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CVE-2026-53040

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate bg_bits during freefrag scan [BUG] A crafted filesystem can trigger an out-of-bounds bitmap walk when OCFS2_IOC…

Published Jun 24, 2026CWE-416EPSS 0.12%

Overview

CVE-2026-53040 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. 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:

ocfs2: validate bg_bits during freefrag scan

[BUG]

A crafted filesystem can trigger an out-of-bounds bitmap walk when

OCFS2_IOC_INFO is issued with OCFS2_INFO_FL_NON_COHERENT.

BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]

BUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]

BUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:21 [inline]

BUG: KASAN: use-after-free in ocfs2_info_freefrag_scan_chain fs/ocfs2/ioctl.c:495 [inline]

BUG: KASAN: use-after-free in ocfs2_info_freefrag_scan_bitmap fs/ocfs2/ioctl.c:588 [inline]

BUG: KASAN: use-after-free in ocfs2_info_handle_freefrag fs/ocfs2/ioctl.c:662 [inline]

BUG: KASAN: use-after-free in ocfs2_info_handle_request+0x1c66/0x3370 fs/ocfs2/ioctl.c:754

Read of size 8 at addr ffff888031bce000 by task syz.0.636/1435

Call Trace:

__dump_stack lib/dump_stack.c:

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/05d0cbea41167b6b061c6ba5b70ee5a9a7a24c9eRefgit.kernel.org/stable/c/0998674eec138c55e9e349b9cbd9dbc5129a9cc8Refgit.kernel.org/stable/c/3e167e230d19cd273108bab2e4c61800fc335ae8Refgit.kernel.org/stable/c/4c2d62ddde8928db12f4608950b67a20e67deab2Refgit.kernel.org/stable/c/8f687eeed3da3012152b0f9473f578869de0cd7bRefgit.kernel.org/stable/c/bb2906a1065ec28de021bac2ed03f2624edd7d07Refgit.kernel.org/stable/c/bb3c54d1e71578521111f1a1ee7d5f4761a242b8Refgit.kernel.org/stable/c/e0dcf12665d6dde37facf790803cdad44d5c328c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53040?

CVE-2026-53040 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-53040?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53040?

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-2026-53040?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53040 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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