FKIE_CVE-2026-46283

Vulnerability from fkie_nvd - Published: 2026-06-08 17:16 - Updated: 2026-07-23 08:10
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tpm: Use kfree_sensitive() to free auth session in tpm_dev_release() tpm_dev_release() uses plain kfree() to free chip->auth, which contains sensitive cryptographic material including HMAC session keys, nonces, and passphrase data (struct tpm2_auth). Every other code path that frees this structure uses kfree_sensitive() to zero the memory before releasing it: both tpm2_end_auth_session() and tpm_buf_check_hmac_response() do so. The tpm_dev_release() path is the only one that does not, leaving key material in freed slab memory until it is eventually overwritten. Use kfree_sensitive() for consistency with the rest of the driver and to ensure session keys are scrubbed during device teardown.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53e6d2d834df40960b655b353e7a8ff4d927e1c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84ced03172da544c9f8c0862faad48104f519352Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c424d2664f08c77f08b4580b5f0cbaabf7c229b2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd3ac52ea7a001406c7dbc663aae4b9f89da679aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm-chip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dd3ac52ea7a001406c7dbc663aae4b9f89da679a",
              "status": "affected",
              "version": "699e3efd6c645c741ea4d6d58282c56b6d108cf7",
              "versionType": "git"
            },
            {
              "lessThan": "53e6d2d834df40960b655b353e7a8ff4d927e1c7",
              "status": "affected",
              "version": "699e3efd6c645c741ea4d6d58282c56b6d108cf7",
              "versionType": "git"
            },
            {
              "lessThan": "84ced03172da544c9f8c0862faad48104f519352",
              "status": "affected",
              "version": "699e3efd6c645c741ea4d6d58282c56b6d108cf7",
              "versionType": "git"
            },
            {
              "lessThan": "c424d2664f08c77f08b4580b5f0cbaabf7c229b2",
              "status": "affected",
              "version": "699e3efd6c645c741ea4d6d58282c56b6d108cf7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm-chip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DE217E72-2117-418C-97F0-213685E36DC0",
              "versionEndExcluding": "6.12.86",
              "versionStartIncluding": "6.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A10AC84F-C058-47D5-85B4-E6E51A613B74",
              "versionEndExcluding": "6.18.27",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3",
              "versionEndExcluding": "7.0.4",
              "versionStartIncluding": "6.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: Use kfree_sensitive() to free auth session in tpm_dev_release()\n\ntpm_dev_release() uses plain kfree() to free chip-\u003eauth, which contains\nsensitive cryptographic material including HMAC session keys, nonces,\nand passphrase data (struct tpm2_auth).\n\nEvery other code path that frees this structure uses kfree_sensitive()\nto zero the memory before releasing it: both tpm2_end_auth_session()\nand tpm_buf_check_hmac_response() do so. The tpm_dev_release() path\nis the only one that does not, leaving key material in freed slab\nmemory until it is eventually overwritten.\n\nUse kfree_sensitive() for consistency with the rest of the driver and\nto ensure session keys are scrubbed during device teardown."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntpm: Usar kfree_sensitive() para liberar la sesi\u00f3n de autenticaci\u00f3n en tpm_dev_release()\n\ntpm_dev_release() usa kfree() sin m\u00e1s para liberar chip-\u003eauth, que contiene material criptogr\u00e1fico sensible, incluyendo claves de sesi\u00f3n HMAC, nonces y datos de frase de contrase\u00f1a (estructura tpm2_auth).\n\nTodas las dem\u00e1s rutas de c\u00f3digo que liberan esta estructura usan kfree_sensitive() para poner a cero la memoria antes de liberarla: tanto tpm2_end_auth_session() como tpm_buf_check_hmac_response() lo hacen. La ruta de tpm_dev_release() es la \u00fanica que no lo hace, dejando material de clave en la memoria slab liberada hasta que finalmente sea sobrescrito.\n\nUsar kfree_sensitive() para consistencia con el resto del controlador y para asegurar que las claves de sesi\u00f3n sean borradas durante el desmontaje del dispositivo."
    }
  ],
  "id": "CVE-2026-46283",
  "lastModified": "2026-07-23T08:10:00.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-06-08T17:16:46.063",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/53e6d2d834df40960b655b353e7a8ff4d927e1c7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/84ced03172da544c9f8c0862faad48104f519352"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c424d2664f08c77f08b4580b5f0cbaabf7c229b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/dd3ac52ea7a001406c7dbc663aae4b9f89da679a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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