CVE-2026-63912xfrm: esp: restore combined single-frag length gate
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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)
- Not given
- 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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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
- 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.