CVE-2026-43350

HIGH EPSS 12.9%
Published May 8, 20261mo ago · Modified Jun 19, 20261w ago
7.6 CVSS 3.1
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 19, 2026 1w ago

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 Details

Base Score
7.6
Exploitability
2.8
Impact
4.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Low
Availability High

Threat Intelligence

EPSS Exploit Probability
12.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.4  –  <6.6.136
linuxlinux_kernel*≥6.7  –  <6.12.84
linuxlinux_kernel*≥6.13  –  <6.18.25
linuxlinux_kernel*≥6.19  –  <7.0.2

References 8

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

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4
    Patch