CVE-2021-47081
Vulnerability from cvelistv5
Published
2024-03-01 21:15
Modified
2024-11-04 11:59
Severity ?
Summary
habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "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."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47081\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-01T22:15:47.483\",\"lastModified\":\"2024-03-01T22:22:25.913\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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