A flaw was found in the Linux kernel's KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.
Platform | Package | Release Date | Advisory |
---|---|---|---|
Amazon Linux 1 | kernel | 2021-09-30 19:25 | ALAS-2021-1539 |
Amazon Linux 2 - Core | kernel | 2021-08-13 17:31 | ALAS2-2021-1699 |
Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2022-01-20 23:37 | ALAS2KERNEL-5.10-2022-002 |
Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-01-12 19:26 | ALAS2KERNEL-5.4-2022-004 |
Score Type | Score | Vector | |
---|---|---|---|
Amazon Linux | CVSSv3 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
NVD | CVSSv2 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
NVD | CVSSv3 | 7.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L |