PT-2024-9047 · Linux+3 · Linux Kernel+3
Changhuizhong
·
Published
2024-05-24
·
Updated
2026-03-14
·
CVE-2021-47552
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Linux kernel versions prior to 5.15.0
Description:
The vulnerability is related to the blk-mq component of the Linux kernel, which can cause a kernel NULL pointer dereference when the scsi device is freed before running blk release queue(). This issue can lead to a denial of service. The vulnerability is caused by the fact that the blk-mq dispatch work is not properly canceled in both blk cleanup queue and disk release.
Recommendations:
To resolve the issue, update the Linux kernel to a version that includes the fix for this vulnerability. Specifically, ensure that the blk-mq dispatch work is properly canceled in both blk cleanup queue and disk release. As a temporary workaround, consider disabling the
blk mq quiesce queue() function until a patch is available. However, this workaround may have performance implications and should be used with caution.Note: The provided information does not include specific details about the number of potentially affected devices or real-world incidents where this issue was exploited.
Fix
NULL Pointer Dereference
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linux Kernel
Red Os
Suse