NULL pointer dereference in Linux kernel - CVE-2026-43364
Published: May 9, 2026
Vulnerability identifier: #VU130816
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43364
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in ublk_ctrl_set_size() when handling UBLK_CMD_UPDATE_SIZE requests for a device that has not yet been started or has already been stopped. A local user can send a crafted UPDATE_SIZE command to cause a denial of service.
The issue can be triggered before UBLK_CMD_START_DEV completes or after UBLK_CMD_STOP_DEV runs.
How to mitigate CVE-2026-43364
Install security update from vendor's repository.