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Chainguard: linux-qemu-melange: security update to 6.18.49-r2

medium Tenable Self-Hosted Container Security Plugin ID 472541

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: mm/damon/core: fix damos_walk() vs
 kdamond_fn() exit race When kdamond_fn() main loop is finished, the function cancels remaining
 damos_walk() request and unset the damon_ctx->kdamond so that API callers and API functions themselves can
 show the context is terminated. damos_walk() adds the caller's request to the queue first. After that, it
 shows if the kdamond of the damon_ctx is still running (damon_ctx->kdamond is set). Only if the kdamond is
 running, damos_walk() starts waiting for the kdamond's handling of the newly added request. The
 damos_walk() requests registration and damon_ctx->kdamond unset are protected by different mutexes,
 though. Hence, damos_walk() could race with damon_ctx->kdamond unset, and result in deadlocks. For
 example, let's suppose kdamond successfully finished the damow_walk() request cancelling. Right after
 that, damos_walk() is called for the context. It registers the new request, and shows the context is still
 running, because damon_ctx->kdamond unset is not yet done. Hence the damos_walk() caller starts waiting
 for the handling of the request. However, the kdamond is already on the termination steps, so it never
 handles the new request. As a result, the damos_walk() caller thread infinitely waits. Fix this by
 introducing another damon_ctx field, namely walk_control_obsolete. It is protected by the
 damon_ctx->walk_control_lock, which protects damos_walk() request registration. Initialize (unset) it in
 kdamond_fn() before letting damon_start() returns and set it just before the cancelling of the remaining
 damos_walk() request is executed. damos_walk() reads the obsolete field under the lock and avoids adding a
 new request. After this change, only requests that are guaranteed to be handled or cancelled are
 registered. Hence the after-registration DAMON context termination check is no longer needed. Remove it
 together. The issue is found by sashiko [1]. (CVE-2026-46008)

Solution

Update the linux-qemu-melange library and its related packages to version 6.18.49-r2 or later.

Plugin Details

Severity: Medium

ID: 472541

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.44

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-2026-46008

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: 5/27/2026

Reference Information

CVE: CVE-2026-46008