# RHSA-2026:83159: Security update for 12 packages

RHSA-2026:83159, released October 16, 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-2026-83159
- Platform: Linux
- Released: Oct 16, 2026
- Priority: Urgent (Closes CVE-2026-89526, rated Critical)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:83159

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-rt](https://patchblox.com/security/data/product/linux/kernel-rt.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-core](https://patchblox.com/security/data/product/linux/kernel-rt-core.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug](https://patchblox.com/security/data/product/linux/kernel-rt-debug.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-core.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-debug-devel.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-debug-kvm.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-devel](https://patchblox.com/security/data/product/linux/kernel-rt-devel.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-kvm](https://patchblox.com/security/data/product/linux/kernel-rt-kvm.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-modules](https://patchblox.com/security/data/product/linux/kernel-rt-modules.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |
| [kernel-rt-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-modules-extra.md) | RHEL 8 | 0:4.18.0-553.174.1.rt7.515.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-89526](https://patchblox.com/security/data/cve/CVE-2026-89526.md) | Urgent | svcrdma: Validate Read chunk positions before reconstruction | 9.8 | 0.0068 |  |
| [CVE-2026-90036](https://patchblox.com/security/data/cve/CVE-2026-90036.md) | Urgent | NFSD: Prevent client use-after-free during blocked-lock reaping | 9.8 | 0.0048 |  |
| [CVE-2026-68377](https://patchblox.com/security/data/cve/CVE-2026-68377.md) | Urgent | net/sched: act_tunnel_key: Defer dst_release to RCU callback | 9.8 | 0.0013 |  |
| [CVE-2026-93228](https://patchblox.com/security/data/cve/CVE-2026-93228.md) | High | svcrdma: Reject Write/Reply chunks with segcount 0 | 9.1 | 0.0050 |  |
| [CVE-2026-74705](https://patchblox.com/security/data/cve/CVE-2026-74705.md) | High | udp: fix potential use-after-free in tunnel segmentation | 10.0 | 0.0050 |  |
| [CVE-2026-72262](https://patchblox.com/security/data/cve/CVE-2026-72262.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  ASoC: SOF: ipc3-control: Fix heap overflow in by... | 8.8 | 0.0018 |  |
| [CVE-2026-93262](https://patchblox.com/security/data/cve/CVE-2026-93262.md) | High | md/raid5-ppl: fix use-after-free in ppl_do_flush() | 8.8 | 0.0015 |  |
| [CVE-2026-74641](https://patchblox.com/security/data/cve/CVE-2026-74641.md) | High | ALSA: usx2y: bound the hwdep mmap fault offset | 8.8 | 0.0013 |  |
| [CVE-2026-74583](https://patchblox.com/security/data/cve/CVE-2026-74583.md) | High | net/sched: cls_route: fix fastmap use-after-free on filter | 8.8 | 0.0012 |  |

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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