fkie_cve-2021-47081
Vulnerability from fkie_nvd
Published
2024-03-01 22:15
Modified
2024-12-09 18:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
Our code analyzer reported a uaf.
In gaudi_memset_device_memory, cb is get via hl_cb_kernel_create()
with 2 refcount.
If hl_cs_allocate_job() failed, the execution runs into release_cb
branch. One ref of cb is dropped by hl_cb_put(cb) and could be freed
if other thread also drops one ref. Then cb is used by cb->id later,
which is a potential uaf.
My patch add a variable 'id' to accept the value of cb->id before the
hl_cb_put(cb) is called, to avoid the potential uaf.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 |
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhabanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory\n\nOur code analyzer reported a uaf.\n\nIn gaudi_memset_device_memory, cb is get via hl_cb_kernel_create()\nwith 2 refcount.\nIf hl_cs_allocate_job() failed, the execution runs into release_cb\nbranch. One ref of cb is dropped by hl_cb_put(cb) and could be freed\nif other thread also drops one ref. Then cb is used by cb-\u003eid later,\nwhich is a potential uaf.\n\nMy patch add a variable \u0027id\u0027 to accept the value of cb-\u003eid before the\nhl_cb_put(cb) is called, to avoid the potential uaf."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: habanalabs/gaudi: Corregir un uso potencial despu\u00e9s de liberar en gaudi_memset_device_memory Nuestro analizador de c\u00f3digo report\u00f3 un uaf. En gaudi_memset_device_memory, cb se obtiene a trav\u00e9s de hl_cb_kernel_create() con 2 refcount. Si hl_cs_allocate_job() falla, la ejecuci\u00f3n se ejecuta en la rama release_cb. hl_cb_put(cb) elimina una referencia de cb y podr\u00eda liberarse si otro hilo tambi\u00e9n elimina una referencia. Luego, cb-\u0026gt;id usa cb m\u00e1s tarde, que es un uaf potencial. Mi parche agrega una variable \u0027id\u0027 para aceptar el valor de cb-\u0026gt;id antes de llamar a hl_cb_put(cb), para evitar el potencial uaf."
}
],
"id": "CVE-2021-47081",
"lastModified": "2024-12-09T18:45:24.617",
"metrics": {
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"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
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"published": "2024-03-01T22:15:47.483",
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"vulnStatus": "Analyzed",
"weaknesses": [
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"value": "CWE-416"
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"source": "nvd@nist.gov",
"type": "Primary"
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}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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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