CVE-2026-98017 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in net/sched caused by improper qdisc freeing after failed creation in clsact during RTM_NEWQDISC requests, letting attackers cause denial of service, exploit requires crafted netlink messages.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix for qdisc freeing after failed creation.

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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