CVE-2022-49568

MEDIUM EPSS 20.2%
Published Feb 26, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
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: Don't null dereference ops->destroy A KVM device cleanup happens in either of two callbacks: 1) destroy() which is called when the VM is being destroyed; 2) release() which is called when a device fd is closed. Most KVM devices use 1) but Book3s's interrupt controller KVM devices (XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during the machine execution. The error handling in kvm_ioctl_create_device() assumes destroy() is always defined which leads to NULL dereference as discovered by Syzkaller. This adds a checks for destroy!=NULL and adds a missing release(). This is not changing kvm_destroy_devices() as devices with defined release() should have been removed from the KVM devices list by then.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
20.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel* <5.4.210
linuxlinux_kernel*≥5.5  –  <5.10.134
linuxlinux_kernel*≥5.11  –  <5.15.58
linuxlinux_kernel*≥5.16  –  <5.18.15
linuxlinux_kernel5.19any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/170465715a60cbb7876e6b961b21bd3225469da8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3616776bc51cd3262bb1be60cc01c72e0a1959cf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8bc2427018826e02add7b0ed0fc625a60390ae5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e91665fbbf3ccb268b268a7d71a6513538d813ac
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/170465715a60cbb7876e6b961b21bd3225469da8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3616776bc51cd3262bb1be60cc01c72e0a1959cf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8bc2427018826e02add7b0ed0fc625a60390ae5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e91665fbbf3ccb268b268a7d71a6513538d813ac
    Patch