# CVE-2022-49556: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: SVM: Use kzalloc for sev ioctl interfaces t...

CVE-2022-49556 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49556, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49556
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.2-1 | [DEBIAN-CVE-2022-49556](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49556.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.2-1 | [DEBIAN-CVE-2022-49556](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49556.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.2-1 | [DEBIAN-CVE-2022-49556](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49556.md) | Feb 26, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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