Out-of-bounds read in Linux kernel - CVE-2026-89776
Published: September 17, 2026
Vulnerability identifier: #VU150512
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89776
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose kernel memory.
The vulnerability exists due to an out-of-bounds read in the VXLAN VNI filter entry policy when processing short GROUP or GROUP6 netlink attributes. A remote attacker can submit specially crafted netlink attributes to disclose kernel memory.
The over-read bytes are stored in remote_ip and returned through RTM_GETTUNNEL.
Affected software
Linux kernel
How to mitigate CVE-2026-89776
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea
- https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e
- https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324
- https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b
- https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c
- https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be