Out-of-bounds read in Linux kernel - CVE-2026-23397
Published: March 26, 2026
Vulnerability identifier: #VU124641
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-23397
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 cause a denial of service.
The vulnerability exists due to improper input validation in the nfnetlink_osf component when handling TCP option fingerprints. A remote attacker can send a specially crafted request to cause a denial of service.
Exploitation involves sending malicious TCP packets with zero-length options or MSS options with length less than 4, leading to null pointer dereference and out-of-bounds reads during packet matching.
How to mitigate CVE-2026-23397
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/224f4678812e1a7bc8341bcb666773a0aec5ea6f
- https://git.kernel.org/stable/c/3932620c04c2938c93c0890c225960d3d34ba355
- https://git.kernel.org/stable/c/4c6aa008b913e808c4f4d3cde36cb1d9bb5967c6
- https://git.kernel.org/stable/c/aa0574182c46963c3cdb8cde46ec93aca21100d8
- https://git.kernel.org/stable/c/dbdfaae9609629a9569362e3b8f33d0a20fd783c
- https://git.kernel.org/stable/c/ec8bf0571b142f29dc0b68ae2ac3952f7a464b38