CVE-2026-89789 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in gtp_newlink() caused by freeing tid_hash and addr_hash without waiting for RCU grace period, letting attackers cause memory corruption via concurrent gtp_encap_recv(), exploit requires triggering error path.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Remote Code Execution, 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
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix that adds synchronize_net() in gtp_newlink() error path.

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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