SB2026102451 - Reachable assertion in Linux kernel freevxfs
Published: October 24, 2026
Security Bulletin ID
SB2026102451
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-2026-98872)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service by crashing the Linux kernel.
The vulnerability exists due to a reachable assertion in the freevxfs vxfs_bmap_typed() function when processing an on-disk typed extent with an unsupported type value. A local privileged user can trigger processing of such an extent through ioctl(FIBMAP) on a regular file to invoke BUG() and crash the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1284d687d46953fff9c0d969df108114611aca8b
- https://git.kernel.org/stable/c/405f13d7b270913e06e8e2b4de568985f94ef7d6
- https://git.kernel.org/stable/c/500e9d5bf9eff2096a21b7ac25a0a06ca46ab821
- https://git.kernel.org/stable/c/704d48d81dc41470e108811c32c577ada66192d4
- https://git.kernel.org/stable/c/7ada9807e37103b41f586d34e3075e1209182b65
- https://git.kernel.org/stable/c/f1f2d54a576f0e4133b979e545abcfefd439c300
- https://git.kernel.org/stable/c/fe40a19d571cbb584eea46038ee919d8712b2d2c