94-123.174.amzn2023

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