UBUNTU-CVE-2021-22543
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.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
3 explicit affected versions
6 explicit affected versions
4 explicit affected versions
70 explicit affected versions
30 explicit affected versions
50 explicit affected versions
23 explicit affected versions
82 explicit affected versions
4 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
3 explicit affected versions
1 explicit affected versions
32 explicit affected versions
40 explicit affected versions
3 explicit affected versions
32 explicit affected versions
25 explicit affected versions
10 explicit affected versions
17 explicit affected versions
48 explicit affected versions
1 explicit affected versions
19 explicit affected versions
1 explicit affected versions
29 explicit affected versions
13 explicit affected versions
64 explicit affected versions
1 explicit affected versions
35 explicit affected versions
33 explicit affected versions
10 explicit affected versions
49 explicit affected versions
11 explicit affected versions
3 explicit affected versions
72 explicit affected versions
6 explicit affected versions
33 explicit affected versions
68 explicit affected versions
28 explicit affected versions
3 explicit affected versions
1 explicit affected versions
12 explicit affected versions
26 explicit affected versions
1 explicit affected versions
1 explicit affected versions
30 explicit affected versions
5 explicit affected versions
22 explicit affected versions
1 explicit affected versions
23 explicit affected versions
3 explicit affected versions
1 explicit affected versions
26 explicit affected versions
10 explicit affected versions
21 explicit affected versions
44 explicit affected versions
16 explicit affected versions
2 explicit affected versions
17 explicit affected versions
38 explicit affected versions
9 explicit affected versions
23 explicit affected versions
5 explicit affected versions
80 explicit affected versions
57 explicit affected versions
4 explicit affected versions
14 explicit affected versions
48 explicit affected versions
22 explicit affected versions
43 explicit affected versions
1 explicit affected versions
97 explicit affected versions
12 explicit affected versions
25 explicit affected versions
4 explicit affected versions
12 explicit affected versions
1 explicit affected versions
4 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
- https://github.com/torvalds/linux/commit/f8be156be163a052a067306417cd0ff679068c97
- https://ubuntu.com/security/CVE-2021-22543
- https://ubuntu.com/security/notices/USN-5070-1
- https://ubuntu.com/security/notices/USN-5071-1
- https://ubuntu.com/security/notices/USN-5071-2
- https://ubuntu.com/security/notices/USN-5071-3
- https://ubuntu.com/security/notices/USN-5094-1
- https://ubuntu.com/security/notices/USN-5094-2
- https://ubuntu.com/security/notices/USN-5106-1
- https://ubuntu.com/security/notices/USN-5120-1
- https://www.cve.org/CVERecord?id=CVE-2021-22543
- https://www.openwall.com/lists/oss-security/2021/05/26/3
- https://www.openwall.com/lists/oss-security/2021/05/26/4
- https://www.openwall.com/lists/oss-security/2021/05/26/5