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CVE-2026-53343

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from VM…

Published Jul 1, 2026EPSS 0.13%

Overview

CVE-2026-53343 is a medium-severity vulnerability. It was published on July 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:

ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow

Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from

VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in

__switch_to(). The read uses ldr, but the KASAN shadow address is

byte-granular and is not guaranteed to be word aligned.

ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and

CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()

with an alignment exception before reaching init.

Use ldrb for the dummy shadow access. The code only needs to fault in the

shadow mapping if the stack shadow is missing, so a byte load is sufficient

and matches the granularity of KASAN shadow memory.

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/2a4dc9a0ac3326e79fb58fdaae724b92127709a9Refgit.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88eRefgit.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6Refgit.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4Refgit.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2Refgit.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53343?

CVE-2026-53343 is a medium-severity vulnerability. It was published on July 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53343?

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-2026-53343?

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-2026-53343?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53343 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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