CVE-2026-89708: nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-13

Last Updated

2026-09-24

EPSS Score

0.44% (percentile: 38.6%)

Affected Products (3)

Open Source Software

• azl3 kernel 6.6.150.1-1 on Azure Linux 3.0
• azl3 kernel 6.6.152.1-1 on Azure Linux 3.0
• azl3 kernel 6.6.157.1-1 on Azure Linux 3.0

Security Updates (1)

• Security Update

Revision History

• 2026-09-13: Information published.
• 2026-09-14: Information published.
• 2026-09-23: Information published.
• 2026-09-24: Information published.