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CVE-2021-47302

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: igc: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring.

Published May 21, 2024CWE-416EPSS 0.23%

Overview

CVE-2021-47302 is a high-severity vulnerability. It was published on May 21, 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:

igc: Fix use-after-free error during reset

Cleans the next descriptor to watch (next_to_watch) when cleaning the

TX ring.

Failure to do so can cause invalid memory accesses. If igc_poll() runs

while the controller is being reset this can lead to the driver try to

free a skb that was already freed.

Log message:

[ 101.525242] refcount_t: underflow; use-after-free.

[ 101.525251] WARNING: CPU: 1 PID: 646 at lib/refcount.c:28 refcount_warn_saturate+0xab/0xf0

[ 101.525259] Modules linked in: sch_etf(E) sch_mqprio(E) rfkill(E) intel_rapl_msr(E) intel_rapl_common(E)

x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) binfmt_misc(E) kvm_intel(E) kvm(E) irqbypass(E) crc32_pclmul(E)

ghash_clmulni_intel(E) aesni_intel(E) mei_wdt(E) libaes(E) crypto_simd(E) cryptd(E) glue_helper(E) snd_hda_codec_hdmi(E)

rapl(E) intel_cstate(E) snd_hda_intel(E) snd_intel_dspcfg(E) sg(E) soundwire_intel(E) intel_uncore(E) at24(E)

s

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/56ea7ed103b46970e171eb1c95916f393d64eeffRefgit.kernel.org/stable/c/a9508e0edfe369ac95d0825bcdca976436ce780fRefgit.kernel.org/stable/c/e15f629036bac005fc758b4ad17896cf2312add4Refgit.kernel.org/stable/c/ea5e36b7367ea0a36ef73a163768f16d2977bd83Refgit.kernel.org/stable/c/56ea7ed103b46970e171eb1c95916f393d64eeffRefgit.kernel.org/stable/c/a9508e0edfe369ac95d0825bcdca976436ce780fRefgit.kernel.org/stable/c/e15f629036bac005fc758b4ad17896cf2312add4Refgit.kernel.org/stable/c/ea5e36b7367ea0a36ef73a163768f16d2977bd83

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47302?

CVE-2021-47302 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47302?

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-2021-47302?

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-2021-47302?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47302 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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