CVE-2022-26356
First published: Tue Apr 05 2022(Updated: )
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.
Credit: security@xen.org security@xen.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | >=4.0.0<4.12.0 | |
| Xen Xen | >=4.13.0<4.14.0 | |
| Xen Xen | >=4.15.0<4.16.0 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 | |
| debian/xen | <=4.11.4+107-gef32c7afa2-1 | 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2022/04/05/1
- http://xenbits.xen.org/xsa/advisory-397.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UHFSRVLM2JUCPDC2KGB7ETPQYJLCGBLD/
- https://www.debian.org/security/2022/dsa-5117
- https://xenbits.xenproject.org/xsa/advisory-397.txt
- https://xenbits.xen.org/xsa/advisory-397.html
- https://security-tracker.debian.org/tracker/CVE-2022-26356
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHFSRVLM2JUCPDC2KGB7ETPQYJLCGBLD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/
- https://security.gentoo.org/glsa/202402-07
Frequently Asked Questions
What is CVE-2022-26356?
CVE-2022-26356 is a vulnerability caused by racy interactions between dirty vram tracking and paging log dirty hypercalls in Xen.
What is the severity of CVE-2022-26356?
The severity of CVE-2022-26356 is medium with a severity value of 5.6.
Which software is affected by CVE-2022-26356?
Xen versions between 4.0.0 and 4.12.0, Xen versions between 4.13.0 and 4.14.0, Xen versions between 4.15.0 and 4.16.0, Debian Linux 11.0, Fedora 34, and Fedora 35 are affected by CVE-2022-26356.
How can I fix CVE-2022-26356?
To fix CVE-2022-26356, update to Xen version 4.14.6-1, 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, or 4.17.2+55-g0b56bed864-1.
Where can I find more information about CVE-2022-26356?
More information about CVE-2022-26356 can be found at the following references: [1](http://www.openwall.com/lists/oss-security/2022/04/05/1), [2](http://xenbits.xen.org/xsa/advisory-397.html), [3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/).
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