CVE-2024-56764 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ublk: detach gendisk from ublk device if add_disk() fails

Inside ublk_abort_requests() gendisk is grabbed for aborting all inflight requests. And ublk_abort_requests() is called when exiting the uring context or handling timeout.

If add_disk() fails the gendisk may have been freed when calling ublk_abort_requests() so use-after-free can be caused when getting disk’s reference in ublk_abort_requests().

Fixes the bug by detaching gendisk from ublk device if add_disk() fails.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104 https://git.kernel.org/stable/c/7d680f2f76a3417fdfc3946da7471e81464f7b41

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8