CVE-2026-68363 (GCVE-0-2026-68363)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34
VLAI
Title
wifi: ath9k: hif_usb: don't dereference hif_dev after re-arming firmware request
Summary
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: dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n", hif_dev->fw_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() -> complete_all(&hif_dev->fw_done). That releases the wait_for_completion(&hif_dev->fw_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->udev, 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 -> 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 47ed81aaa7f94d9808f4719e78a760c2ec1e6c86 (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 48de0c6952192b0771fca468df4364d11ec74ad9 (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 063497cc9f320ab71a7a937c3bc0a23e630aefe2 (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 7f184ca38a90889f3f6665ff96748b95da39dbee (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 10b0ce629123a3737b4eda50188f73bb7be7b68b (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 48a69cedde7388294e4ea6fd804156cd62bc04fc (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < 7c9046d92c4b9789c9d9d775e4fd5f34be64cb0a (git)
Affected: e904cf6fe23022cde4e0ea9d41601411a315a3dc , < dad9f96945d77ecd4708f730c06ef54dcd8cc057 (git)
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Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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            "drivers/net/wireless/ath/ath9k/hif_usb.c"
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              "status": "unaffected",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k: hif_usb: don\u0027t dereference hif_dev after re-arming firmware request\n\nath9k_hif_request_firmware() re-arms an asynchronous firmware load via\nrequest_firmware_nowait(), passing hif_dev as the completion context, and\nthen still dereferences hif_dev:\n\n\tdev_info(\u0026hif_dev-\u003eudev-\u003edev, \"ath9k_htc: Firmware %s requested\\n\",\n\t\t hif_dev-\u003efw_name);\n\nThe re-armed callback ath9k_hif_usb_firmware_cb() runs on the \"events\"\nworkqueue and, when the firmware is missing, walks the retry chain into\nath9k_hif_usb_firmware_fail() -\u003e complete_all(\u0026hif_dev-\u003efw_done). That\nreleases the wait_for_completion(\u0026hif_dev-\u003efw_done) in a concurrent\nath9k_hif_usb_disconnect(), which then kfree()s hif_dev. The trailing\ndev_info() in the frame that re-armed the request can therefore read freed\nmemory (hif_dev-\u003eudev, the first field of struct hif_device_usb):\n\n  BUG: KASAN: slab-use-after-free in ath9k_hif_request_firmware\n  Read of size 8 ... by task kworker/...\n   ath9k_hif_request_firmware\n   ath9k_hif_usb_firmware_cb           drivers/net/wireless/ath/ath9k/hif_usb.c:1247\n   request_firmware_work_func\n  Allocated by ...:\n   ath9k_hif_usb_probe                 drivers/net/wireless/ath/ath9k/hif_usb.c\n  Freed by ...:\n   ath9k_hif_usb_disconnect -\u003e kfree   drivers/net/wireless/ath/ath9k/hif_usb.c\n\nThe fw_done barrier only makes disconnect wait for the firmware chain to\n*terminate*; it does not protect the outer ath9k_hif_request_firmware()\nframe that re-armed the request and keeps touching hif_dev afterwards.\n\nDrop the post-request dev_info(): it is the only use of hif_dev after the\nasync request is armed, and it is purely informational (the dev_err() on the\nfailure path runs only when request_firmware_nowait() did not arm a callback,\nso hif_dev is still alive there).\n\nThis was first reported by syzbot as a single, non-reproduced crash that was\nlater auto-obsoleted, and was independently rediscovered by the reFuzz fuzzer,\nwhich produced a C reproducer (USB-gadget connect/disconnect of an ath9k_htc\ndevice whose firmware download fails). The vulnerable code is unchanged and\nstill present in v7.1-rc6, where the slab-use-after-free reproduces under KASAN\nonce the (sub-microsecond) race window is widened."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:34:18.694Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/47ed81aaa7f94d9808f4719e78a760c2ec1e6c86"
        },
        {
          "url": "https://git.kernel.org/stable/c/48de0c6952192b0771fca468df4364d11ec74ad9"
        },
        {
          "url": "https://git.kernel.org/stable/c/063497cc9f320ab71a7a937c3bc0a23e630aefe2"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f184ca38a90889f3f6665ff96748b95da39dbee"
        },
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          "url": "https://git.kernel.org/stable/c/10b0ce629123a3737b4eda50188f73bb7be7b68b"
        },
        {
          "url": "https://git.kernel.org/stable/c/48a69cedde7388294e4ea6fd804156cd62bc04fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c9046d92c4b9789c9d9d775e4fd5f34be64cb0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/dad9f96945d77ecd4708f730c06ef54dcd8cc057"
        }
      ],
      "title": "wifi: ath9k: hif_usb: don\u0027t dereference hif_dev after re-arming firmware request",
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      }
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68363",
    "datePublished": "2026-08-10T12:03:40.355Z",
    "dateReserved": "2026-07-30T09:28:09.385Z",
    "dateUpdated": "2026-08-19T16:34:18.694Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68363",
      "date": "2026-08-20",
      "epss": "0.00184",
      "percentile": "0.08348"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68363\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:28.870\",\"lastModified\":\"2026-08-19T17:20:45.943\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: ath9k: hif_usb: don\u0027t dereference hif_dev after re-arming firmware request\\n\\nath9k_hif_request_firmware() re-arms an asynchronous firmware load via\\nrequest_firmware_nowait(), passing hif_dev as the completion context, and\\nthen still dereferences hif_dev:\\n\\n\\tdev_info(\u0026hif_dev-\u003eudev-\u003edev, \\\"ath9k_htc: Firmware %s requested\\\\n\\\",\\n\\t\\t hif_dev-\u003efw_name);\\n\\nThe re-armed callback ath9k_hif_usb_firmware_cb() runs on the \\\"events\\\"\\nworkqueue and, when the firmware is missing, walks the retry chain into\\nath9k_hif_usb_firmware_fail() -\u003e complete_all(\u0026hif_dev-\u003efw_done). That\\nreleases the wait_for_completion(\u0026hif_dev-\u003efw_done) in a concurrent\\nath9k_hif_usb_disconnect(), which then kfree()s hif_dev. The trailing\\ndev_info() in the frame that re-armed the request can therefore read freed\\nmemory (hif_dev-\u003eudev, the first field of struct hif_device_usb):\\n\\n  BUG: KASAN: slab-use-after-free in ath9k_hif_request_firmware\\n  Read of size 8 ... by task kworker/...\\n   ath9k_hif_request_firmware\\n   ath9k_hif_usb_firmware_cb           drivers/net/wireless/ath/ath9k/hif_usb.c:1247\\n   request_firmware_work_func\\n  Allocated by ...:\\n   ath9k_hif_usb_probe                 drivers/net/wireless/ath/ath9k/hif_usb.c\\n  Freed by ...:\\n   ath9k_hif_usb_disconnect -\u003e kfree   drivers/net/wireless/ath/ath9k/hif_usb.c\\n\\nThe fw_done barrier only makes disconnect wait for the firmware chain to\\n*terminate*; it does not protect the outer ath9k_hif_request_firmware()\\nframe that re-armed the request and keeps touching hif_dev afterwards.\\n\\nDrop the post-request dev_info(): it is the only use of hif_dev after the\\nasync request is armed, and it is purely informational (the dev_err() on the\\nfailure path runs only when request_firmware_nowait() did not arm a callback,\\nso hif_dev is still alive there).\\n\\nThis was first reported by syzbot as a single, non-reproduced crash that was\\nlater auto-obsoleted, and was independently rediscovered by the reFuzz fuzzer,\\nwhich produced a C reproducer (USB-gadget connect/disconnect of an ath9k_htc\\ndevice whose firmware download fails). The vulnerable code is unchanged and\\nstill present in v7.1-rc6, where the slab-use-after-free reproduces under KASAN\\nonce the (sub-microsecond) race window is widened.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/ath/ath9k/hif_usb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"47ed81aaa7f94d9808f4719e78a760c2ec1e6c86\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"48de0c6952192b0771fca468df4364d11ec74ad9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"063497cc9f320ab71a7a937c3bc0a23e630aefe2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"7f184ca38a90889f3f6665ff96748b95da39dbee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"10b0ce629123a3737b4eda50188f73bb7be7b68b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"48a69cedde7388294e4ea6fd804156cd62bc04fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"7c9046d92c4b9789c9d9d775e4fd5f34be64cb0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e904cf6fe23022cde4e0ea9d41601411a315a3dc\",\"lessThan\":\"dad9f96945d77ecd4708f730c06ef54dcd8cc057\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/ath/ath9k/hif_usb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/063497cc9f320ab71a7a937c3bc0a23e630aefe2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/10b0ce629123a3737b4eda50188f73bb7be7b68b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47ed81aaa7f94d9808f4719e78a760c2ec1e6c86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48a69cedde7388294e4ea6fd804156cd62bc04fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48de0c6952192b0771fca468df4364d11ec74ad9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c9046d92c4b9789c9d9d775e4fd5f34be64cb0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f184ca38a90889f3f6665ff96748b95da39dbee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dad9f96945d77ecd4708f730c06ef54dcd8cc057\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T14:19:34+00:00",
      "cve": "CVE-2026-68363",
      "id": "CVE-2026-68363",
      "initial_release_date": "2026-08-10T12:03:40.355000+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: ath9k Wi-Fi driver use-after-free vulnerability leading to system crash",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68363.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T17:13:54Z",
      "cve": "CVE-2026-68363",
      "id": "CVE-2026-68363",
      "initial_release_date": "2026-08-14T17:13:54Z",
      "product_status:known_affected": "193",
      "product_status:known_not_affected": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68363",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68363.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.