Bottlerocket: kernel-5.15, kernel-6.1: security update to 2.4.0

medium Tenable Cloud Security Plugin ID 427974

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: perf: Fix event leak upon exit When a
task is scheduled out, pending sigtrap deliveries are deferred to the target task upon resume to userspace
via task_work. However failures while adding an event's callback to the task_work engine are ignored. And
since the last call for events exit happen after task work is eventually closed, there is a small window
during which pending sigtrap can be queued though ignored, leaking the event refcount addition such as in
the following scenario: TASK A ----- do_exit() exit_task_work(tsk); <IRQ> perf_event_overflow()
event->pending_sigtrap = pending_id; irq_work_queue(&event->pending_irq); </IRQ> =========> PREEMPTION:
TASK A -> TASK B event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount)
// FAILS: task work has exited task_work_add(&event->pending_task) [...] <IRQ WORK> perf_pending_irq() //
early return: event->oncpu = -1 </IRQ WORK> [...] =========> TASK B -> TASK A perf_event_exit_task(tsk)
perf_event_exit_event() free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // leak event
due to unexpected refcount == 2 As a result the event is never released while the task exits. Fix this
with appropriate task_work_add()'s error handling. (CVE-2024-43870)

Plugin Details

Severity: Medium

ID: 427974

Version: Revision 1.3

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: 23.15

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2024-43870

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/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: 8/21/2024

Reference Information

CVE: CVE-2024-43870

Detections

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