Bottlerocket: bottlerocket-kernel-6.1, kernel-6.1: security update to 6.1.127

medium Tenable Self-Hosted Container Security Plugin ID 428157

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure
io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but
when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to
zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace
period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly
defer it another RCU grace period. (CVE-2025-21655)

Plugin Details

Severity: Medium

ID: 428157

Version: Revision 1.10

Type: Local

Family: Bottlerocket Local Security Checks

Published: 6/30/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2025-21655

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 1/20/2025

Reference Information

CVE: CVE-2025-21655

Detections

Analytics