Out-of-bounds read in Linux kernel - CVE-2026-43233
Published: May 7, 2026
Vulnerability identifier: #VU130499
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-2026-43233
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 decode_choice() in nf_conntrack_h323 when processing a crafted Q.931 SETUP message containing a User-User Information Element with PER-encoded data. A remote attacker can send a specially crafted network message to disclose sensitive information.
Exploitation requires the nf_conntrack_h323 helper to be active and can be triggered via port 1720.
How to mitigate CVE-2026-43233
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2a3aac4205e7d2f1aca2e3827de8cdd517d36c4a
- https://git.kernel.org/stable/c/35f1943d242e1b9f0b6e91c0c93bfb293a9f8224
- https://git.kernel.org/stable/c/53d32735d77ab56cc3fc7bd53a7d099418f19be1
- https://git.kernel.org/stable/c/7ef82863d42261817a6394c6c881bd6757a70f16
- https://git.kernel.org/stable/c/81f2fc5b0d0cf4696146f00f837596d10b92dead
- https://git.kernel.org/stable/c/baed0d9ba91d4f390da12d5039128ee897253d60
- https://git.kernel.org/stable/c/bcb50aa0b8f2b74a9fe5a1c7bee6f2657a288041
- https://git.kernel.org/stable/c/f0a83d0a4b7c127d32ac06d607a9214937716129