# RHSA-2026:55765: Security update for 12 packages

RHSA-2026:55765, released August 19, 2026, fixes 11 CVEs across 12 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-55765
- Platform: Linux
- Released: Aug 19, 2026
- Priority: Urgent (Closes CVE-2026-53374, rated Critical)
- CVEs: 11, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:55765

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-rt](https://patchblox.com/security/data/product/linux/kernel-rt.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-core](https://patchblox.com/security/data/product/linux/kernel-rt-core.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug](https://patchblox.com/security/data/product/linux/kernel-rt-debug.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-core.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-debug-devel.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-debug-kvm.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-devel](https://patchblox.com/security/data/product/linux/kernel-rt-devel.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-kvm.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-modules](https://patchblox.com/security/data/product/linux/kernel-rt-modules.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |
| [kernel-rt-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-modules-extra.md) | RHEL 8 | 0:4.18.0-553.156.1.rt7.497.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-53374](https://patchblox.com/security/data/cve/CVE-2026-53374.md) | Urgent | drm/amdgpu: zero-initialize GART table on allocation | 9.8 | 0.0013 |  |
| [CVE-2026-74580](https://patchblox.com/security/data/cve/CVE-2026-74580.md) | High | vhost: reset the vring metadata cache on vring reconfiguration | 8.8 | 0.0041 |  |
| [CVE-2026-63884](https://patchblox.com/security/data/cve/CVE-2026-63884.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: m... | 7.8 | 0.0018 |  |
| [CVE-2025-39902](https://patchblox.com/security/data/cve/CVE-2025-39902.md) | High | mm/slub: avoid accessing metadata when pointer is invalid in object_err() | 7.8 | 0.0017 |  |
| [CVE-2026-64219](https://patchblox.com/security/data/cve/CVE-2026-64219.md) | High | drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async | 7.8 | 0.0017 |  |
| [CVE-2026-17523](https://patchblox.com/security/data/cve/CVE-2026-17523.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: m... | 7.8 | 0.0017 |  |
| [CVE-2026-53329](https://patchblox.com/security/data/cve/CVE-2026-53329.md) | High | drm/amd/display: Use krealloc_array() in dal_vector_reserve() | 7.8 | 0.0015 |  |
| [CVE-2026-63879](https://patchblox.com/security/data/cve/CVE-2026-63879.md) | High | drm/amdgpu: fix amdgpu_hmm_range_get_pages | 7.8 | 0.0014 |  |
| [CVE-2026-53016](https://patchblox.com/security/data/cve/CVE-2026-53016.md) | High | crypto: ccp - copy IV using skcipher ivsize | 7.8 | 0.0014 |  |
| [CVE-2026-43206](https://patchblox.com/security/data/cve/CVE-2026-43206.md) | High | kernel-zfcpdump-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: m... | 7.8 | 0.0014 |  |
| [CVE-2026-53136](https://patchblox.com/security/data/cve/CVE-2026-53136.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: m... | 7.8 | 0.0013 |  |

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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