CVE-2026-63926 (GCVE-0-2026-63926)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
VLAI
Title
bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
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.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < f14609d8146707452e0822f3c8154674ce677251 (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < d81b323af2dcee47573907ccb89c0df9b45cb2e2 (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < aeb95146848d12206e1b2cfacd4f40e21ce81d94 (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 96b72672ce849a1402730238e64d9b20bf06a96d (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 3075c21d2d76c0067f4a382765b43d6cc10470f1 (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 5e19028667963fb371ebb00cecc2a473ef92056b (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 63f64a510c7917658ddf4d073ece73914ee25346 (git)
Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < f72eed9b84fb771019a955908132410a9ba9ea3f (git)
Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "datePublished": "2026-07-19T14:55:27.154Z",
    "dateReserved": "2026-07-19T07:54:57.021Z",
    "dateUpdated": "2026-07-20T13:41:36.086Z",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.