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Debian: CVE-2024-49854: linux, linux-6.1 -- security update

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Debian: CVE-2024-49854: linux, linux-6.1 -- security update

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
10/21/2024
Created
11/12/2024
Added
11/11/2024
Modified
01/30/2025

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.

Solution(s)

  • debian-upgrade-linux
  • debian-upgrade-linux-6-1

References

  • https://attackerkb.com/topics/cve-2024-49854
  • CVE - 2024-49854
  • DLA-4008-1
  • 查看数 694
  • 已创建
  • 最后回复

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