CVE-2026-63926

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f14609d8146707452e0822f3c8154674ce677251affected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < d81b323af2dcee47573907ccb89c0df9b45cb2e2affected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < aeb95146848d12206e1b2cfacd4f40e21ce81d94affected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 96b72672ce849a1402730238e64d9b20bf06a96daffected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 3075c21d2d76c0067f4a382765b43d6cc10470f1affected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 5e19028667963fb371ebb00cecc2a473ef92056baffected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 63f64a510c7917658ddf4d073ece73914ee25346affected
LinuxLinux6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f72eed9b84fb771019a955908132410a9ba9ea3faffected
LinuxLinux4.20affected
LinuxLinux0 < 4.20unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References