GHSA-Q37X-R635-XF49
Vulnerability from github – Published: 2025-03-06 18:31 – Updated: 2025-03-24 18:30In the Linux kernel, the following vulnerability has been resolved:
firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool()
Commit 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq completion variable initialization") introduced a write barrier in probe function to store global '__scm' variable. We all known barriers are paired (see memory-barriers.txt: "Note that write barriers should normally be paired with read or address-dependency barriers"), therefore accessing it from concurrent contexts requires read barrier. Previous commit added such barrier in qcom_scm_is_available(), so let's use that directly.
Lack of this read barrier can result in fetching stale '__scm' variable value, NULL, and dereferencing it.
Note that barrier in qcom_scm_is_available() satisfies here the control dependency.
{
"affected": [],
"aliases": [
"CVE-2024-58084"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-03-06T17:15:21Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool()\n\nCommit 2e4955167ec5 (\"firmware: qcom: scm: Fix __scm and waitq\ncompletion variable initialization\") introduced a write barrier in probe\nfunction to store global \u0027__scm\u0027 variable. We all known barriers are\npaired (see memory-barriers.txt: \"Note that write barriers should\nnormally be paired with read or address-dependency barriers\"), therefore\naccessing it from concurrent contexts requires read barrier. Previous\ncommit added such barrier in qcom_scm_is_available(), so let\u0027s use that\ndirectly.\n\nLack of this read barrier can result in fetching stale \u0027__scm\u0027 variable\nvalue, NULL, and dereferencing it.\n\nNote that barrier in qcom_scm_is_available() satisfies here the control\ndependency.",
"id": "GHSA-q37x-r635-xf49",
"modified": "2025-03-24T18:30:58Z",
"published": "2025-03-06T18:31:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-58084"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b628510397b5cafa1f5d3e848a28affd1c635302"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e03db7c1255ebabba5e1a447754faeb138de15a2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fee921e3c641f64185abee83f9a6e65f0b380682"
}
],
"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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