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

high Tenable Cloud Security Plugin ID 473073

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: afs: Fix the locking used by
 afs_get_link() The afs filesystem in the kernel doesn't do locking correctly for symbolic links. There are
 a number of problems: (1) It doesn't do any locking around afs_read_single() to prevent races between
 multiple ->get_link() calls, thereby allowing the possibility of leaks. (2) It doesn't use RCU barriering
 when accessing the buffer pointers during RCU pathwalk. (3) It can race with another thread updating the
 contents of the symlink if a third party updated it on the server. Fix this by the following means: (0)
 Move symlink handling into its own file as this makes it more complicated. (1) Take the validate_lock
 around afs_read_single() to prevent races between multiple ->get_link() calls. (2) Keep a separate copy of
 the symlink contents with an rcu_head. This is always going to be a lot smaller than a page, so it can be
 kmalloc'd and save quite a bit of memory. It also needs a refcount for non-RCU pathwalk. (3) Split the
 symlink read and write-to-cache routines in afs from those for directories. (4) Discard the I/O buffer as
 soon as the write-to-cache completes as this is a full page (plus a folio_queue). (5) If there's no cache,
 discard the I/O buffer immediately after reading and copying if there is no cache. (CVE-2026-64057)

Solution

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

Plugin Details

Severity: High

ID: 473073

Version: Revision 1.1

Type: Local

Published: 10/6/2026

Updated: 10/6/2026

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.86

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-64057

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 7/19/2026

Reference Information

CVE: CVE-2026-64057