github - ghsa-h6wr-63v9-2m6h

ghsa-h6wr-63v9-2m6h

Vulnerability from github

Published

2024-04-10 21:30

Modified

2024-04-10 21:30

Details

In 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.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47218"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:48Z",
    "severity": null
  },
  "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": "2024-04-10T21:30:32Z",
  "published": "2024-04-10T21:30:32Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47218"
    },
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    },
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  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47218

Vulnerability from cvelistv5

Published

2024-04-10 19:01

Modified

2024-11-04 12:01

Severity ?

Summary

selinux: fix NULL-pointer dereference when hashtab allocation fails

References

▼	URL	Tags
	https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fab
	https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79
	https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b

Impacted products

Vendor

Product

Version

▼

Linux

Version: 03414a49ad5f
Version: 03414a49ad5f
Version: 03414a49ad5f

Linux

Version: 5.8

Show details on NVD website

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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