SB2026100791 - Reachable assertion in Linux kernel core
Published: October 7, 2026
Security Bulletin ID
SB2026100791
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) Reachable assertion (CVE-ID: CVE-2026-98278)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to trigger a kernel warning.
The vulnerability exists due to a reachable warning assertion in dev_fill_forward_path() when a flowtable attempts to offload a flow through a tunnel with a routing loop. A local privileged user can configure the route to the tunnel's remote endpoint to resolve back to the tunnel itself to trigger a kernel warning.
Exploitation requires the CAP_NET_ADMIN capability.
Remediation
Install update from vendor's website.