CVE-2026-89561 Linux Kernel - Denial of Service

Linux kernel contains a NULL pointer dereference vulnerability in ipv6_rpl_srh_rcv() caused by missing NULL check on idev from __in6_dev_get(), letting attackers cause kernel crash via MTU flapping and ping6 traffic, exploit requires network access to affected interface.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
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 Linux kernel version 7.2.0-rc7 or later where the NULL dereference is fixed

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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