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Vulnerability record · CVE-2026-43350 · published 8 May 2026

CVE-2026-43350: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE. Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.

7.6 CVSS 3.1 High EPSS 0.40% · top 68.6%
7.6CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
19 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE. Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1592a6cd6f653f2d24572a6976c7a775b19f4940
https://git.kernel.org/stable/c/23b54d6cc3ef30a51d984dc74364f24039ae2ecb
https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21 Patch
https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7 Patch
https://git.kernel.org/stable/c/8bd4cad3f458d11650d51c2d24b03fb1770ae6cc
https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896 Patch
https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b Patch
https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43350), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.