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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.35, 6.6.143, 7.0.12
- CVEs
- CVE-2026-63926
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 02:41 UTC · Revision 1
Source evidence
bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
core-osv · Original sourcePublished 19 Jul 2026, 14:55 UTC
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.
osv:CVE-2026-63926
Kernel
Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12
Complete source record
{
"id": "f30877108927e2604f68886ee2094b2faef24fb96f905b7cc68423dc56aeb2e3",
"url": "https://osv.dev/vulnerability/CVE-2026-63926",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2026-63926",
"products": [
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"evidence": "/affected/1/package/name"
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"evidence": "/affected/1/ranges"
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{
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"evidence": "/affected/1/ranges"
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{
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{
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"affected_versions": []
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"severity": "high",
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"aliases": [
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"metrics": [
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}
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"package": {
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"modified": "2026-10-28T02:30:46.194642550Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1",
"https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b",
"https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346",
"https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d",
"https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94",
"https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2",
"https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251",
"https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63926.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-63926",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63926.json"
}
},
"related_cves": [
{
"value": "CVE-2026-63926",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 514369,
"published_at": "2026-07-19T14:55:27.154+00:00"
}