CVE-2022-49884

In the Linux kernel, the following vulnerability has been resolved: KVM: Initialize gfn_to_pfn_cache locks in dedicated helper Move the gfn_to_pfn_cache lock initialization to another helper and call the new helper during VM/vCPU creation. There are race conditions possible due to kvm_gfn_to_pfn_cache_init()'s ability to re-initialize the cache's locks. For example: a race between ioctl(KVM_XEN_HVM_EVTCHN_SEND) and kvm_gfn_to_pfn_cache_init() leads to a corrupted shinfo gpc lock. (thread 1) | (thread 2) | kvm_xen_set_evtchn_fast | read_lock_irqsave(&gpc->lock, ...) | | kvm_gfn_to_pfn_cache_init | rwlock_init(&gpc->lock) read_unlock_irqrestore(&gpc->lock, ...) | Rename "cache_init" and "cache_destroy" to activate+deactivate to avoid implying that the cache really is destroyed/freed. Note, there more races in the newly named kvm_gpc_activate() that will be addressed separately. [sean: call out that this is a bug fix]

The following products are affected by CVE-2022-49884 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2022-49884.

URL	Resource
https://git.kernel.org/stable/c/52491a38b2c2411f3f0229dc6ad610349c704a41
https://git.kernel.org/stable/c/61242001d6c9c253df7645dab090842d8da08764
https://lore.kernel.org/linux-cve-announce/2025050155-CVE-2022-49884-27c4@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49884
https://www.cve.org/CVERecord?id=CVE-2022-49884