SB2026091979 - NULL pointer dereference in Linux kernel fuse
Published: September 19, 2026
Security Bulletin ID
SB2026091979
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) NULL pointer dereference (CVE-ID: CVE-2026-90139)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 a null pointer dereference in fuse_fill_super_submount when processing an auto-submount after root inode allocation fails under memory pressure. A local user can access an auto-submount to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/17120c5bfb16808509ea18d7fab6027802d93eba
- https://git.kernel.org/stable/c/509f4a09bae7f03c87f67f053648874a5e177867
- https://git.kernel.org/stable/c/928f659a3e3650978a5b4829cc982324f72b474b
- https://git.kernel.org/stable/c/a5129155ca9fba40d77ff19ffead8244e88d6f9c
- https://git.kernel.org/stable/c/e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1