GHSA-H6WR-63V9-2M6H
Vulnerability from github – Published: 2024-04-10 21:30 – Updated: 2025-01-14 15:30In the Linux kernel, the following vulnerability has been resolved:
selinux: fix NULL-pointer dereference when hashtab allocation fails
When the hash table slot array allocation fails in hashtab_init(), h->size is left initialized with a non-zero value, but the h->htable pointer is NULL. This may then cause a NULL pointer dereference, since the policydb code relies on the assumption that even after a failed hashtab_init(), hashtab_map() and hashtab_destroy() can be safely called on it. Yet, these detect an empty hashtab only by looking at the size.
Fix this by making sure that hashtab_init() always leaves behind a valid empty hashtab when the allocation fails.
{
"affected": [],
"aliases": [
"CVE-2021-47218"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-10T19:15:48Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: fix NULL-pointer dereference when hashtab allocation fails\n\nWhen the hash table slot array allocation fails in hashtab_init(),\nh-\u003esize is left initialized with a non-zero value, but the h-\u003ehtable\npointer is NULL. This may then cause a NULL pointer dereference, since\nthe policydb code relies on the assumption that even after a failed\nhashtab_init(), hashtab_map() and hashtab_destroy() can be safely called\non it. Yet, these detect an empty hashtab only by looking at the size.\n\nFix this by making sure that hashtab_init() always leaves behind a valid\nempty hashtab when the allocation fails.",
"id": "GHSA-h6wr-63v9-2m6h",
"modified": "2025-01-14T15:30:48Z",
"published": "2024-04-10T21:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47218"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b"
}
],
"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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