CVE-2026-98872
kernel: freevxfs: don't BUG() on unknown typed-extent type
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 23, 2026
Updated · October 26, 2026
Description
A flaw was found in the Linux kernel's FreeVxFS filesystem driver. When encountering an unrecognized extent type in an on-disk structure, the driver triggers a fatal kernel panic instead of handling the error cleanly. A local user can exploit this flaw by querying file block mappings on a specially crafted filesystem, resulting in a system crash and a Denial of Service (DoS).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-617 · Reachable Assertion