CVE-2022-26356

 

Published at: - 05-04-2022 03:15

Last modified: - 29-07-2022 08:59

Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-397.txt
• http://xenbits.xen.org/xsa/advisory-397.html
• [oss-security] 20220405 Xen Security Advisory 397 v2 (CVE-2022-26356) - Racy interactions between dirty vram tracking and paging log dirty hypercalls-Mailing List, Patch, Third Party Advisory
• DSA-5117-Third Party Advisory
• FEDORA-2022-dfbf7e2372-Mailing List, Third Party Advisory
• FEDORA-2022-64b2c02d29-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2022-26356

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures