CVE-2026-63926
bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the Linux kernel patch for bpf_msg_push_data.
- Ensure the right fragment offset calculation is correct.
- Validate scatterlist fragment layout after data insertion.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63926.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63926 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63926
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-63926 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63926 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'f14609d8146707452e0822f3c8154674ce677251', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'd81b323af2dcee47573907ccb89c0df9b45cb2e2', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'aeb95146848d12206e1b2cfacd4f40e21ce81d94', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '96b72672ce849a1402730238e64d9b20bf06a96d', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '3075c21d2d76c0067f4a382765b43d6cc10470f1', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '5e19028667963fb371ebb00cecc2a473ef92056b', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '63f64a510c7917658ddf4d073ece73914ee25346', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'f72eed9b84fb771019a955908132410a9ba9ea3f', 'versionType': 'git'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'affected'}] 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. Added Reference https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1 Added Reference https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b Added Reference https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346 Added Reference https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d Added Reference https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94 Added Reference https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2 Added Reference https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251 Added Reference https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f