# CVE-2022-33748: xen: lock order inversion in transitive grant copy handling As part of XSA-226 a missing cleanup call was inserted on an e...

CVE-2022-33748 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-33748, released October 11, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-33748
- Priority: Routine
- CVSS: 5.6 (medium)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 11, 2022

## Description

lock order inversion in transitive grant copy handling As part of XSA-226 a missing cleanup call was inserted on an error handling path. While doing so, locking requirements were not paid attention to. As a result two cooperating guests granting each other transitive grants can cause locks to be acquired nested within one another, but in respectively opposite order. With suitable timing between the involved grant copy operations this may result in the locking up of a CPU.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33748](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33748.md) | Oct 11, 2022 |
| Linux | xen Debian 13.5 (trixie) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33748](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33748.md) | Oct 11, 2022 |
| Linux | xen Debian 14 | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33748](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33748.md) | Oct 11, 2022 |

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