HighFix available
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.260, 5.15.211, 6.1.154, 6.12.49, 6.16.9, 6.6.108
- CVEs
- CVE-2025-39931
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 12:29 UTC · Revision 1
Source evidence
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
core-osv · Original sourcePublished 4 Oct 2025, 07:30 UTC
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
osv:CVE-2025-39931
Kernel
Fixed versions: 5.10.260, 5.15.211, 6.1.154, 6.6.108, 6.12.49, 6.16.9
Complete source record
{
"id": "b4eca022be536a9acc276eb42614a4b014eb12067b5eaedaf29d694a3e71a7c2",
"url": "https://osv.dev/vulnerability/CVE-2025-39931",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "crypto: af_alg - Set merge to zero early in af_alg_sendmsg",
"summary": "In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.",
"evidence": "osv:CVE-2025-39931",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.260",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.211",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.154",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.108",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.49",
"evidence": "/affected/1/ranges"
},
{
"value": "6.16.9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2025-39931",
"aliases": [
"CVE-2025-39931"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2"
},
{
"fixed": "28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf"
},
{
"fixed": "db2b42425dfbde4983b0c20fb7cfa05f70e6a745"
},
{
"fixed": "6241b9e2809b12da9130894cf5beddf088dc1b8a"
},
{
"fixed": "2374c11189ef704a3e4863646369f1b8e6a27d71"
},
{
"fixed": "24c1106504c625fabd3b7229611af617b4c27ac7"
},
{
"fixed": "045ee26aa3920a47ec46d7fcb302420bf01fd753"
},
{
"fixed": "9574b2330dbd2b5459b74d3b5e9619d39299fc6f"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39931.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.6.38"
},
{
"fixed": "5.10.260"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.211"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.154"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.108"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.49"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.16.9"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39931.json"
}
}
],
"modified": "2026-10-28T02:30:28.547262609Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
"https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
"https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
"https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753",
"https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71",
"https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7",
"https://git.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf",
"https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a",
"https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f",
"https://git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39931.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-39931",
"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/2025/39xxx/CVE-2025-39931.json"
}
},
"related_cves": [
{
"value": "CVE-2025-39931",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495402,
"published_at": "2025-10-04T07:30:55.964+00:00"
}