Out-of-bounds read in Linux kernel - CVE-2026-43350
Published: May 9, 2026
Vulnerability identifier: #VU130833
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-43350
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in parse_dacl() when parsing ACE SIDs returned by an SMB server. A remote attacker can send a specially crafted ACE with a truncated NFS mode SID to disclose sensitive information.
The issue occurs because an ACE with only two subauthorities can still match the NFS mode SID pattern, leading to a read of sid.sub_auth[2] past the end of the ACE.
How to mitigate CVE-2026-43350
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21
- https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7
- https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896
- https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b
- https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4