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CVE-2026-43458

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_w…

Published May 8, 2026CWE-416EPSS 0.17%

Overview

CVE-2026-43458 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

serial: caif: hold tty->link reference in ldisc_open and ser_release

A reproducer triggers a KASAN slab-use-after-free in pty_write_room()

when caif_serial's TX path calls tty_write_room(). The faulting access

is on tty->link->port.

Hold an extra kref on tty->link for the lifetime of the caif_serial line

discipline: get it in ldisc_open() and drop it in ser_release(), and

also drop it on the ldisc_open() error path.

With this change applied, the reproducer no longer triggers the UAF in

my testing.

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/23a3ac2e2262a291498567418227b99e1f3606b1Refgit.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98Refgit.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2aRefgit.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511cRefgit.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7dRefgit.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089Refgit.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7Refgit.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43458?

CVE-2026-43458 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43458?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-43458?

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-2026-43458?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43458 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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