CVE-2024-49854 - CVE House
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Status published Unknown CVE-2024-49854

block, bfq: fix uaf for accessing waker_bfqq after splitting

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe. Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
e0c20d88b7dce85d2703bb6ba77bf359959675cd, de6c5e3a456019d2182e345730e59721714fa0b5, 19f3bec2ac4be329b9bd12b18a989b867618d2d8, 13b3d0e8cb121f99b11918a0d4bcc1ce4647d352, 4780f50ea50cfe8e89fc3747bf3dd155488433bb, 42c306ed723321af4003b2a41bb73728cab54f85, 9e813033594b141f61ff0ef0cfaaef292564b041, 3a5f45a4ad4e1fd36b0a998eef03d76a4f02a2a8, 3630a18846c7853aa326d3b42fd0a855af7b41bc, 4.19.323, 5.4.285, 5.10.227

Timeline

Official Publish: October 21st, 2024
Last Modified: May 23rd, 2026
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.