CVE-2026-90413 Linux Kernel - Out-of-Bounds Read

Linux kernel contains a buffer over-read vulnerability in IB/isert due to accepting login PDUs declaring more data than received, letting remote attackers cause out-of-bounds read, exploit requires crafted login PDUs with mismatched declared length.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.82% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for IB/isert login PDU length validation.

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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