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

medium Tenable Cloud Security Plugin ID 472554

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: btrfs: do not ASSERT() when the fs
 flips RO inside btrfs_repair_io_failure() [BUG] There is a bug report that when btrfs hits ENOSPC error in
 a critical path, btrfs flips RO (this part is expected, although the ENOSPC bug still needs to be
 addressed). The problem is after the RO flip, if there is a read repair pending, we can hit the ASSERT()
 inside btrfs_repair_io_failure() like the following: BTRFS info (device vdc): relocating block group
 30408704 flags metadata|raid1 ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28)
 WARNING: fs/btrfs/extent-tree.c:3235 at __btrfs_free_extent.isra.0+0x453/0xfd0, CPU#1: btrfs/383844
 Modules linked in: kvm_intel kvm irqbypass [...] ---[ end trace 0000000000000000 ]--- BTRFS info (device
 vdc state EA): 2 enospc errors during balance BTRFS info (device vdc state EA): balance: ended with
 status: -30 BTRFS error (device vdc state EA): parent transid verify failed on logical 30556160 mirror 2
 wanted 8 found 6 BTRFS error (device vdc state EA): bdev /dev/nvme0n1 errs: wr 0, rd 0, flush 0, corrupt
 10, gen 0 [...] assertion failed: !(fs_info->sb->s_flags & SB_RDONLY) :: 0, in fs/btrfs/bio.c:938
 ------------[ cut here ]------------ assertion failed: !(fs_info->sb->s_flags & SB_RDONLY) :: 0, in
 fs/btrfs/bio.c:938 kernel BUG at fs/btrfs/bio.c:938! Oops: invalid opcode: 0000 [#1] SMP NOPTI CPU: 0 UID:
 0 PID: 868 Comm: kworker/u8:13 Tainted: G W N 6.19.0-rc6+ #4788 PREEMPT(full) Tainted: [W]=WARN, [N]=TEST
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org
 04/01/2014 Workqueue: btrfs-endio simple_end_io_work RIP: 0010:btrfs_repair_io_failure.cold+0xb2/0x120
 RSP: 0000:ffffc90001d2bcf0 EFLAGS: 00010246 RAX: 0000000000000051 RBX: 0000000000001000 RCX:
 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8305cf42 RDI: 00000000ffffffff RBP: 0000000000000002
 R08: 00000000fffeffff R09: ffffffff837fa988 R10: ffffffff8327a9e0 R11: 6f69747265737361 R12:
 ffff88813018d310 R13: ffff888168b8a000 R14: ffffc90001d2bd90 R15: ffff88810a169000 FS:
 0000000000000000(0000) GS:ffff8885e752c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0:
 0000000080050033 ------------[ cut here ]------------ [CAUSE] The cause of -ENOSPC error during the test
 case btrfs/124 is still unknown, although it's known that we still have cases where metadata can be over-
 committed but can not be fulfilled correctly, thus if we hit such ENOSPC error inside a critical path, we
 have no choice but abort the current transaction. This will mark the fs read-only. The problem is inside
 the btrfs_repair_io_failure() path that we require the fs not to be mount read-only. This is normally
 fine, but if we are doing a read-repair meanwhile the fs flips RO due to a critical error, we can enter
 btrfs_repair_io_failure() with super block set to read-only, thus triggering the above crash. [FIX] Just
 replace the ASSERT() with a proper return if the fs is already read-only. (CVE-2026-43299)

Solution

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

Plugin Details

Severity: Medium

ID: 472554

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.51

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-2026-43299

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: 5/8/2026

Reference Information

CVE: CVE-2026-43299