# RHSA-2026:20299: kernel security update

RHSA-2026:20299, released May 27, 2026, fixes 3 CVEs in kernel (version 6.12.0-55.75.1.el10_0). One of them is being exploited (CVE-2026-46300); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-20299
- Platform: Linux
- Released: May 27, 2026
- Priority: Patch now (Closes CVE-2026-46300, exploited (CISA KEV))
- CVEs: 3, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:20299

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 10 | 6.12.0-55.75.1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-46300](https://patchblox.com/security/data/cve/CVE-2026-46300.md) | Patch now | net: skbuff: preserve shared-frag marker during coalescing | 8.1 | 0.1613 | CISA KEV |
| [CVE-2026-46333](https://patchblox.com/security/data/cve/CVE-2026-46333.md) | High | ptrace: slightly saner 'get_dumpable()' logic | 8.1 | 0.0430 |  |
| [CVE-2026-43503](https://patchblox.com/security/data/cve/CVE-2026-43503.md) | High | net: skbuff: propagate shared-frag marker through frag-transfer helpers | 8.8 | 0.0199 |  |

---

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo