# RLSA-2026:21557: kernel security update

RLSA-2026:21557, released June 4, 2026, fixes 18 CVEs in kernel (version 0:6.12.0-211.18.1.el10_2). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rlsa-2026-21557
- Platform: Linux
- Released: Jun 4, 2026
- Priority: High (Closes CVE-2026-23455, high severity)
- CVEs: 18, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://errata.rockylinux.org/RLSA-2026:21557

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | rocky 10 | 0:6.12.0-211.18.1.el10_2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-23455](https://patchblox.com/security/data/cve/CVE-2026-23455.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero leng... | 9.1 | 0.0159 |  |
| [CVE-2024-56645](https://patchblox.com/security/data/cve/CVE-2024-56645.md) | High | kernel: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: c... | 7.8 | 0.0068 |  |
| [CVE-2026-31685](https://patchblox.com/security/data/cve/CVE-2026-31685.md) | High | netfilter: ip6t_eui64: reject invalid MAC header for all packets | 9.4 | 0.0049 |  |
| [CVE-2026-43158](https://patchblox.com/security/data/cve/CVE-2026-43158.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  xfs: fix freemap adjustments when adding xattrs... | 8.8 | 0.0047 |  |
| [CVE-2026-43190](https://patchblox.com/security/data/cve/CVE-2026-43190.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length befo... | 8.2 | 0.0046 |  |
| [CVE-2026-43110](https://patchblox.com/security/data/cve/CVE-2026-43110.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  wifi: brcmfmac: validate bsscfg indices in IF ev... | 8.8 | 0.0027 |  |
| [CVE-2026-43051](https://patchblox.com/security/data/cve/CVE-2026-43051.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  HID: wacom: fix out-of-bounds read in wacom_intu... | 8.1 | 0.0026 |  |
| [CVE-2026-43303](https://patchblox.com/security/data/cve/CVE-2026-43303.md) | High | mm/page_alloc: clear page->private in free_pages_prepare() | 7.8 | 0.0017 |  |
| [CVE-2026-23392](https://patchblox.com/security/data/cve/CVE-2026-23392.md) | High | netfilter: nf_tables: release flowtable after rcu grace period on error | 8.8 | 0.0017 |  |
| [CVE-2025-68183](https://patchblox.com/security/data/cve/CVE-2025-68183.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  ima: don't clear IMA_DIGSIG flag when setting or... | 7.8 | 0.0015 |  |
| [CVE-2026-43205](https://patchblox.com/security/data/cve/CVE-2026-43205.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  dpaa2-switch: validate num_ifs to prevent out-of... | 7.8 | 0.0014 |  |
| [CVE-2026-43027](https://patchblox.com/security/data/cve/CVE-2026-43027.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_conntrack_helper: pass helper to e... | 7.8 | 0.0013 |  |
| [CVE-2026-43020](https://patchblox.com/security/data/cve/CVE-2026-43020.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: MGMT: validate LTK enc_size on load... | 7.8 | 0.0013 |  |
| [CVE-2026-43006](https://patchblox.com/security/data/cve/CVE-2026-43006.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  io_uring/rsrc: reject zero-length fixed buffer i... | 7.5 | 0.0012 |  |
| [CVE-2026-23375](https://patchblox.com/security/data/cve/CVE-2026-23375.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: mm: thp: deny THP for files on anonymous inodes f... | 7.5 | 0.0012 |  |
| [CVE-2026-31684](https://patchblox.com/security/data/cve/CVE-2026-31684.md) | High | net: sched: act_csum: validate nested VLAN headers | 7.8 | 0.0012 |  |
| [CVE-2026-43116](https://patchblox.com/security/data/cve/CVE-2026-43116.md) | High | netfilter: ctnetlink: ensure safe access to master conntrack | 8.8 | 0.0010 |  |
| [CVE-2026-43023](https://patchblox.com/security/data/cve/CVE-2026-43023.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: fix race conditions in sco_sock_c... | 7.8 | 0.0010 |  |

---

Data as of 2026-11-07T18:46:35Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.