bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
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.
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