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
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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Show details on NVD website
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            ],
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      "current_release_date": "2026-09-12T17:16:17Z",
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      "product_status:recommended": "462",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47218.json",
      "version": "55"
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                      },
                      {
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                      {
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        "datePublished": "2024-04-10T19:01:57.060Z",
        "dateReserved": "2024-04-10T18:59:19.528Z",
        "dateUpdated": "2024-11-04T12:01:42.926Z",
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      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.