SB2026091710 - Reachable assertion in Linux kernel batman-adv
Published: September 17, 2026
Security Bulletin ID
SB2026091710
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Reachable assertion (CVE-ID: CVE-2026-89950)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to missing skb linearization in batadv_mcast_forw_expand_head() when processing multicast packets via batadv_mcast_forw_mcsend(). A local user can trigger multicast packet forwarding to cause a denial of service.
Remediation
Install update from vendor's website.