CVE-2022-49556

HIGH EPSS 16.5%
Published Feb 26, 20251y ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
16.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.7  –  <5.10.124
linuxlinux_kernel*≥5.11  –  <5.15.45
linuxlinux_kernel*≥5.16  –  <5.17.13
linuxlinux_kernel*≥5.18  –  <5.18.2

References 5

  • git.kernel.org https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418
    Patch