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CVE-2026-43071

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: dcache: Limit the minimal number of bucket to two There is an OOB read problem on dentry_hashtable when user sets 'dhash_entrie…

Published May 5, 2026CWE-125EPSS 0.46%

Overview

CVE-2026-43071 is a critical-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

dcache: Limit the minimal number of bucket to two

There is an OOB read problem on dentry_hashtable when user sets

'dhash_entries=1':

BUG: unable to handle page fault for address: ffff888b30b774b0

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

Oops: Oops: 0000 [#1] SMP PTI

RIP: 0010:__d_lookup+0x56/0x120

Call Trace:

d_lookup.cold+0x16/0x5d

lookup_dcache+0x27/0xf0

lookup_one_qstr_excl+0x2a/0x180

start_dirop+0x55/0xa0

simple_start_creating+0x8d/0xa0

debugfs_start_creating+0x8c/0x180

debugfs_create_dir+0x1d/0x1c0

pinctrl_init+0x6d/0x140

do_one_initcall+0x6d/0x3d0

kernel_init_freeable+0x39f/0x460

kernel_init+0x2a/0x260

There will be only one bucket in dentry_hashtable when dhash_entries is

set as one, and d_hash_shift is calculated as 32 by dcache_init(). Then,

following process will access more than one buckets(which memory r

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/277cedabb0ab86baae83fa58218be13c6d3e5526Refgit.kernel.org/stable/c/426ef05e82ee52c8d0e95fc0808b7383d8352d73Refgit.kernel.org/stable/c/45b06bb5ea96f75ad81d7ef446f832ea6b0026feRefgit.kernel.org/stable/c/5718df131ab78897a9dd1f2e71c3ba732d4392afRefgit.kernel.org/stable/c/755b40903eff563768d4d96fd4ef51ec48adde3bRefgit.kernel.org/stable/c/ddd57ebce245f9c7e2f6902a6c087d6186d2385dRefgit.kernel.org/stable/c/f08fe8891c3eeb63b73f9f1f6d97aa629c821579

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43071?

CVE-2026-43071 is a critical-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-43071?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43071?

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-2026-43071?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43071 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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