PT-2026-61243 · Linux · Linux

CVE-2026-63926 · Published 2026-07-19 · Updated 2026-07-19

Mitre

CVSS v3.1

8.4

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

In the Linux kernel, the following vulnerability has been resolved:

bpf: sockmap: fix tail fragment offset in bpf msg push data

When bpf msg push data() inserts data in the middle of a scatterlist entry, it splits the original entry into a left fragment and a right fragment.

The right fragment offset is page-local, but the code advances it with start, which is the message-global insertion point. For inserts into a non-first SG entry, this over-advances the offset and leaves the split layout inconsistent.

Advance the right fragment offset by the fragment-local delta, start - offset, which matches the length removed from the front of the original entry.

Fix

Related Identifiers

CVE-2026-63926

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-63926 · Security Note
• https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d · Note
• https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94 · Note
• https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346 · Note
• https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251 · Note
• https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1 · Note
• https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b · Note
• https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f · Note
• https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2 · Note