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CVE-2026-97562

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() ta…

Published Sep 25, 2026EPSS 0.41%

Overview

CVE-2026-97562 is a high-severity vulnerability. It was published on September 25, 2026 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:

smb: client: pin DFS superblock in iterator callback

tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super()

takes its active reference only after iterate_supers_type() has dropped

s_umount and its passive reference. Concurrent DFS automount expiry can

therefore free the superblock before cifs_sb_active() uses it.

A deterministic KASAN test reproduces the race as:

BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80

The same test passes with this change applied.

Take the active reference in the callback while iterate_supers_type()

still holds s_umount shared. cifs_put_tcp_super() remains the matching

release.

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/3c9acc9835c304013a4faeb969fe9333d66ca9f8Refgit.kernel.org/stable/c/5b01a8c0209690db75341528ec53fd87e0ac1460Refgit.kernel.org/stable/c/a6b6561522212af852c9ad8a7dca8d59ef2c7377Refgit.kernel.org/stable/c/d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818Refgit.kernel.org/stable/c/ea43a15cea36dc5ddd832be5bddeac7dd804cbcf

How CyberStrike helps

Frequently asked questions

What is CVE-2026-97562?

CVE-2026-97562 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-97562?

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-2026-97562?

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-2026-97562?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-97562 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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