# RHSA-2026:1727: kernel security update

RHSA-2026:1727, released December 16, 2025, fixes 16 CVEs in kernel (version 6.12.0-55.58.1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-1727
- Platform: Linux
- Released: Dec 16, 2025
- Priority: Urgent (Closes CVE-2025-40251, rated Critical)
- CVEs: 16, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:1727

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 10 | 6.12.0-55.58.1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-40251](https://patchblox.com/security/data/cve/CVE-2025-40251.md) | Urgent | devlink: rate: Unset parent pointer in devl_rate_nodes_destroy | 9.8 | 0.0017 |  |
| [CVE-2025-40240](https://patchblox.com/security/data/cve/CVE-2025-40240.md) | High | sctp: avoid NULL dereference when chunk data buffer is missing | 8.6 | 0.0064 |  |
| [CVE-2025-40133](https://patchblox.com/security/data/cve/CVE-2025-40133.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  mptcp: Use __sk_dst_get() and dst_dev_rcu() in m... | 8.1 | 0.0051 |  |
| [CVE-2025-40258](https://patchblox.com/security/data/cve/CVE-2025-40258.md) | High | mptcp: fix race condition in mptcp_schedule_work() | 9.8 | 0.0050 |  |
| [CVE-2025-68301](https://patchblox.com/security/data/cve/CVE-2025-68301.md) | High | net: atlantic: fix fragment overflow handling in RX path | 9.8 | 0.0047 |  |
| [CVE-2025-39933](https://patchblox.com/security/data/cve/CVE-2025-39933.md) | High | smb: client: let recv_done verify data_offset, data_length and remaining_data_length | 7.8 | 0.0035 |  |
| [CVE-2023-53034](https://patchblox.com/security/data/cve/CVE-2023-53034.md) | High | ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans | 7.5 | 0.0029 |  |
| [CVE-2025-40301](https://patchblox.com/security/data/cve/CVE-2025-40301.md) | High | Bluetooth: hci_event: validate skb length for unknown CC opcode | 7.8 | 0.0027 |  |
| [CVE-2025-40318](https://patchblox.com/security/data/cve/CVE-2025-40318.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: hci_sync: fix race in hci_cmd_sync_de... | 8.8 | 0.0027 |  |
| [CVE-2025-38453](https://patchblox.com/security/data/cve/CVE-2025-38453.md) | High | kernel-abi-stablelists: The kernel packages contain the Linux kernel, the core of any Linux operating system | 7.8 | 0.0019 |  |
| [CVE-2025-38172](https://patchblox.com/security/data/cve/CVE-2025-38172.md) | High | kernel-abi-stablelists: The kernel packages contain the Linux kernel, the core of any Linux operating system | 7.8 | 0.0018 |  |
| [CVE-2025-38568](https://patchblox.com/security/data/cve/CVE-2025-38568.md) | High | net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing | 7.8 | 0.0018 |  |
| [CVE-2025-40248](https://patchblox.com/security/data/cve/CVE-2025-40248.md) | High | vsock: Ignore signal/timeout on connect() if already established | 7.8 | 0.0017 |  |
| [CVE-2025-40047](https://patchblox.com/security/data/cve/CVE-2025-40047.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved:  io_uring/waitid: always prune wait queue entry i... | 7.8 | 0.0016 |  |
| [CVE-2025-40304](https://patchblox.com/security/data/cve/CVE-2025-40304.md) | High | fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds | 7.8 | 0.0014 |  |
| [CVE-2025-40322](https://patchblox.com/security/data/cve/CVE-2025-40322.md) | High | fbdev: bitblit: bound-check glyph index in bit_putcs* | 7.8 | 0.0014 |  |

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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

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