CVE-2025-68194 (GCVE-0-2025-68194)
Vulnerability from cvelistv5
Published
2025-12-16 13:43
Modified
2025-12-16 13:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: imon: make send_packet() more robust syzbot is reporting that imon has three problems which result in hung tasks due to forever holding device lock [1]. First problem is that when usb_rx_callback_intf0() once got -EPROTO error after ictx->dev_present_intf0 became true, usb_rx_callback_intf0() resubmits urb after printk(), and resubmitted urb causes usb_rx_callback_intf0() to again get -EPROTO error. This results in printk() flooding (RCU stalls). Alan Stern commented [2] that In theory it's okay to resubmit _if_ the driver has a robust error-recovery scheme (such as giving up after some fixed limit on the number of errors or after some fixed time has elapsed, perhaps with a time delay to prevent a flood of errors). Most drivers don't bother to do this; they simply give up right away. This makes them more vulnerable to short-term noise interference during USB transfers, but in reality such interference is quite rare. There's nothing really wrong with giving up right away. but imon has a poor error-recovery scheme which just retries forever; this behavior should be fixed. Since I'm not sure whether it is safe for imon users to give up upon any error code, this patch takes care of only union of error codes chosen from modules in drivers/media/rc/ directory which handle -EPROTO error (i.e. ir_toy, mceusb and igorplugusb). Second problem is that when usb_rx_callback_intf0() once got -EPROTO error before ictx->dev_present_intf0 becomes true, usb_rx_callback_intf0() always resubmits urb due to commit 8791d63af0cf ("[media] imon: don't wedge hardware after early callbacks"). Move the ictx->dev_present_intf0 test introduced by commit 6f6b90c9231a ("[media] imon: don't parse scancodes until intf configured") to immediately before imon_incoming_packet(), or the first problem explained above happens without printk() flooding (i.e. hung task). Third problem is that when usb_rx_callback_intf0() is not called for some reason (e.g. flaky hardware; the reproducer for this problem sometimes prevents usb_rx_callback_intf0() from being called), wait_for_completion_interruptible() in send_packet() never returns (i.e. hung task). As a workaround for such situation, change send_packet() to wait for completion with timeout of 10 seconds.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/rc/imon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: imon: make send_packet() more robust\n\nsyzbot is reporting that imon has three problems which result in\nhung tasks due to forever holding device lock [1].\n\nFirst problem is that when usb_rx_callback_intf0() once got -EPROTO error\nafter ictx-\u003edev_present_intf0 became true, usb_rx_callback_intf0()\nresubmits urb after printk(), and resubmitted urb causes\nusb_rx_callback_intf0() to again get -EPROTO error. This results in\nprintk() flooding (RCU stalls).\n\nAlan Stern commented [2] that\n\n  In theory it\u0027s okay to resubmit _if_ the driver has a robust\n  error-recovery scheme (such as giving up after some fixed limit on the\n  number of errors or after some fixed time has elapsed, perhaps with a\n  time delay to prevent a flood of errors).  Most drivers don\u0027t bother to\n  do this; they simply give up right away.  This makes them more\n  vulnerable to short-term noise interference during USB transfers, but in\n  reality such interference is quite rare.  There\u0027s nothing really wrong\n  with giving up right away.\n\nbut imon has a poor error-recovery scheme which just retries forever;\nthis behavior should be fixed.\n\nSince I\u0027m not sure whether it is safe for imon users to give up upon any\nerror code, this patch takes care of only union of error codes chosen from\nmodules in drivers/media/rc/ directory which handle -EPROTO error (i.e.\nir_toy, mceusb and igorplugusb).\n\nSecond problem is that when usb_rx_callback_intf0() once got -EPROTO error\nbefore ictx-\u003edev_present_intf0 becomes true, usb_rx_callback_intf0() always\nresubmits urb due to commit 8791d63af0cf (\"[media] imon: don\u0027t wedge\nhardware after early callbacks\"). Move the ictx-\u003edev_present_intf0 test\nintroduced by commit 6f6b90c9231a (\"[media] imon: don\u0027t parse scancodes\nuntil intf configured\") to immediately before imon_incoming_packet(), or\nthe first problem explained above happens without printk() flooding (i.e.\nhung task).\n\nThird problem is that when usb_rx_callback_intf0() is not called for some\nreason (e.g. flaky hardware; the reproducer for this problem sometimes\nprevents usb_rx_callback_intf0() from being called),\nwait_for_completion_interruptible() in send_packet() never returns (i.e.\nhung task). As a workaround for such situation, change send_packet() to\nwait for completion with timeout of 10 seconds."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:43:20.525Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/519737af11c03590819a6eec2ad532cfdb87ea63"
        },
        {
          "url": "https://git.kernel.org/stable/c/f58ab83b7b7133e6baefe03a46846c4f6ce45e2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/26f6a1dd5d81ad61a875a747698da6f27abf389b"
        },
        {
          "url": "https://git.kernel.org/stable/c/667afd4681781f60a644cd0d2ee6c59cb1c36208"
        },
        {
          "url": "https://git.kernel.org/stable/c/8231e80118463be5598daaf266c1c83650f1948b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0213e4175abbb9dfcbf7c197e3817d527f459ad5"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7f3ecb4934fff782fa9bb1cd16e2290c041b22d"
        },
        {
          "url": "https://git.kernel.org/stable/c/eecd203ada43a4693ce6fdd3a58ae10c7819252c"
        }
      ],
      "title": "media: imon: make send_packet() more robust",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68194",
    "datePublished": "2025-12-16T13:43:20.525Z",
    "dateReserved": "2025-12-16T13:41:40.253Z",
    "dateUpdated": "2025-12-16T13:43:20.525Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68194\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:52.127\",\"lastModified\":\"2025-12-18T15:08:25.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: imon: make send_packet() more robust\\n\\nsyzbot is reporting that imon has three problems which result in\\nhung tasks due to forever holding device lock [1].\\n\\nFirst problem is that when usb_rx_callback_intf0() once got -EPROTO error\\nafter ictx-\u003edev_present_intf0 became true, usb_rx_callback_intf0()\\nresubmits urb after printk(), and resubmitted urb causes\\nusb_rx_callback_intf0() to again get -EPROTO error. This results in\\nprintk() flooding (RCU stalls).\\n\\nAlan Stern commented [2] that\\n\\n  In theory it\u0027s okay to resubmit _if_ the driver has a robust\\n  error-recovery scheme (such as giving up after some fixed limit on the\\n  number of errors or after some fixed time has elapsed, perhaps with a\\n  time delay to prevent a flood of errors).  Most drivers don\u0027t bother to\\n  do this; they simply give up right away.  This makes them more\\n  vulnerable to short-term noise interference during USB transfers, but in\\n  reality such interference is quite rare.  There\u0027s nothing really wrong\\n  with giving up right away.\\n\\nbut imon has a poor error-recovery scheme which just retries forever;\\nthis behavior should be fixed.\\n\\nSince I\u0027m not sure whether it is safe for imon users to give up upon any\\nerror code, this patch takes care of only union of error codes chosen from\\nmodules in drivers/media/rc/ directory which handle -EPROTO error (i.e.\\nir_toy, mceusb and igorplugusb).\\n\\nSecond problem is that when usb_rx_callback_intf0() once got -EPROTO error\\nbefore ictx-\u003edev_present_intf0 becomes true, usb_rx_callback_intf0() always\\nresubmits urb due to commit 8791d63af0cf (\\\"[media] imon: don\u0027t wedge\\nhardware after early callbacks\\\"). Move the ictx-\u003edev_present_intf0 test\\nintroduced by commit 6f6b90c9231a (\\\"[media] imon: don\u0027t parse scancodes\\nuntil intf configured\\\") to immediately before imon_incoming_packet(), or\\nthe first problem explained above happens without printk() flooding (i.e.\\nhung task).\\n\\nThird problem is that when usb_rx_callback_intf0() is not called for some\\nreason (e.g. flaky hardware; the reproducer for this problem sometimes\\nprevents usb_rx_callback_intf0() from being called),\\nwait_for_completion_interruptible() in send_packet() never returns (i.e.\\nhung task). As a workaround for such situation, change send_packet() to\\nwait for completion with timeout of 10 seconds.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0213e4175abbb9dfcbf7c197e3817d527f459ad5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26f6a1dd5d81ad61a875a747698da6f27abf389b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/519737af11c03590819a6eec2ad532cfdb87ea63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/667afd4681781f60a644cd0d2ee6c59cb1c36208\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8231e80118463be5598daaf266c1c83650f1948b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eecd203ada43a4693ce6fdd3a58ae10c7819252c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f58ab83b7b7133e6baefe03a46846c4f6ce45e2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7f3ecb4934fff782fa9bb1cd16e2290c041b22d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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