cve/published/2025/CVE-2025-21695.json

{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: dell-uart-backlight: fix serdev race\n\nThe dell_uart_bl_serdev_probe() function calls devm_serdev_device_open()\nbefore setting the client ops via serdev_device_set_client_ops(). This\nordering can trigger a NULL pointer dereference in the serdev controller's\nreceive_buf handler, as it assumes serdev->ops is valid when\nSERPORT_ACTIVE is set.\n\nThis is similar to the issue fixed in commit 5e700b384ec1\n(\"platform/chrome: cros_ec_uart: properly fix race condition\") where\ndevm_serdev_device_open() was called before fully initializing the\ndevice.\n\nFix the race by ensuring client ops are set before enabling the port via\ndevm_serdev_device_open().\n\nNote, serdev_device_set_baudrate() and serdev_device_set_flow_control()\ncalls should be after the devm_serdev_device_open() call."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/platform/x86/dell/dell-uart-backlight.c"
               ],
               "versions": [
                  {
                     "version": "484bae9e4d6acb5eec39e1ea47f9aa43f11b154d",
                     "lessThan": "d3a24d923333f75aaece9acb051d676edc0afb75",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "484bae9e4d6acb5eec39e1ea47f9aa43f11b154d",
                     "lessThan": "1b2128aa2d45ab20b22548dcf4b48906298ca7fd",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/platform/x86/dell/dell-uart-backlight.c"
               ],
               "versions": [
                  {
                     "version": "6.10",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.10",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.12.11",
                     "lessThanOrEqual": "6.12.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.13",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "cpeApplicability": [
            {
               "nodes": [
                  {
                     "operator": "OR",
                     "negate": false,
                     "cpeMatch": [
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "6.10",
                           "versionEndExcluding": "6.12.11"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "6.10",
                           "versionEndExcluding": "6.13"
                        }
                     ]
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/d3a24d923333f75aaece9acb051d676edc0afb75"
            },
            {
               "url": "https://git.kernel.org/stable/c/1b2128aa2d45ab20b22548dcf4b48906298ca7fd"
            }
         ],
         "title": "platform/x86: dell-uart-backlight: fix serdev race",
         "x_generator": {
            "engine": "bippy-1.2.0"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2025-21695",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}