# CVE-2026-62436: xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...

CVE-2026-62436 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-62436, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-62436
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 28, 2026

## Description

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]  With the introduction of Grant Table v2 came the requirement to be able to switch between versions.  Switching from v1 to v2 reduces the number of valid grant references, as a bigger shared entry structure is then needed while the shared table doesn't change size.  Switching from v2 back to v1 the status frames, which are separate in v2, go away.  Code holding, but intermediately dropping and then re-acquiring the grant table lock, sometimes wrongly assumes that said properties wouldn't change across the window in time where the lock is not being held.  The v1 -> v2 issue is CVE-2026-62435.  The v2 -> v1 issue is CVE-2026-62436.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | [DEBIAN-CVE-2026-62436](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62436.md) | Aug 3, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | [DEBIAN-CVE-2026-62436](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62436.md) | Aug 3, 2026 |
| Linux | xen Debian 14 | 4.20.3+127-gc42374a105-1 | [DEBIAN-CVE-2026-62436](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62436.md) | Aug 3, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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