Answer in brief
CVE-2026-98432 records a Unknown severity vulnerability in ipv4: free inet_opt and ireq_opt after an RCU grace period. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=079096f103faca2dd87342cca6f23d4b34da8871 <11a03ce3c4a62d84c10ccdfe47f8075006498568 || >=079096f103faca2dd87342cca6f23d4b34da8871 <a47406c769f72c070386985488f1c4d057df86b2 || >=079096f103faca2dd87342cca6f23d4b34da8871 <26d4c36d318cffbbd160884a0e4cec0da4da4936 || >=079096f103faca2dd87342cca6f23d4b34da8871 <e3f33b0a1d89d738e2b913dab519226eaf76e15b | 11a03ce3c4a62d84c10ccdfe47f8075006498568, a47406c769f72c070386985488f1c4d057df86b2, 26d4c36d318cffbbd160884a0e4cec0da4da4936, e3f33b0a1d89d738e2b913dab519226eaf76e15b |
| Linux/Linuxgeneric | 4.4 | Not reported |
| Linux/Linuxgeneric | >=079096f103faca2dd87342cca6f23d4b34da8871 <b3b027ef0cd322bfa839b9aaf5b27551eea54cf6 || >=079096f103faca2dd87342cca6f23d4b34da8871 <95a8c8fa9f27dce64c40c41c062de7728bf34ab5 || >=079096f103faca2dd87342cca6f23d4b34da8871 <89b5b1eb7d633c33832b7ff2c02e19a144705036 || >=079096f103faca2dd87342cca6f23d4b34da8871 <742f73df544e03744f2981c467d6542fe8172a2a || >=079096f103faca2dd87342cca6f23d4b34da8871 <11a03ce3c4a62d84c10ccdfe47f8075006498568 || >=079096f103faca2dd87342cca6f23d4b34da8871 <a47406c769f72c070386985488f1c4d057df86b2 || >=079096f103faca2dd87342cca6f23d4b34da8871 <26d4c36d318cffbbd160884a0e4cec0da4da4936 || >=079096f103faca2dd87342cca6f23d4b34da8871 <e3f33b0a1d89d738e2b913dab519226eaf76e15b | b3b027ef0cd322bfa839b9aaf5b27551eea54cf6, 95a8c8fa9f27dce64c40c41c062de7728bf34ab5, 89b5b1eb7d633c33832b7ff2c02e19a144705036, 742f73df544e03744f2981c467d6542fe8172a2a, 11a03ce3c4a62d84c10ccdfe47f8075006498568, a47406c769f72c070386985488f1c4d057df86b2, 26d4c36d318cffbbd160884a0e4cec0da4da4936, e3f33b0a1d89d738e2b913dab519226eaf76e15b |
Published upstream
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
In the Linux kernel, the following vulnerability has been resolved: 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. Since commit 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table"), request sockets are processed without holding the listener lock, so nothing prevents the child socket from being freed while the SYNACK is still being built. TCP child sockets do not have SOCK_RCU_FREE, and inet_sock_destruct() frees inet_opt with a plain kfree(), leading to a use-after-free in ip_options_build(). A similar issue exists with request socket migration (net.ipv4.tcp_migrate_req=1, or a BPF_SK_REUSEPORT_SELECT_OR_MIGRATE program). reqsk_timer_handler() clones the request socket with inet_reqsk_clone(), so that the old request socket and its clone share the same ireq_opt, then reqsk_migrate_reset() clears the pointer in the old one. Another cpu holding a reference on the old request socket can still be using these options (sending a SYNACK, or creating a child in tcp_v4_syn_recv_sock()) when the clone is freed, and tcp_v4_reqsk_destructor() also uses a plain kfree(). Readers already use RCU, and other paths replacing inet_opt (do_ip_setsockopt(), cipso_v4_sock_setattr()...) already use kfree_rcu(). Use kfree_rcu() in inet_sock_destruct() and tcp_v4_reqsk_destructor() as well. IPv6 is not affected by the first issue, because tcp_v6_syn_recv_sock() duplicates the options. tcp_v6_reqsk_destructor() has the same migration issue with ipv6_opt, which is only set by CALIPSO. This will be addressed in a separate patch.
Quoted source text, attributed separately from HOL analysis.