Bug 2300400 (CVE-2024-41033)

Summary: CVE-2024-41033 kernel: cachestat: do not flush stats in recency check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Fixed In Version: kernel 6.9.10, kernel 6.10 Doc Type: If docs needed, set a value
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2301534    
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Description OSIDB Bzimport 2024-07-29 15:31:52 UTC 
In the Linux kernel, the following vulnerability has been resolved:

cachestat: do not flush stats in recency check

syzbot detects that cachestat() is flushing stats, which can sleep, in its
RCU read section (see [1]).  This is done in the workingset_test_recent()
step (which checks if the folio's eviction is recent).

Move the stat flushing step to before the RCU read section of cachestat,
and skip stat flushing during the recency check.

[1]: https://lore.kernel.org/cgroups/000000000000f71227061bdf97e0@google.com/
Comment 1 Mauro Matteo Cascella 2024-07-30 08:57:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024072922-CVE-2024-41033-d23e@gregkh/T
Comment 2 Mauro Matteo Cascella 2024-07-30 08:58:11 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2301534]