# CVE-2022-49884: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: Initialize gfn_to_pfn_cache locks in dedica...

CVE-2022-49884 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49884, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49884
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

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]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.8-1 | [DEBIAN-CVE-2022-49884](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49884.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.8-1 | [DEBIAN-CVE-2022-49884](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49884.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.8-1 | [DEBIAN-CVE-2022-49884](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49884.md) | May 1, 2025 |

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