# RHSA-2026:0271: kernel security update

RHSA-2026:0271, released October 15, 2025, fixes 8 CVEs in kernel (version 6.12.0-55.52.1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-0271
- Platform: Linux
- Released: Oct 15, 2025
- Priority: Urgent (Closes CVE-2025-39925, rated Critical)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:0271

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 10 | 6.12.0-55.52.1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-39925](https://patchblox.com/security/data/cve/CVE-2025-39925.md) | Urgent | can: j1939: implement NETDEV_UNREGISTER notification handler | 9.8 | 0.0015 |  |
| [CVE-2025-40300](https://patchblox.com/security/data/cve/CVE-2025-40300.md) | High | x86/vmscape: Add conditional IBPB mitigation | 7.3 | 0.0038 |  |
| [CVE-2025-39982](https://patchblox.com/security/data/cve/CVE-2025-39982.md) | High | Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync | 8.8 | 0.0028 |  |
| [CVE-2025-39983](https://patchblox.com/security/data/cve/CVE-2025-39983.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: hci_event: Fix UAF in hci_conn_tx_deq... | 8.8 | 0.0025 |  |
| [CVE-2025-39806](https://patchblox.com/security/data/cve/CVE-2025-39806.md) | High | kernel-64k-core: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: H... | 7.8 | 0.0024 |  |
| [CVE-2025-39883](https://patchblox.com/security/data/cve/CVE-2025-39883.md) | High | mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory | 7.6 | 0.0016 |  |
| [CVE-2025-39981](https://patchblox.com/security/data/cve/CVE-2025-39981.md) | High | Bluetooth: MGMT: Fix possible UAFs | 7.8 | 0.0015 |  |
| [CVE-2025-39843](https://patchblox.com/security/data/cve/CVE-2025-39843.md) | High | mm: slub: avoid wake up kswapd in set_track_prepare | 7.8 | 0.0012 |  |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo