fkie_cve-2022-50709
Vulnerability from fkie_nvd
Published
2025-12-24 11:15
Modified
2025-12-29 15:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: avoid uninit memory read in ath9k_htc_rx_msg() syzbot is reporting uninit value at ath9k_htc_rx_msg() [1], for ioctl(USB_RAW_IOCTL_EP_WRITE) can call ath9k_hif_usb_rx_stream() with pkt_len = 0 but ath9k_hif_usb_rx_stream() uses __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC) based on an assumption that pkt_len is valid. As a result, ath9k_hif_usb_rx_stream() allocates skb with uninitialized memory and ath9k_htc_rx_msg() is reading from uninitialized memory. Since bytes accessed by ath9k_htc_rx_msg() is not known until ath9k_htc_rx_msg() is called, it would be difficult to check minimal valid pkt_len at "if (pkt_len > 2 * MAX_RX_BUF_SIZE) {" line in ath9k_hif_usb_rx_stream(). We have two choices. One is to workaround by adding __GFP_ZERO so that ath9k_htc_rx_msg() sees 0 if pkt_len is invalid. The other is to let ath9k_htc_rx_msg() validate pkt_len before accessing. This patch chose the latter. Note that I'm not sure threshold condition is correct, for I can't find details on possible packet length used by this protocol.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d2649b288b7b9484e3d4380c0d6c4720a17e473
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c485f4f2a64258acc5228e78ffb828c68d9e770
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4891a50f5ed8bfcb8f2a4b816b0676f398687783
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84242f15f911f34aec9b22f99d1e9bff19723dbe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9661724f6206bd606ecf13acada676a9975d230b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b1b4144508adfc585e43856b31baaf9008a3beb4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b383e8abed41cc6ff1a3b34de75df9397fa4878c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3d2a3b7e290d0bdbddfcee5a6c3d922e2b7e02a
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k: avoid uninit memory read in ath9k_htc_rx_msg()\n\nsyzbot is reporting uninit value at ath9k_htc_rx_msg() [1], for\nioctl(USB_RAW_IOCTL_EP_WRITE) can call ath9k_hif_usb_rx_stream() with\npkt_len = 0 but ath9k_hif_usb_rx_stream() uses\n__dev_alloc_skb(pkt_len + 32, GFP_ATOMIC) based on an assumption that\npkt_len is valid. As a result, ath9k_hif_usb_rx_stream() allocates skb\nwith uninitialized memory and ath9k_htc_rx_msg() is reading from\nuninitialized memory.\n\nSince bytes accessed by ath9k_htc_rx_msg() is not known until\nath9k_htc_rx_msg() is called, it would be difficult to check minimal valid\npkt_len at \"if (pkt_len \u003e 2 * MAX_RX_BUF_SIZE) {\" line in\nath9k_hif_usb_rx_stream().\n\nWe have two choices. One is to workaround by adding __GFP_ZERO so that\nath9k_htc_rx_msg() sees 0 if pkt_len is invalid. The other is to let\nath9k_htc_rx_msg() validate pkt_len before accessing. This patch chose\nthe latter.\n\nNote that I\u0027m not sure threshold condition is correct, for I can\u0027t find\ndetails on possible packet length used by this protocol."
    }
  ],
  "id": "CVE-2022-50709",
  "lastModified": "2025-12-29T15:58:56.260",
  "metrics": {},
  "published": "2025-12-24T11:15:51.080",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0d2649b288b7b9484e3d4380c0d6c4720a17e473"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c485f4f2a64258acc5228e78ffb828c68d9e770"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4891a50f5ed8bfcb8f2a4b816b0676f398687783"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/84242f15f911f34aec9b22f99d1e9bff19723dbe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9661724f6206bd606ecf13acada676a9975d230b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1b4144508adfc585e43856b31baaf9008a3beb4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b383e8abed41cc6ff1a3b34de75df9397fa4878c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f3d2a3b7e290d0bdbddfcee5a6c3d922e2b7e02a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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