HighFix available
smb: client: mask server-provided mode to 07777 in modefromsid
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.261, 5.15.212, 6.1.178, 6.12.96, 6.18.39, 6.6.145, 7.1.4
- CVEs
- CVE-2026-64379
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 21:16 UTC · Revision 1
Source evidence
smb: client: mask server-provided mode to 07777 in modefromsid
core-osv · Original sourcePublished 25 Jul 2026, 08:50 UTC
In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.
osv:CVE-2026-64379
Kernel
Fixed versions: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4
Complete source record
{
"id": "3718b8265b2163dbcef144063937aa7fcf79ee53cc2b55a01b7c6c2a216cbbaf",
"url": "https://osv.dev/vulnerability/CVE-2026-64379",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "smb: client: mask server-provided mode to 07777 in modefromsid",
"summary": "In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.",
"evidence": "osv:CVE-2026-64379",
"products": [
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"name": {
"value": "Kernel",
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"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.261",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.212",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.178",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.145",
"evidence": "/affected/1/ranges"
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{
"value": "6.12.96",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.39",
"evidence": "/affected/1/ranges"
},
{
"value": "7.1.4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-64379",
"aliases": [
"CVE-2026-64379"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"
}
],
"affected": [
{
"ranges": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
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{
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{
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{
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64379.json"
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},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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"events": [
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{
"type": "ECOSYSTEM",
"events": [
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{
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},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
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{
"fixed": "6.12.96"
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]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.39"
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]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
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{
"fixed": "7.1.4"
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]
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],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64379.json"
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],
"modified": "2026-10-28T02:30:23.457674362Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/08c600b7e1818539ba5efee4cdb06215c245ca78",
"https://git.kernel.org/stable/c/5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14",
"https://git.kernel.org/stable/c/b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d",
"https://git.kernel.org/stable/c/c6c484a7d5bff6b929a86d7ed5130f29834c6a0d",
"https://git.kernel.org/stable/c/e3d9c7160d483fc8f9e225aafad8ecbbc43f3151",
"https://git.kernel.org/stable/c/ee2216dbdf0c677e89bb43e03247dba590ed00ef",
"https://git.kernel.org/stable/c/f511807feee7cb29b61bdfa86472c7e9e2e5df94",
"https://git.kernel.org/stable/c/f80add1bfb3425100a325b14f19648e75669a954",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64379.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-64379",
"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/2026/64xxx/CVE-2026-64379.json"
}
},
"related_cves": [
{
"value": "CVE-2026-64379",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490138,
"published_at": "2026-07-25T08:50:29.717+00:00"
}