CVE-2026-64380

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Source
https://cve.org/CVERecord?id=CVE-2026-64380
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64380.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-64380
Downstream
Related
Published
2026-07-25T08:50:30.476Z
Modified
2026-08-18T03:31:11.179581853Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
Summary
smb: client: harden POSIX SID length parsing
Details

In the Linux kernel, the following vulnerability has been resolved:

smb: client: harden POSIX SID length parsing

posixinfosid_size() reads sid[1] to obtain the subauthority count, but its existing boundary check still accepts buffers with only one remaining byte. Require two bytes before reading sid[1] so all client paths that reuse the helper reject truncated POSIX SIDs safely.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64380.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
349e13ad30b45998bb9937cfe0b32be6f951976d
Fixed
171605aed68380c2fa75dff9b3a1ed427c50065b
Fixed
4213c1208978483021d7d125c131de3985d38f61
Fixed
96e889bc1e759c83f25093e8c2f3da31b4973f30
Fixed
0de5b8e76847f5de26f364a82c6602c4881c30da
Fixed
427eb7eb46425fec845a43e861f3d6e2899cae59
Fixed
86c5d470f5d42e61123b2f4b4f0b91f4eee5b980
Fixed
46a84715a015cb48e1b9c219dc88c03d8a541ea4
Fixed
7ad2bcf2441430bb2e918fb3ef9a90d775a6e422

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64380.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.7.0
Fixed
5.10.261
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.212
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.178
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.145
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.96
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.39
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64380.json"