fkie_cve-2021-47218
Vulnerability from fkie_nvd
Published
2024-04-10 19:15
Modified
2025-01-14 14:44
Severity ?
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.16 | |
| linux | linux_kernel | 5.16 |
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"value": "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."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: selinux: corregir la desreferencia de puntero NULL cuando falla la asignaci\u00f3n de hashtab Cuando la asignaci\u00f3n de la matriz de ranuras de la tabla hash falla en hashtab_init(), h-\u0026gt;size se deja inicializado con un valor distinto de cero, pero el puntero h-\u0026gt;htable es NULL. Esto puede causar una desreferencia de puntero NULL, ya que el c\u00f3digo policydb se basa en la suposici\u00f3n de que incluso despu\u00e9s de un hashtab_init() fallido, se pueden llamar hashtab_map() y hashtab_destroy() de forma segura. Sin embargo, estos detectan un hashtab vac\u00edo solo mirando el tama\u00f1o. Solucione esto asegur\u00e1ndose de que hashtab_init() siempre deje atr\u00e1s un hashtab vac\u00edo v\u00e1lido cuando falla la asignaci\u00f3n."
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"id": "CVE-2021-47218",
"lastModified": "2025-01-14T14:44:55.610",
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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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