CVE-2022-26356

medium

Description

Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XEN_DMOP_track_dirty_vram (was named HVMOP_track_dirty_vram before Xen 4.9) is racy with ongoing log dirty hypercalls. A suitably timed call to XEN_DMOP_track_dirty_vram can enable log dirty while another CPU is still in the process of tearing down the structures related to a previously enabled log dirty mode (XEN_DOMCTL_SHADOW_OP_OFF). This is due to lack of mutually exclusive locking between both operations and can lead to entries being added in already freed slots, resulting in a memory leak.

References

https://xenbits.xenproject.org/xsa/advisory-397.txt

http://xenbits.xen.org/xsa/advisory-397.html

http://www.openwall.com/lists/oss-security/2022/04/05/1

https://www.debian.org/security/2022/dsa-5117

https://lists.fedoraproject.org/archives/list/[email protected]/message/UHFSRVLM2JUCPDC2KGB7ETPQYJLCGBLD/

https://lists.fedoraproject.org/archives/list/[email protected]/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/

Details

Source: MITRE

Published: 2022-04-05

Updated: 2022-07-29

Type: CWE-772

Risk Information

CVSS v2

Base Score: 4

Vector: AV:L/AC:H/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 1.9

Severity: MEDIUM

CVSS v3

Base Score: 5.6

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

Impact Score: 4

Exploitability Score: 1.1

Severity: MEDIUM