CVE-2026-98374
Vulnerability Scoring
Analysis In Progress
CVE-2026-98374 Vulnerability Analysis & Exploit Details
CVE-2026-98374
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-2026-98374 Details
Status: Received on 07 Oct 2026, 13:17 UTC
Published on: 07 Oct 2026, 13:17 UTC
CVSS Release:
CVE-2026-98374 Vulnerability Summary
CVE-2026-98374: In the Linux kernel, the following vulnerability has been resolved: tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() When tcp_send_synack() replaces the cloned SYN skb at the head of the retransmit queue with a copy, it frees the original with tcp_rtx_queue_unlink_and_free() and only repairs tp->highest_sack. tp->retransmit_skb_hint keeps pointing at the freed skbuff_fclone_cache object. The dangling hint is read in tcp_verify_retransmit_hint() and used as the root of the rbtree walk in tcp_xmit_retransmit_queue(). An unprivileged TFO client (sendmsg(MSG_FASTOPEN)) can arm the hint with an attacker-supplied ICMP fragmentation-needed message, after which a simultaneous open frees the armed SYN skb: BUG: KASAN: slab-use-after-free in tcp_mark_skb_lost (net/ipv4/tcp_input.c:1316) Read of size 4 at addr ffff88800604d928 by task swapper/1/0 Call Trace: tcp_mark_skb_lost (net/ipv4/tcp_input.c:1316) tcp_simple_retransmit (net/ipv4/tcp_input.c:3158) tcp_v4_err (net/ipv4/tcp_ipv4.c:587) Sync the hint to the copy.
Assessing the Risk of CVE-2026-98374
Access Complexity Graph
The exploitability of CVE-2026-98374 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-2026-98374
No exploitability data is available for CVE-2026-98374.
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-2026-98374, 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-2026-98374, 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-2026-98374 does not compromise confidentiality.
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Integrity:
None
CVE-2026-98374 does not impact data integrity.
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Availability:
None
CVE-2026-98374 does not affect system availability.
CVE-2026-98374 References
External References
- https://git.kernel.org/stable/c/0f87720c7e4bcab07c24888b3cf12bfe857bb90e
- https://git.kernel.org/stable/c/631aa4cb45099f09e9385dd786bd291c6270bfc4
- https://git.kernel.org/stable/c/71d45049b0d631dfdbf3c65305f7fca676de023b
- https://git.kernel.org/stable/c/c5b4da1f403a658c1c19766be2b426003ada419f
- https://git.kernel.org/stable/c/e3ea71cb1408a013ed4e8a757b815f1a919324bd
- https://git.kernel.org/stable/c/fad6d429651e748365e93ca54645accc212f0018
- https://git.kernel.org/stable/c/fe99bbeee5c5dbd3abc30721a8079ced59649d97
CWE Common Weakness Enumeration
Unknown
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