xen: x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regula...
CVE-2022-26362 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-26362, released June 9, 2022. It is not reported as exploited. Patch Radar priority: Routine.
x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.16.2-1 | DEBIAN-CVE-2022-26362 | Jun 9, 2022 |
| xen · Debian 13.5 (trixie) | 4.16.2-1 | DEBIAN-CVE-2022-26362 | Jun 9, 2022 |
| xen · Debian 14 | 4.16.2-1 | DEBIAN-CVE-2022-26362 | Jun 9, 2022 |
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