Vulnerability Details CVE-2021-47081
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.6%
CVSS Severity
CVSS v3 Score 7.8
References
Products affected by CVE-2021-47081
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cpe:2.3:o:linux:linux_kernel:5.12
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cpe:2.3:o:linux:linux_kernel:5.12.1
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cpe:2.3:o:linux:linux_kernel:5.12.2
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cpe:2.3:o:linux:linux_kernel:5.12.3
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cpe:2.3:o:linux:linux_kernel:5.12.4
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cpe:2.3:o:linux:linux_kernel:5.12.5
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cpe:2.3:o:linux:linux_kernel:5.12.6
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cpe:2.3:o:linux:linux_kernel:5.13