GHSA-C745-G7J9-CPW5
Vulnerability from github – Published: 2026-06-08 18:31 – Updated: 2026-07-08 15:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-46283"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-08T17:16:46Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-c745-g7j9-cpw5",
"modified": "2026-07-08T15:31:35Z",
"published": "2026-06-08T18:31:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46283"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/53e6d2d834df40960b655b353e7a8ff4d927e1c7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84ced03172da544c9f8c0862faad48104f519352"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c424d2664f08c77f08b4580b5f0cbaabf7c229b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dd3ac52ea7a001406c7dbc663aae4b9f89da679a"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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