SB20260917190 - Out-of-bounds read in Linux kernel net vxlan driver
Published: September 17, 2026
Security Bulletin ID
SB20260917190
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-89776)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
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