CVE-2026-89476 Linux Kernel - Integer Overflow

Linux kernel contains an integer underflow caused by duplicate SCTP RECONF responses processing the same ADD_OUT request multiple times, letting attackers potentially cause memory corruption, exploit requires sending duplicate RECONF responses.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.70% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
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 with the SCTP RECONF 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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