CVE-2026-89692 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by improper clearing of CALLBACK_RUNNING flag in nfsd delegation recall queue, letting attackers cause delegation recall to stall, exploit requires triggering delegation recall failure.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for clearing CALLBACK_RUNNING flag on failed delegation recall queue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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