# OPENSUSE-SU-2026:21738-1: libvirt security update

OPENSUSE-SU-2026:21738-1, released September 2, 2026, fixes 5 CVEs in libvirt (version 11.4.0-160000.5.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-21738-1
- Platform: Linux
- Released: Sep 2, 2026
- Priority: High (Closes CVE-2026-18917, high severity)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:21738-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libvirt](https://patchblox.com/security/data/product/linux/libvirt.md) | opensuse-leap 16.0 | 11.4.0-160000.5.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-18917](https://patchblox.com/security/data/cve/CVE-2026-18917.md) | High | Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow | 7.8 | 0.0018 |  |
| [CVE-2026-63622](https://patchblox.com/security/data/cve/CVE-2026-63622.md) | High | libvirt: A flaw was found in libvirt | 7.8 | 0.0014 |  |
| [CVE-2026-61477](https://patchblox.com/security/data/cve/CVE-2026-61477.md) | Routine | Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config directive injection | 2.3 | 0.0016 |  |
| [CVE-2026-77159](https://patchblox.com/security/data/cve/CVE-2026-77159.md) | Routine | Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink | 5.5 | 0.0016 |  |
| [CVE-2026-63623](https://patchblox.com/security/data/cve/CVE-2026-63623.md) | Routine | Libvirt: information disclosure via world-readable storage volume images during clone/convert | 5.5 | 0.0010 |  |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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