CVE-2026-89743 Linux kernel misc: nsm - Information Disclosure

Linux kernel misc: nsm contains an out-of-bounds read caused by unbounded device-reported response length in nsm_sendrecv_msg_locked(), letting malicious backends disclose adjacent kernel heap, exploit requires malicious or buggy backend device.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix for bounded response length in nsm_sendrecv_msg_locked().

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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