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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2024-49854 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink 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 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-49854
NVD Published Date:
10/21/2024
NVD Last Modified:
10/23/2024
Source:
kernel.org