CVE-2021-22543
Improper memory handling in Linux KVM
- State
- Published
- Severity
- 8.7 High
- Published
- May 26, 2021
- Updated
- Sep 16, 2024
- Reserved
- Jan 5, 2021
Description
An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L |
Weaknesses
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected Products
| Product | Versions |
|---|---|
Linux KernelLinux Kernel |
|
References
- https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
- [oss-security] 20210626 Re: CVE-2021-22543 - /dev/kvm LPEmailing-list
- FEDORA-2021-fe826f202evendor-advisory
- FEDORA-2021-95f2f1cfc7vendor-advisory
- https://security.netapp.com/advisory/ntap-20210708-0002/
- [debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security updatemailing-list
- [debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security updatemailing-list
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