SB2026072126 - NULL pointer dereference in Linux kernel block
Published: July 21, 2026
Security Bulletin ID
SB2026072126
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-2026-63810)
CWE-ID: CWE-476 - NULL Pointer Dereference
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 attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the bdev pseudo-filesystem when userspace mounts it and accesses files. A local attacker can mount the pseudo-filesystem and access files to cause a denial of service.
The issue is triggered through move_mount() using inode_operations pointers that are equal to 0 for this pseudo-filesystem.
Remediation
Install update from vendor's website.