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CVE-2026-89789

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free gtp_newlink()'s error path frees tid_hash and…

Published Sep 16, 2026EPSS 0.16%

Overview

CVE-2026-89789 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free

gtp_newlink()'s error path frees tid_hash and addr_hash without

waiting for an RCU grace period after clearing sk_user_data. A

concurrent gtp_encap_recv() in softirq may still hold the gtp_dev

pointer obtained via rcu_dereference_sk_user_data() and access the

freed memory.

BUG: KASAN: slab-use-after-free in gtp0_pdp_find+0x1f6/0x200 (gtp.c:152)

Call Trace:

<IRQ>

gtp0_pdp_find+0x1f6/0x200

gtp_encap_recv+0x527/0x24b0

udp_queue_rcv_one_skb+0x75f/0xc10

Add synchronize_net() before the kfree calls in out_hashtable, which

covers all error paths from both gtp_encap_enable() and

gtp_create_sockets().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1Refgit.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132afRefgit.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5Refgit.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafcRefgit.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6aeRefgit.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09eRefgit.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973Refgit.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89789?

CVE-2026-89789 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89789?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89789?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89789?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89789 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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