Linux kernel RCE CVE-2026-98432
CVSSv3 Score: 9.8 CVE-2026-98432:ipv4: free inet_opt and ireq_opt after an RCU grace period tcp_v4_syn_recv_sock() transfers ownership of ireq->ireq_opt to the child socket (newinet->inet_opt) without copying it. Another cpu can concurrently process a retransmitted SYN for the same request socket, and send a SYNACK from tcp_check_req(). tcp_v4_send_synack() and inet_csk_route_req() read ireq->ireq_opt under rcu_read_lock() only, and ip_build_and_send_pkt() and ip_options_build() then read opt->optlen twice. Note that the SYNACK timer itself is not an issue: it holds a reference on its request socket, and inet_csk_reqsk_queue_drop() calls timer_delete_sync() before the child can be freed. Sin
Read at Fortinet PSIRT Advisories
- Vendor
- Fortinet, Linux kernel
- Product
- Linux kernel
- CVSS v3.0
- 9.8
- EPSS
- 0.005 (p40)
- Fix
- available
- Exposure class
- Operating system
Why it ranks 69 (High)
- CVSS v3.0 9.8 critical
- Product class: operating system
- Widely deployed vendor product (Fortinet)
- Covered by 5 independent sources
- Fix available
- Vendor security advisory
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- Fortinet PSIRT Advisories (fortiguard.fortinet.com)
- CVE-2026-98432 on this site · NVD · CVE.org · Vulnpedia
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