SB20260905107 - Race condition in Linux kernel net vxlan driver
Published: September 5, 2026
Security Bulletin ID
SB20260905107
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-80838)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to a race condition in vxlan FDB flush handling when flushing filtered FDB entries whose sole remote matches. A local user can trigger a filtered bulk FDB flush while an RCU reader accesses the parent FDB entry to cause memory corruption.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2a7c2f00843225d5f037676bca649321f3d024c7
- https://git.kernel.org/stable/c/4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab
- https://git.kernel.org/stable/c/8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c
- https://git.kernel.org/stable/c/a8820c8a7718327e96849782033e7c85a0f6bcfe
- https://git.kernel.org/stable/c/d5d4a7b538b52db63927773a8905fcd9f78a42e2