{"id":"DEBIAN-CVE-2026-68363","details":"In the Linux kernel, the following vulnerability has been resolved:  wifi: ath9k: hif_usb: don't dereference hif_dev after re-arming firmware request  ath9k_hif_request_firmware() re-arms an asynchronous firmware load via request_firmware_nowait(), passing hif_dev as the completion context, and then still dereferences hif_dev:  \tdev_info(&hif_dev-\u003eudev-\u003edev, \"ath9k_htc: Firmware %s requested\\n\", \t\t hif_dev-\u003efw_name);  The re-armed callback ath9k_hif_usb_firmware_cb() runs on the \"events\" workqueue and, when the firmware is missing, walks the retry chain into ath9k_hif_usb_firmware_fail() -\u003e complete_all(&hif_dev-\u003efw_done). That releases the wait_for_completion(&hif_dev-\u003efw_done) in a concurrent ath9k_hif_usb_disconnect(), which then kfree()s hif_dev. The trailing dev_info() in the frame that re-armed the request can therefore read freed memory (hif_dev-\u003eudev, the first field of struct hif_device_usb):    BUG: KASAN: slab-use-after-free in ath9k_hif_request_firmware   Read of size 8 ... by task kworker/...    ath9k_hif_request_firmware    ath9k_hif_usb_firmware_cb           drivers/net/wireless/ath/ath9k/hif_usb.c:1247    request_firmware_work_func   Allocated by ...:    ath9k_hif_usb_probe                 drivers/net/wireless/ath/ath9k/hif_usb.c   Freed by ...:    ath9k_hif_usb_disconnect -\u003e kfree   drivers/net/wireless/ath/ath9k/hif_usb.c  The fw_done barrier only makes disconnect wait for the firmware chain to *terminate*; it does not protect the outer ath9k_hif_request_firmware() frame that re-armed the request and keeps touching hif_dev afterwards.  Drop the post-request dev_info(): it is the only use of hif_dev after the async request is armed, and it is purely informational (the dev_err() on the failure path runs only when request_firmware_nowait() did not arm a callback, so hif_dev is still alive there).  This was first reported by syzbot as a single, non-reproduced crash that was later auto-obsoleted, and was independently rediscovered by the reFuzz fuzzer, which produced a C reproducer (USB-gadget connect/disconnect of an ath9k_htc device whose firmware download fails). The vulnerable code is unchanged and still present in v7.1-rc6, where the slab-use-after-free reproduces under KASAN once the (sub-microsecond) race window is widened.","modified":"2026-09-08T17:00:36.636137945Z","published":"2026-08-10T13:20:28.870Z","upstream":["CVE-2026-68363"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68363"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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