# RHSA-2026:49030: kernel security update

RHSA-2026:49030, released August 1, 2026, fixes 4 CVEs in kernel (version 6.12.0-55.94.1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-49030
- Platform: Linux
- Released: Aug 1, 2026
- Priority: Urgent (Closes CVE-2026-64562, rated Critical)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:49030

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 10 | 6.12.0-55.94.1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-64562](https://patchblox.com/security/data/cve/CVE-2026-64562.md) | Urgent | KVM: nVMX: Hide shadow VMCS right after VMCLEAR | 9.8 | 0.0016 |  |
| [CVE-2026-64561](https://patchblox.com/security/data/cve/CVE-2026-64561.md) | High | KVM: x86: Check for invalid/obsolete root *after* making MMU pages available | 8.8 | 0.0027 |  |
| [CVE-2026-63807](https://patchblox.com/security/data/cve/CVE-2026-63807.md) | High | KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level | 8.8 | 0.0017 |  |
| [CVE-2025-40026](https://patchblox.com/security/data/cve/CVE-2025-40026.md) | High | KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O | 7.9 | 0.0017 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo