CVE-2026-63926
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/07/2026
Last modified:
27/07/2026
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
bpf: sockmap: fix tail fragment offset in bpf_msg_push_data<br />
<br />
When bpf_msg_push_data() inserts data in the middle of a scatterlist<br />
entry, it splits the original entry into a left fragment and a right<br />
fragment.<br />
<br />
The right fragment offset is page-local, but the code advances it with<br />
`start`, which is the message-global insertion point. For inserts into a<br />
non-first SG entry, this over-advances the offset and leaves the split<br />
layout inconsistent.<br />
<br />
Advance the right fragment offset by the fragment-local delta,<br />
`start - offset`, which matches the length removed from the front of the<br />
original entry.
Impact
Base Score 3.x
8.40
Severity 3.x
HIGH
References to Advisories, Solutions, and Tools
- https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1
- https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b
- https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346
- https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d
- https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94
- https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2
- https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251
- https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f