Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | >= 4.0.0, < 4.12.0 |
| Debian | Debian Linux | 11.0 |
| Fedoraproject | Fedora | 34 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2022/04/05/1Mailing ListPatchThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-397.htmlPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-07
- https://www.debian.org/security/2022/dsa-5117Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-397.txtThird Party Advisory
- http://www.openwall.com/lists/oss-security/2022/04/05/1Mailing ListPatchThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-397.htmlPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-07
- https://www.debian.org/security/2022/dsa-5117Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-397.txtThird Party Advisory
FAQ
What is CVE-2022-26356?
CVE-2022-26356 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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 w...
How severe is CVE-2022-26356?
CVE-2022-26356 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-26356?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Debian Debian Linux, Fedoraproject Fedora.