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

medium Tenable Cloud Security Plugin ID 472555

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: bpf: Do not allow deleting local
 storage in NMI Currently, local storage may deadlock when deferring freeing selem or local storage through
 kfree_rcu(), call_rcu() or call_rcu_tasks_trace() in NMI or reentrant. Since deleting selem in NMI is an
 unlikely use case, partially mitigate it by returning error when calling from bpf_xxx_storage_delete()
 helpers in NMI. Note that, it is still possible to deadlock through reentrant. A full mitigation requires
 returning error when irqs_disabled() is true, which, however is too heavy-handed for
 bpf_xxx_storage_delete(). The long-term solution requires _nolock versions of call_rcu. Another possible
 solution is to defer the free through irq_work [0], but it would grow the size of selem, which is non-
 ideal. The check is only needed in bpf_selem_unlink(), which is used by helpers and syscalls.
 bpf_selem_unlink_nofail() is fine as it is called during map and owner tear down that never run in NMI or
 reentrant. [0] https://lore.kernel.org/bpf/[email protected]/
 (CVE-2026-53106)

Solution

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

Plugin Details

Severity: Medium

ID: 472555

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.7

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-2026-53106

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: 6/24/2026

Reference Information

CVE: CVE-2026-53106