{"id":"CVE-2025-40000","summary":"wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()\n\nThere is a bug observed when rtw89_core_tx_kick_off_and_wait() tries to\naccess already freed skb_data:\n\n BUG: KFENCE: use-after-free write in rtw89_core_tx_kick_off_and_wait drivers/net/wireless/realtek/rtw89/core.c:1110\n\n CPU: 6 UID: 0 PID: 41377 Comm: kworker/u64:24 Not tainted  6.17.0-rc1+ #1 PREEMPT(lazy)\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS edk2-20250523-14.fc42 05/23/2025\n Workqueue: events_unbound cfg80211_wiphy_work [cfg80211]\n\n Use-after-free write at 0x0000000020309d9d (in kfence-#251):\n rtw89_core_tx_kick_off_and_wait drivers/net/wireless/realtek/rtw89/core.c:1110\n rtw89_core_scan_complete drivers/net/wireless/realtek/rtw89/core.c:5338\n rtw89_hw_scan_complete_cb drivers/net/wireless/realtek/rtw89/fw.c:7979\n rtw89_chanctx_proceed_cb drivers/net/wireless/realtek/rtw89/chan.c:3165\n rtw89_chanctx_proceed drivers/net/wireless/realtek/rtw89/chan.h:141\n rtw89_hw_scan_complete drivers/net/wireless/realtek/rtw89/fw.c:8012\n rtw89_mac_c2h_scanofld_rsp drivers/net/wireless/realtek/rtw89/mac.c:5059\n rtw89_fw_c2h_work drivers/net/wireless/realtek/rtw89/fw.c:6758\n process_one_work kernel/workqueue.c:3241\n worker_thread kernel/workqueue.c:3400\n kthread kernel/kthread.c:463\n ret_from_fork arch/x86/kernel/process.c:154\n ret_from_fork_asm arch/x86/entry/entry_64.S:258\n\n kfence-#251: 0x0000000056e2393d-0x000000009943cb62, size=232, cache=skbuff_head_cache\n\n allocated by task 41377 on cpu 6 at 77869.159548s (0.009551s ago):\n __alloc_skb net/core/skbuff.c:659\n __netdev_alloc_skb net/core/skbuff.c:734\n ieee80211_nullfunc_get net/mac80211/tx.c:5844\n rtw89_core_send_nullfunc drivers/net/wireless/realtek/rtw89/core.c:3431\n rtw89_core_scan_complete drivers/net/wireless/realtek/rtw89/core.c:5338\n rtw89_hw_scan_complete_cb drivers/net/wireless/realtek/rtw89/fw.c:7979\n rtw89_chanctx_proceed_cb drivers/net/wireless/realtek/rtw89/chan.c:3165\n rtw89_chanctx_proceed drivers/net/wireless/realtek/rtw89/chan.c:3194\n rtw89_hw_scan_complete drivers/net/wireless/realtek/rtw89/fw.c:8012\n rtw89_mac_c2h_scanofld_rsp drivers/net/wireless/realtek/rtw89/mac.c:5059\n rtw89_fw_c2h_work drivers/net/wireless/realtek/rtw89/fw.c:6758\n process_one_work kernel/workqueue.c:3241\n worker_thread kernel/workqueue.c:3400\n kthread kernel/kthread.c:463\n ret_from_fork arch/x86/kernel/process.c:154\n ret_from_fork_asm arch/x86/entry/entry_64.S:258\n\n freed by task 1045 on cpu 9 at 77869.168393s (0.001557s ago):\n ieee80211_tx_status_skb net/mac80211/status.c:1117\n rtw89_pci_release_txwd_skb drivers/net/wireless/realtek/rtw89/pci.c:564\n rtw89_pci_release_tx_skbs.isra.0 drivers/net/wireless/realtek/rtw89/pci.c:651\n rtw89_pci_release_tx drivers/net/wireless/realtek/rtw89/pci.c:676\n rtw89_pci_napi_poll drivers/net/wireless/realtek/rtw89/pci.c:4238\n __napi_poll net/core/dev.c:7495\n net_rx_action net/core/dev.c:7557 net/core/dev.c:7684\n handle_softirqs kernel/softirq.c:580\n do_softirq.part.0 kernel/softirq.c:480\n __local_bh_enable_ip kernel/softirq.c:407\n rtw89_pci_interrupt_threadfn drivers/net/wireless/realtek/rtw89/pci.c:927\n irq_thread_fn kernel/irq/manage.c:1133\n irq_thread kernel/irq/manage.c:1257\n kthread kernel/kthread.c:463\n ret_from_fork arch/x86/kernel/process.c:154\n ret_from_fork_asm arch/x86/entry/entry_64.S:258\n\nIt is a consequence of a race between the waiting and the signaling side\nof the completion:\n\n            Waiting thread                            Completing thread\n\nrtw89_core_tx_kick_off_and_wait()\n  rcu_assign_pointer(skb_data-\u003ewait, wait)\n  /* start waiting */\n  wait_for_completion_timeout()\n                                                rtw89_pci_tx_status()\n                                                  rtw89_core_tx_wait_complete()\n                                                    rcu_read_lock()\n                                                    /* signals completion and\n   \n---truncated---","modified":"2026-04-02T12:48:14.723090Z","published":"2025-10-15T07:59:14.606Z","related":["SUSE-SU-2025:21040-1","SUSE-SU-2025:21052-1","SUSE-SU-2025:21056-1","SUSE-SU-2025:21064-1","SUSE-SU-2025:21080-1","SUSE-SU-2025:21147-1","SUSE-SU-2025:21180-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4128-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4140-1","SUSE-SU-2025:4141-1","SUSE-SU-2025:4301-1","openSUSE-SU-2025:15671-1","openSUSE-SU-2025:20091-1","openSUSE-SU-2026:10301-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40000.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3e31a6bc07312b448fad3b45de578471f86f0e77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/895cccf639ac015f3d5f993218cf098db82ac145"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bdb3c41b358cf87d99e39d393e164f9e4a6088e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f21f530b03b4b23448edb531a0cfea434cb76bb4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40000.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40000"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1ae5ca615285d5d4f72d1de464716d85dffef19f"},{"fixed":"895cccf639ac015f3d5f993218cf098db82ac145"},{"fixed":"f21f530b03b4b23448edb531a0cfea434cb76bb4"},{"fixed":"bdb3c41b358cf87d99e39d393e164f9e4a6088e6"},{"fixed":"3e31a6bc07312b448fad3b45de578471f86f0e77"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40000.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"6.12.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.16.12"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.17.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40000.json"}}],"schema_version":"1.7.5"}