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bpf: sockmap: fix tail fragment offset in bpf_msg_push_data

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-63926

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-63926

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2026-63926

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40899 · Revision 1
Added to Heist Feed
Publisher date
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