Answer in brief
CVE-2022-49562 records a High severity (CVSS 7.8) vulnerability in KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <38b888911e8dc89b89d8147cfb1d2dbe6373bf78 || >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <8089e5e1d18402fb8152d6b6815450a36fffa9b0 || >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <f122dfe4476890d60b8c679128cd2259ec96a24c | 38b888911e8dc89b89d8147cfb1d2dbe6373bf78, 8089e5e1d18402fb8152d6b6815450a36fffa9b0, f122dfe4476890d60b8c679128cd2259ec96a24c |
| Linux/Linuxgeneric | 5.2 | Not reported |
Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2022-49562 records a High severity (CVSS 7.8) vulnerability in KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <38b888911e8dc89b89d8147cfb1d2dbe6373bf78 || >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <8089e5e1d18402fb8152d6b6815450a36fffa9b0 || >=bd53cb35a3e9adb73a834a36586e9ad80e877767 <f122dfe4476890d60b8c679128cd2259ec96a24c | 38b888911e8dc89b89d8147cfb1d2dbe6373bf78, 8089e5e1d18402fb8152d6b6815450a36fffa9b0, f122dfe4476890d60b8c679128cd2259ec96a24c |
| Linux/Linuxgeneric | 5.2 | Not reported |
Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.