SB2024061029 - Privilege escalation in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2024-0562)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the Linux Kernel. When a disk is removed, bdi_unregister is called to stop further write-back and waits for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation work after this has completed, which can result in the timer attempting to access the recently freed bdi_writeback. A local user can execute arbitrary code with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://access.redhat.com/security/cve/CVE-2024-0562
• https://bugzilla.redhat.com/show_bug.cgi?id=2258475
• https://patchwork.kernel.org/project/linux-mm/patch/20220801155034.3772543-1-khazhy@google.com/
• https://access.redhat.com/errata/RHSA-2024:0412