Out-of-bounds read in Linux kernel - CVE-2026-43406
Published: May 8, 2026
Vulnerability identifier: #VU130773
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-2026-43406
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 process_message_header() when processing a maliciously corrupted message frame. A remote attacker can send a specially crafted message frame to disclose sensitive information.
The issue can be triggered if the control segment length is smaller than the message header size or if a different frame is made to appear as a message frame.
How to mitigate CVE-2026-43406
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8
- https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb
- https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5
- https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2
- https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb
- https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4
- https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1