CVE-2025-38632 (GCVE-0-2025-38632)
Vulnerability from cvelistv5
Published
2025-08-22 16:00
Modified
2025-08-22 16:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: pinmux: fix race causing mux_owner NULL with active mux_usecount commit 5a3e85c3c397 ("pinmux: Use sequential access to access desc->pinmux data") tried to address the issue when two client of the same gpio calls pinctrl_select_state() for the same functionality, was resulting in NULL pointer issue while accessing desc->mux_owner. However, issue was not completely fixed due to the way it was handled and it can still result in the same NULL pointer. The issue occurs due to the following interleaving: cpu0 (process A) cpu1 (process B) pin_request() { pin_free() { mutex_lock() desc->mux_usecount--; //becomes 0 .. mutex_unlock() mutex_lock(desc->mux) desc->mux_usecount++; // becomes 1 desc->mux_owner = owner; mutex_unlock(desc->mux) mutex_lock(desc->mux) desc->mux_owner = NULL; mutex_unlock(desc->mux) This sequence leads to a state where the pin appears to be in use (`mux_usecount == 1`) but has no owner (`mux_owner == NULL`), which can cause NULL pointer on next pin_request on the same pin. Ensure that updates to mux_usecount and mux_owner are performed atomically under the same lock. Only clear mux_owner when mux_usecount reaches zero and no new owner has been assigned.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b075c011032f88d1cfde3b45d6dcf08b44140eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22b585cbd67d14df3b91529d1b990661c300faa9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b2a3e7189028aa7c4d53a84364f2ea9fb209787
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ea3f6b9a67be3476e331ce51cac316c2614a564
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7bd6e3971eb7f0e34d2fdce1b18b08094e0c804
Impacted products
Vendor Product Version
Linux Linux Version: 2da32aed4a97ca1d70fb8b77926f72f30ce5fb4b
Version: c11e2ec9a780f54982a187ee10ffd1b810715c85
Version: 5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e
Version: 5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e
Version: 5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e
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   Linux Linux Version: 6.13
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pinctrl/pinmux.c"
          ],
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          "product": "Linux",
          "programFiles": [
            "drivers/pinctrl/pinmux.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.102",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.102",
                  "versionStartIncluding": "6.6.66",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.42",
                  "versionStartIncluding": "6.12.5",
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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\npinmux: fix race causing mux_owner NULL with active mux_usecount\n\ncommit 5a3e85c3c397 (\"pinmux: Use sequential access to access\ndesc-\u003epinmux data\") tried to address the issue when two client of the\nsame gpio calls pinctrl_select_state() for the same functionality, was\nresulting in NULL pointer issue while accessing desc-\u003emux_owner.\nHowever, issue was not completely fixed due to the way it was handled\nand it can still result in the same NULL pointer.\n\nThe issue occurs due to the following interleaving:\n\n     cpu0 (process A)                   cpu1 (process B)\n\n      pin_request() {                   pin_free() {\n\n                                         mutex_lock()\n                                         desc-\u003emux_usecount--; //becomes 0\n                                         ..\n                                         mutex_unlock()\n\n  mutex_lock(desc-\u003emux)\n  desc-\u003emux_usecount++; // becomes 1\n  desc-\u003emux_owner = owner;\n  mutex_unlock(desc-\u003emux)\n\n                                         mutex_lock(desc-\u003emux)\n                                         desc-\u003emux_owner = NULL;\n                                         mutex_unlock(desc-\u003emux)\n\nThis sequence leads to a state where the pin appears to be in use\n(`mux_usecount == 1`) but has no owner (`mux_owner == NULL`), which can\ncause NULL pointer on next pin_request on the same pin.\n\nEnsure that updates to mux_usecount and mux_owner are performed\natomically under the same lock. Only clear mux_owner when mux_usecount\nreaches zero and no new owner has been assigned."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-22T16:00:40.423Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9b2a3e7189028aa7c4d53a84364f2ea9fb209787"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ea3f6b9a67be3476e331ce51cac316c2614a564"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7bd6e3971eb7f0e34d2fdce1b18b08094e0c804"
        },
        {
          "url": "https://git.kernel.org/stable/c/22b585cbd67d14df3b91529d1b990661c300faa9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b075c011032f88d1cfde3b45d6dcf08b44140eb"
        }
      ],
      "title": "pinmux: fix race causing mux_owner NULL with active mux_usecount",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38632",
    "datePublished": "2025-08-22T16:00:40.423Z",
    "dateReserved": "2025-04-16T04:51:24.029Z",
    "dateUpdated": "2025-08-22T16:00:40.423Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38632\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:37.033\",\"lastModified\":\"2025-08-22T18:08:51.663\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npinmux: fix race causing mux_owner NULL with active mux_usecount\\n\\ncommit 5a3e85c3c397 (\\\"pinmux: Use sequential access to access\\ndesc-\u003epinmux data\\\") tried to address the issue when two client of the\\nsame gpio calls pinctrl_select_state() for the same functionality, was\\nresulting in NULL pointer issue while accessing desc-\u003emux_owner.\\nHowever, issue was not completely fixed due to the way it was handled\\nand it can still result in the same NULL pointer.\\n\\nThe issue occurs due to the following interleaving:\\n\\n     cpu0 (process A)                   cpu1 (process B)\\n\\n      pin_request() {                   pin_free() {\\n\\n                                         mutex_lock()\\n                                         desc-\u003emux_usecount--; //becomes 0\\n                                         ..\\n                                         mutex_unlock()\\n\\n  mutex_lock(desc-\u003emux)\\n  desc-\u003emux_usecount++; // becomes 1\\n  desc-\u003emux_owner = owner;\\n  mutex_unlock(desc-\u003emux)\\n\\n                                         mutex_lock(desc-\u003emux)\\n                                         desc-\u003emux_owner = NULL;\\n                                         mutex_unlock(desc-\u003emux)\\n\\nThis sequence leads to a state where the pin appears to be in use\\n(`mux_usecount == 1`) but has no owner (`mux_owner == NULL`), which can\\ncause NULL pointer on next pin_request on the same pin.\\n\\nEnsure that updates to mux_usecount and mux_owner are performed\\natomically under the same lock. Only clear mux_owner when mux_usecount\\nreaches zero and no new owner has been assigned.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b075c011032f88d1cfde3b45d6dcf08b44140eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/22b585cbd67d14df3b91529d1b990661c300faa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b2a3e7189028aa7c4d53a84364f2ea9fb209787\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ea3f6b9a67be3476e331ce51cac316c2614a564\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7bd6e3971eb7f0e34d2fdce1b18b08094e0c804\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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