Bug 2307861 (CVE-2024-43888)

Summary: CVE-2024-43888 kernel: mm: list_lru: fix UAF for memory cgroup
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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A possible use-after-free was found in the Linux kernel in mm/list_lru.c.
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Bug Depends On: 2308106    
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Description OSIDB Bzimport 2024-08-26 11:20:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm: list_lru: fix UAF for memory cgroup

The mem_cgroup_from_slab_obj() is supposed to be called under rcu lock or
cgroup_mutex or others which could prevent returned memcg from being
freed.  Fix it by adding missing rcu read lock.

Found by code inspection.

[songmuchun: only grab rcu lock when necessary, per Vlastimil]
  Link: https://lkml.kernel.org/r/20240801024603.1865-1-songmuchun@bytedance.com
Comment 1 Mauro Matteo Cascella 2024-08-27 10:39:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024082659-CVE-2024-43888-5beb@gregkh/T
Comment 2 errata-xmlrpc 2024-11-12 09:39:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:9315 https://access.redhat.com/errata/RHSA-2024:9315