# RHSA-2026:85774: Security update for 12 packages

RHSA-2026:85774, released October 20, 2026, fixes 9 CVEs across 12 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-85774
- Platform: Linux
- Released: Oct 20, 2026
- Priority: Urgent (Closes CVE-2026-89479, rated Critical)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:85774

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-rt](https://patchblox.com/security/data/product/linux/kernel-rt.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-core](https://patchblox.com/security/data/product/linux/kernel-rt-core.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug](https://patchblox.com/security/data/product/linux/kernel-rt-debug.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-core.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-debug-devel.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-debug-kvm.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-devel](https://patchblox.com/security/data/product/linux/kernel-rt-devel.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-kvm.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-modules](https://patchblox.com/security/data/product/linux/kernel-rt-modules.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |
| [kernel-rt-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-modules-extra.md) | RHEL 8 | 0:4.18.0-553.176.1.rt7.517.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-89479](https://patchblox.com/security/data/cve/CVE-2026-89479.md) | Urgent | sctp: stop processing a packet once its association is deleted | 9.8 | 0.0050 |  |
| [CVE-2026-89631](https://patchblox.com/security/data/cve/CVE-2026-89631.md) | Urgent | smb: client: reject a tree connect response whose byte count is too small | 9.1 | 0.0049 |  |
| [CVE-2026-98320](https://patchblox.com/security/data/cve/CVE-2026-98320.md) | Urgent | netfilter: flowtable: hold reference on ct until flow is released | 9.8 | 0.0014 |  |
| [CVE-2026-74752](https://patchblox.com/security/data/cve/CVE-2026-74752.md) | High | sctp: validate cookie AUTH state before use | 9.8 | 0.0052 |  |
| [CVE-2026-74588](https://patchblox.com/security/data/cve/CVE-2026-74588.md) | High | sctp: keep chunk->transport in step with the list it is queued on | 9.8 | 0.0050 |  |
| [CVE-2026-53196](https://patchblox.com/security/data/cve/CVE-2026-53196.md) | High | USB: serial: io_ti: fix heap overflow in get_manuf_info() | 8.8 | 0.0027 |  |
| [CVE-2026-93288](https://patchblox.com/security/data/cve/CVE-2026-93288.md) | High | netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state | 8.8 | 0.0013 |  |
| [CVE-2026-93817](https://patchblox.com/security/data/cve/CVE-2026-93817.md) | High | perf: Fix addr_filter_ranges lifetime | 8.8 | 0.0013 |  |
| [CVE-2026-52935](https://patchblox.com/security/data/cve/CVE-2026-52935.md) | High | xfrm: espintcp: do not reuse an in-progress partial send | 8.8 | 0.0010 |  |

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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