SB20240531306 - NULL pointer dereference in Linux kernel block

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2021-47552)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the disk_release() function in block/genhd.c, within the blk_release_queue() function in block/blk-sysfs.c, within the blk_mq_rq_cpu() function in block/blk-mq.c, within the blk_cleanup_queue() function in block/blk-core.c. A local user can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/e03513f58919d9e2bc6df765ca2c9da863d03d90
• https://git.kernel.org/stable/c/2a19b28f7929866e1cec92a3619f4de9f2d20005
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.6
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16