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CVE-2026-64380

Last refreshed2026-10-17

Status: UPDATED  |  Advisory ID: CVE-2026-64380

Key Details

CVECVE-2026-64380
CVSS Score / Version
8.2 (High) / CVSS v3.1
Updated2026-10-16
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is low; integrity impact is none; availability impact is high.
Affected products
Linux Kernel

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
LinuxLinux Kernel
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

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

smb: client: harden POSIX SID length parsing

posix_info_sid_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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-64380
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-64380

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