Bug 2323927 (CVE-2024-50127)

Summary: CVE-2024-50127 kernel: net: sched: fix use-after-free in taprio_change()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2324032    
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Description OSIDB Bzimport 2024-11-05 18:02:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: sched: fix use-after-free in taprio_change()

In 'taprio_change()', 'admin' pointer may become dangling due to sched
switch / removal caused by 'advance_sched()', and critical section
protected by 'q->current_entry_lock' is too small to prevent from such
a scenario (which causes use-after-free detected by KASAN). Fix this
by prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update
'admin' immediately before an attempt to schedule freeing.
Comment 1 Robb Gatica 2024-11-05 21:15:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110557-CVE-2024-50127-c0b5@gregkh/T
Comment 2 errata-xmlrpc 2025-05-13 08:32:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966