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CVE-2026-43288

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ext4: move ext4_percpu_param_init() before ext4_mb_init() When running `kvm-xfstests -c ext4/1k -C 1 generic/383` with the `DOU…

Published May 8, 2026CWE-908EPSS 0.17%

Overview

CVE-2026-43288 is a medium-severity vulnerability. It was published on May 8, 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:

ext4: move ext4_percpu_param_init() before ext4_mb_init()

When running `kvm-xfstests -c ext4/1k -C 1 generic/383` with the

`DOUBLE_CHECK` macro defined, the following panic is triggered:

==================================================================

EXT4-fs error (device vdc): ext4_validate_block_bitmap:423:

comm mount: bg 0: bad block bitmap checksum

BUG: unable to handle page fault for address: ff110000fa2cc000

PGD 3e01067 P4D 3e02067 PUD 0

Oops: Oops: 0000 [#1] SMP NOPTI

CPU: 0 UID: 0 PID: 2386 Comm: mount Tainted: G W

6.18.0-gba65a4e7120a-dirty #1152 PREEMPT(none)

RIP: 0010:percpu_counter_add_batch+0x13/0xa0

Call Trace:

<TASK>

ext4_mark_group_bitmap_corrupted+0xcb/0xe0

ext4_validate_block_bitmap+0x2a1/0x2f0

ext4_read_block_bitmap+0x33/0x50

mb_group_bb_bitmap_alloc+0x33/0x80

ext4_mb_add_groupinfo+0x190/0x250

ext4_mb_init_backend+0x87/0x290

ext4_mb_init+0

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/0d5fcb063cdabb9aeaa8554b7fedad2092c4150eRefgit.kernel.org/stable/c/270564513489d98b721a1e4a10017978d5213bffRefgit.kernel.org/stable/c/9e9fb259bcddf459a0168f4a964e979e500a68a5Refgit.kernel.org/stable/c/aec095f3cc6cf209effd93278ce35be27db81d73Refgit.kernel.org/stable/c/bf5b609524497c195f801cd5707252384aed8149

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43288?

CVE-2026-43288 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43288?

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-2026-43288?

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-2026-43288?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43288 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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