CVE-2026-89965 Linux Kernel - Out of Bounds Write

Linux kernel contains a buffer overflow caused by improper validation of the nfree field in nvdimm/btt arenas, letting attackers trigger out-of-bounds writes by crafting arenas with nfree below lane count, exploit requires crafted or foreign arena.

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

Details

Type
Out of Bounds Write
Impact
Out Of Bounds Rw
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 latest Linux kernel version containing the fix.

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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