Bug 2309788 (CVE-2024-44957)

Summary: CVE-2024-44957 kernel: xen: privcmd: Switch from mutex to spinlock for irqfds
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: 2309872    
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Description OSIDB Bzimport 2024-09-04 19:20:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xen: privcmd: Switch from mutex to spinlock for irqfds

irqfd_wakeup() gets EPOLLHUP, when it is called by
eventfd_release() by way of wake_up_poll(&ctx->wqh, EPOLLHUP), which
gets called under spin_lock_irqsave(). We can't use a mutex here as it
will lead to a deadlock.

Fix it by switching over to a spin lock.
Comment 1 Robb Gatica 2024-09-04 20:22:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090412-CVE-2024-44957-5c8e@gregkh/T