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CVE-2021-47081

7.8 · HIGH

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.

Published Mar 1, 2024CWE-416EPSS 0.23%

Overview

CVE-2021-47081 is a high-severity vulnerability. It was published on March 1, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076Refgit.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7Refgit.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076Refgit.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47081?

CVE-2021-47081 is a high-severity vulnerability. It was published on March 1, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47081?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47081?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47081?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47081 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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