CVE-2021-47218 (GCVE-0-2021-47218)

Vulnerability from cvelistv5 – Published: 2024-04-10 19:01 – Updated: 2026-05-11 13:50
VLAI
Title
selinux: fix NULL-pointer dereference when hashtab allocation fails
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-15 15:01 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 03414a49ad5f3c56988c36d2070e402ffa17feaf , < b17dd53cac769dd13031b0ca34f90cc65e523fab (git)
Affected: 03414a49ad5f3c56988c36d2070e402ffa17feaf , < 83c8ab8503adf56bf68dafc7a382f4946c87da79 (git)
Affected: 03414a49ad5f3c56988c36d2070e402ffa17feaf , < dc27f3c5d10c58069672215787a96b4fae01818b (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.82 , ≤ 5.10.* (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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              "url": "https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79"
            },
            {
              "url": "https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b"
            }
          ],
          "title": "selinux: fix NULL-pointer dereference when hashtab allocation fails",
          "x_generator": {
            "engine": "bippy-9e1c9544281a"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47218",
        "datePublished": "2024-04-10T19:01:57.060Z",
        "dateReserved": "2024-04-10T18:59:19.528Z",
        "dateUpdated": "2024-11-04T12:01:42.926Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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