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CVE-2023-53491

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: start_kernel: Add __no_stack_protector function attribute Back during the discussion of commit a9a3ed1eff36 ("x86: Fix early bo…

Published Oct 1, 2025EPSS 0.36%

Overview

CVE-2023-53491 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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:

start_kernel: Add __no_stack_protector function attribute

Back during the discussion of

commit a9a3ed1eff36 ("x86: Fix early boot crash on gcc-10, third try")

we discussed the need for a function attribute to control the omission

of stack protectors on a per-function basis; at the time Clang had

support for no_stack_protector but GCC did not. This was fixed in

gcc-11. Now that the function attribute is available, let's start using

it.

Callers of boot_init_stack_canary need to use this function attribute

unless they're compiled with -fno-stack-protector, otherwise the canary

stored in the stack slot of the caller will differ upon the call to

boot_init_stack_canary. This will lead to a call to __stack_chk_fail()

then panic.

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/25e73018b4093e0cfbcec5dc4a4bb86d0b69ed56Refgit.kernel.org/stable/c/514ca14ed5444b911de59ed3381dfd195d99fe4b

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53491?

CVE-2023-53491 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-53491?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-53491?

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-2023-53491?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53491 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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