CVE-2026-63912Critical· 9.8▾ MidnightIn 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 dest…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.7%
Last analysed / modified upstream
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.
Linux >= c075c3ea031757f8ea2d34567565b61a868c08d5 < 566295735530ee513326049b0540f32ec050bf2eLinux >= a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea < 5d7ab86e2b6bc23054616bf6ac562013bf60af8cLinux >= 5bd8baab087dff657e05387aee802e70304cc813 < 36519e3d941fc99d3b52c134dbaf311f987a4708Linux >= 5bd8baab087dff657e05387aee802e70304cc813 < 322e48187e0245ab2fff6fec2220b0cae677dbecLinux >= 5bd8baab087dff657e05387aee802e70304cc813 < b84091ceddc9f133229dceab3ccc930bf27f9cbaLinux >= 5bd8baab087dff657e05387aee802e70304cc813 < c093468aea8277f77272a4f199b2e15e19cabb59Linux >= 5bd8baab087dff657e05387aee802e70304cc813 < 65f3b3fc2347b89fe21db1e92c7681368415f095Linux >= 5bd8baab087dff657e05387aee802e70304cc813 < dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40Linux 2c66b0c95bb0aa7652ba1eba293d0d5993b35a38Linux ef6f83df1209a7d9bd1c605a62457d4c00f9179eLinux 3defefd22ad5fbbe639b6157fb7e6311b2bf333dLinux b657030870bb5351c5b1e84d4e9f186da6ca0496Linux >= 5.10.113 < 5.10.259Linux >= 5.15.36 < 5.15.210Linux >= 4.14.288 < 4.15Linux >= 4.19.252 < 4.20Linux >= 5.4.205 < 5.5Linux >= 5.17.5 < 5.18Linux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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