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CVE-2026-63926

bpf: sockmap: fix tail fragment offset in bpf_msg_push_data

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in f14609d8146707452e0822f3c8154674ce677251; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in d81b323af2dcee47573907ccb89c0df9b45cb2e2; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in aeb95146848d12206e1b2cfacd4f40e21ce81d94; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 96b72672ce849a1402730238e64d9b20bf06a96d; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 3075c21d2d76c0067f4a382765b43d6cc10470f1; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 5e19028667963fb371ebb00cecc2a473ef92056b; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 63f64a510c7917658ddf4d073ece73914ee25346; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in f72eed9b84fb771019a955908132410a9ba9ea3f

  • Linux Linux

    4.20

  • KernelLinux

    From 4.20.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 8

git.kernel.org