CVE-2026-89789
Vulnerability Scoring
Analysis In Progress
CVE-2026-89789 Vulnerability Analysis & Exploit Details
CVE-2026-89789
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-89789 Details
Status: Received on 16 Sep 2026, 09:17 UTC
Published on: 16 Sep 2026, 09:17 UTC
CVSS Release:
CVE-2026-89789 Vulnerability Summary
CVE-2026-89789: 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().
Assessing the Risk of CVE-2026-89789
Access Complexity Graph
The exploitability of CVE-2026-89789 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-89789
No exploitability data is available for CVE-2026-89789.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-89789, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-89789, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-89789 does not compromise confidentiality.
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Integrity:
None
CVE-2026-89789 does not impact data integrity.
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Availability:
None
CVE-2026-89789 does not affect system availability.
CVE-2026-89789 References
External References
- https://git.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1
- https://git.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132af
- https://git.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5
- https://git.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafc
- https://git.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6ae
- https://git.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09e
- https://git.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973
- https://git.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337
CWE Common Weakness Enumeration
Unknown
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