CVE-2024-49854

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f	Patch
https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583	Patch
https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf	Patch
https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726	Patch
https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe	Patch
https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

No history.

Information

Published : 2024-10-21 13:15

Updated : 2024-10-23 16:29

NVD link : CVE-2024-49854

Mitre link : CVE-2024-49854

CVE.ORG link : CVE-2024-49854

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-416

Use After Free

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