CVE - CVE-2022-49562

CVE-ID
CVE-2022-49562	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78 URL:https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78 MISC:https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0 URL:https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0 MISC:https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c URL:https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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