{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1085b8276bb4239daa7008f0dcd5c973e4bd690f"
            },
            {
              "fixed": "111e520efbe82b324bc42b1999b723c0619eea6d"
            },
            {
              "fixed": "934d1cd40e2893bf7a041b54f6afd1c008d7a21c"
            },
            {
              "fixed": "493333f167926c7adab8e7563e21ad71d8af84fa"
            },
            {
              "fixed": "73851a7c43dfa52d2ed9415889b33daf85da0ed9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.10.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72151.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: tpm2-sessions: wait for async KPP completion in tpm_buf_append_salt\n\ntpm_buf_append_salt() in drivers/char/tpm/tpm2-sessions.c calls\ncrypto_kpp_generate_public_key() and crypto_kpp_compute_shared_secret()\nwithout installing a completion callback, discards both return values,\nand immediately frees the kpp_request via kpp_request_free(). When the\nresolved ecdh-nist-p256 KPP backend is asynchronous (atmel-ecc, HPRE,\nkeembay-ocs), either operation returns -EINPROGRESS and the deferred\ncompletion worker dereferences the freed request.\n\nThe path fires automatically from the hwrng_fillfn kernel thread via\ntpm_get_random -\u003e tpm2_get_random -\u003e tpm2_start_auth_session -\u003e\ntpm_buf_append_salt on every entropy poll, without any userland action.\n\nInstall crypto_req_done as the completion callback, wrap both KPP\noperations in crypto_wait_req(), and propagate errors to the caller.\nThe wait is a no-op for synchronous backends.",
  "id": "CVE-2026-72151",
  "modified": "2026-08-18T03:31:14.948877759Z",
  "published": "2026-08-15T05:53:22.196Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/111e520efbe82b324bc42b1999b723c0619eea6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/493333f167926c7adab8e7563e21ad71d8af84fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73851a7c43dfa52d2ed9415889b33daf85da0ed9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/934d1cd40e2893bf7a041b54f6afd1c008d7a21c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72151.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72151"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tpm: tpm2-sessions: wait for async KPP completion in tpm_buf_append_salt"
}