CVE-2022-49884
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49884
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49884.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49884
- Related
- Published
- 2025-05-01T15:16:13Z
- Modified
- 2025-05-02T13:52:51Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
KVM: Initialize gfntopfn_cache locks in dedicated helper
Move the gfntopfncache lock initialization to another helper and call the new helper during VM/vCPU creation. There are race conditions possible due to kvmgfntopfncacheinit()'s ability to re-initialize the cache's locks.
For example: a race between ioctl(KVMXENHVMEVTCHNSEND) and kvmgfntopfncache_init() leads to a corrupted shinfo gpc lock.
(thread 1) | (thread 2) |kvmxensetevtchnfast | readlockirqsave(&gpc->lock, ...) | | kvmgfntopfncacheinit | rwlockinit(&gpc->lock) readunlockirqrestore(&gpc->lock, ...) |
Rename "cacheinit" and "cachedestroy" to activate+deactivate to avoid implying that the cache really is destroyed/freed.
Note, there more races in the newly named kvmgpcactivate() that will be addressed separately.
[sean: call out that this is a bug fix]
- References
Affected packages
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source