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CVE-2026-43046

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: reject root items with drop_progress and zero drop_level [BUG] When recovering relocation at mount time, merge_reloc_roo…

Published May 1, 2026CWE-617EPSS 0.16%

Overview

CVE-2026-43046 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject root items with drop_progress and zero drop_level

[BUG]

When recovering relocation at mount time, merge_reloc_root() and

btrfs_drop_snapshot() both use BUG_ON(level == 0) to guard against

an impossible state: a non-zero drop_progress combined with a zero

drop_level in a root_item, which can be triggered:

------------[ cut here ]------------

kernel BUG at fs/btrfs/relocation.c:1545!

Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI

CPU: 1 UID: 0 PID: 283 ... Tainted: 6.18.0+ #16 PREEMPT(voluntary)

Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE

Hardware name: QEMU Ubuntu 24.04 PC v2, BIOS 1.16.3-debian-1.16.3-2

RIP: 0010:merge_reloc_root+0x1266/0x1650 fs/btrfs/relocation.c:1545

Code: ffff0000 00004589 d7e9acfa ffffe8a1 79bafebe 02000000

Call Trace:

merge_reloc_roots+0x295/0x890 fs/btrfs/relocation.c:1861

btrfs_recover_relocation+0xd6e/0x11d0 fs/btrfs/relocation.c:4195

btrfs_start_pre_rw_mount+0xa4d/0x1810

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/295f8075d00442d71dc9ccae421ace1c0d2d9224Refgit.kernel.org/stable/c/53ceedd1eb6280ca8359664e0226983eded2ed73Refgit.kernel.org/stable/c/850de3d87f4720b71ccdcd44f4aa57e46b53a3f3Refgit.kernel.org/stable/c/ac68a9a8e481ab1becaed29d6d23087dac3de15dRefgit.kernel.org/stable/c/b17b79ff896305fd74980a5f72afec370ee88ca4Refgit.kernel.org/stable/c/bedaf7d0b9d793e116f16b4d9a7dbc94bcc80443Refgit.kernel.org/stable/c/de585ee18dd5601745f65a60fef7b7ceebd78c83

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43046?

CVE-2026-43046 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43046?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43046?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43046?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43046 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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