CVE-2026-63926bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
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: 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.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/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 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before f14609d8146707452e0822f3c8154674ce677251; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before d81b323af2dcee47573907ccb89c0df9b45cb2e2; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before aeb95146848d12206e1b2cfacd4f40e21ce81d94; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before 96b72672ce849a1402730238e64d9b20bf06a96d; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before 3075c21d2d76c0067f4a382765b43d6cc10470f1; 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 builds before 5e19028667963fb371ebb00cecc2a473ef92056b; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before 63f64a510c7917658ddf4d073ece73914ee25346; from 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 before f72eed9b84fb771019a955908132410a9ba9ea3f | CNA record |
References
- https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251
- https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2
- https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94
- https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d
- 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/f72eed9b84fb771019a955908132410a9ba9ea3f
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.