Answer in brief
CVE-2022-49556 records a High severity (CVSS 7.1) vulnerability in KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak. 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 7.1. 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 | >=eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 <401bef1f95de92c3a8c6eece46e02fa88d7285ee || >=eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 <d8fdb4b24097472ff6b3c0559448200d420b1418 || >=eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 <bbdcc644b59e01e98c68894a9fab42b9687f42b0 || >=eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 <57a01725339f9d82b099102ba2751621b1caab93 || >=eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 <d22d2474e3953996f03528b84b7f52cc26a39403 | 401bef1f95de92c3a8c6eece46e02fa88d7285ee, d8fdb4b24097472ff6b3c0559448200d420b1418, bbdcc644b59e01e98c68894a9fab42b9687f42b0, 57a01725339f9d82b099102ba2751621b1caab93, d22d2474e3953996f03528b84b7f52cc26a39403 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.
Quoted source text, attributed separately from HOL analysis.