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

medium Tenable Cloud Security Plugin ID 472557

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: netfilter: x_tables: allocate hook ops
 while under mutex arp/ip(6)t_register_table() add the table to the per-netns list via xt_register_table()
 before allocating the per-netns hook ops copy via kmemdup_array(). This leaves a window where the table is
 visible in the list with ops=NULL. If the pernet exit happens runs concurrently the pre_exit callback
 finds the table via xt_find_table() and passes the NULL ops pointer to nf_unregister_net_hooks(), causing
 a NULL dereference: general protection fault in nf_unregister_net_hooks+0xbc/0x150 RIP:
 nf_unregister_net_hooks (net/netfilter/core.c:613) Call Trace: ipt_unregister_table_pre_exit
 iptable_mangle_net_pre_exit ops_pre_exit_list cleanup_net Fix by moving the ops allocation into the
 xtables core so the table is never in the list without valid ops. Also ensure the table is no longer
 processing packets before its torn down on error unwind. nf_register_net_hooks might have published at
 least one hook; call synchronize_rcu() if there was an error. audit log register message gets deferred
 until all operations have passed, this avoids need to emit another ureg message in case of error
 unwinding. Based on earlier patch by Tristan Madani. (CVE-2026-64079)

Solution

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

Plugin Details

Severity: Medium

ID: 472557

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.64

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-2026-64079

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: 7/19/2026

Reference Information

CVE: CVE-2026-64079