# SUSE-SU-2026:4090-1: xen security update

SUSE-SU-2026:4090-1, released September 8, 2026, fixes 18 CVEs in xen (version 4.20.4_04-150700.3.46.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/suse-su-2026-4090-1
- Platform: Linux
- Released: Sep 8, 2026
- Priority: High (Closes CVE-2026-42493, high severity)
- CVEs: 18, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/SUSE-SU-2026:4090-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [xen](https://patchblox.com/security/data/product/linux/xen.md) | sles 15.7 | 4.20.4_04-150700.3.46.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-42493](https://patchblox.com/security/data/cve/CVE-2026-42493.md) | High | xen: Addressing certain issues, in particular related to operations which may take excessively long and therefore would ne... | 7.5 | 0.0045 |  |
| [CVE-2026-62431](https://patchblox.com/security/data/cve/CVE-2026-62431.md) | High | xen: The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor value, th... | 7.5 | 0.0036 |  |
| [CVE-2026-62433](https://patchblox.com/security/data/cve/CVE-2026-62433.md) | High | xen: Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given operati... | 7.3 | 0.0025 |  |
| [CVE-2026-62432](https://patchblox.com/security/data/cve/CVE-2026-62432.md) | High | xen: The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the corre... | 7.3 | 0.0025 |  |
| [CVE-2026-62430](https://patchblox.com/security/data/cve/CVE-2026-62430.md) | High | xen: Accesses to the CMOS memory contents are done using an indirect IO port pair | 7.5 | 0.0024 |  |
| [CVE-2026-62427](https://patchblox.com/security/data/cve/CVE-2026-62427.md) | High | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 8.8 | 0.0024 |  |
| [CVE-2026-62426](https://patchblox.com/security/data/cve/CVE-2026-62426.md) | High | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 8.8 | 0.0022 |  |
| [CVE-2026-79602](https://patchblox.com/security/data/cve/CVE-2026-79602.md) | High | xen: A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen. | 8.8 | 0.0013 |  |
| [CVE-2026-62428](https://patchblox.com/security/data/cve/CVE-2026-62428.md) | High | xen: When grant-copy operations are processed, the respective grant may or may not already be in use by another operation... | 7.8 | 0.0012 |  |
| [CVE-2026-62434](https://patchblox.com/security/data/cve/CVE-2026-62434.md) | Routine | xen: A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM | 5.3 | 0.0038 |  |
| [CVE-2026-62429](https://patchblox.com/security/data/cve/CVE-2026-62429.md) | Routine | xen: Accessing the vNUMA configuration data of a guest is still possible when domain destruction has already started | 6.5 | 0.0022 |  |
| [CVE-2026-79603](https://patchblox.com/security/data/cve/CVE-2026-79603.md) | Routine | xen: x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them | 4.3 | 0.0022 |  |
| [CVE-2026-42495](https://patchblox.com/security/data/cve/CVE-2026-42495.md) | Routine | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 5.5 | 0.0020 |  |
| [CVE-2026-62423](https://patchblox.com/security/data/cve/CVE-2026-62423.md) | Routine | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 5.5 | 0.0020 |  |
| [CVE-2026-62424](https://patchblox.com/security/data/cve/CVE-2026-62424.md) | Routine | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 5.5 | 0.0020 |  |
| [CVE-2026-62425](https://patchblox.com/security/data/cve/CVE-2026-62425.md) | Routine | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 5.5 | 0.0020 |  |
| [CVE-2026-42494](https://patchblox.com/security/data/cve/CVE-2026-42494.md) | Routine | xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to... | 6.1 | 0.0011 |  |
| [CVE-2026-62437](https://patchblox.com/security/data/cve/CVE-2026-62437.md) | Routine | xen: When guests are terminated, various pieces of cleanup need carrying out | 6.5 | 0.0010 |  |

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Data as of 2026-11-11T01:43:54Z 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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