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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00182.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < f14609d8146707452e0822f3c8154674ce677251
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < d81b323af2dcee47573907ccb89c0df9b45cb2e2
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < aeb95146848d12206e1b2cfacd4f40e21ce81d94
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < 96b72672ce849a1402730238e64d9b20bf06a96d
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < 3075c21d2d76c0067f4a382765b43d6cc10470f1
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < 5e19028667963fb371ebb00cecc2a473ef92056b
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < 63f64a510c7917658ddf4d073ece73914ee25346
6fff607e2f14bd7c63c06c464a6f93b8efbabe28 affected < f72eed9b84fb771019a955908132410a9ba9ea3f
Linux Linux affected
Version Status Constraints
4.20 affected —
0 unaffected < 4.20
5.10.259 unaffected ≤ 5.10.*
5.15.210 unaffected ≤ 5.15.*
6.1.176 unaffected ≤ 6.1.*
6.6.143 unaffected ≤ 6.6.*
6.12.93 unaffected ≤ 6.12.*
6.18.35 unaffected ≤ 6.18.*
7.0.12 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux Subscribe
Linux Kernel Subscribe

Project Subscriptions

Vendors Products
Linux Subscribe
Linux Kernel Subscribe
Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8593-1 Linux kernel vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1 cve-icon
https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b cve-icon
https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346 cve-icon
https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d cve-icon
https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94 cve-icon
https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2 cve-icon
https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251 cve-icon
https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f cve-icon
https://lore.kernel.org/linux-cve-announce/2026071949-CVE-2026-63926-cc75@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-63926 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-63926 cve-icon
History

Wed, 22 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-823
References
Metrics threat_severity

None

 threat_severity

Moderate

Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Sun, 19 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-20T13:41:36.086Z

Reserved: 2026-07-19T07:54:57.021Z

Link: CVE-2026-63926

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-19T00:00:00Z

Links: CVE-2026-63926 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-07-24T05:30:05Z

Weaknesses