CVE-2026-89836 Linux Kernel f2fs - Race Condition

Linux kernel f2fs contains a race condition caused by calling folio_nr_pages() after dropping folio reference in large folio invalidate, letting attackers cause livelock and stale xarray entries, exploit requires concurrent folio operations.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the Linux kernel version that includes the fix for folio_nr_pages() race in f2fs, such as v6.18 or later.

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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