bpf: sockmap: fix tail fragment offset in bpf_msg_push_data

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63926
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:10 UTC
Updated2026-07-20 15:16:57 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002100000 probability, percentile 0.113630000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 f14609d8146707452e0822f3c8154674ce677251 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 d81b323af2dcee47573907ccb89c0df9b45cb2e2 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 aeb95146848d12206e1b2cfacd4f40e21ce81d94 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 96b72672ce849a1402730238e64d9b20bf06a96d git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 3075c21d2d76c0067f4a382765b43d6cc10470f1 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 5e19028667963fb371ebb00cecc2a473ef92056b git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 63f64a510c7917658ddf4d073ece73914ee25346 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 f72eed9b84fb771019a955908132410a9ba9ea3f git Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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