Critical 9.8Published Jul 19, 2026

CVE-2026-63912xfrm: esp: restore combined single-frag length gate

Updated under an hour ago (Oct 28, 2026, 1:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c075c3ea031757f8ea2d34567565b61a868c08d5 before 566295735530ee513326049b0540f32ec050bf2e; from a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea before 5d7ab86e2b6bc23054616bf6ac562013bf60af8c; from 5bd8baab087dff657e05387aee802e70304cc813 before 36519e3d941fc99d3b52c134dbaf311f987a4708; from 5bd8baab087dff657e05387aee802e70304cc813 before 322e48187e0245ab2fff6fec2220b0cae677dbec; from 5bd8baab087dff657e05387aee802e70304cc813 before b84091ceddc9f133229dceab3ccc930bf27f9cba; from 5bd8baab087dff657e05387aee802e70304cc813 before c093468aea8277f77272a4f199b2e15e19cabb59; from 5bd8baab087dff657e05387aee802e70304cc813 before 65f3b3fc2347b89fe21db1e92c7681368415f095; from 5bd8baab087dff657e05387aee802e70304cc813 before dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40; and 10 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e
https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c
https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708
https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec
https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba
https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59
https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095
https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.