CVE-2022-49562
- Source
- https://cve.org/CVERecord?id=CVE-2022-49562
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49562.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-49562
- Downstream
- Related
- Published
- 2025-02-26T02:14:06Z
- Modified
- 2026-08-12T03:51:47Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits
Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VM_PFNMAP path is broken as it assumes that vm_pgoff is the base pfn of the mapped VMA range, which is conceptually wrong as vm_pgoff is the offset relative to the file and has nothing to do with the pfn. The horrific hack worked for the original use case (backing guest memory with /dev/mem), but leads to accessing "random" pfns for pretty much any other VM_PFNMAP case.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49562.json" }- References
-
- https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78
- https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0
- https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49562.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-49562
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git