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Exploited vulnerability · CISA KEV

Is CVE-2021-0920 exploited? Yes: in CISA KEV since 23 May 2022

Gociux · Android Kernel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-0920, Android Kernel Race Condition Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 May 2022, 159 days after it was published. It affects Android Kernel. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 23 May 2022
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity6.4CVSS 3.1 · medium
US federal due13 Jun 2022BOD 22-01 deadline

What it is

Android kernel contains a race condition, which allows for a use-after-free vulnerability. Exploitation can allow for privilege escalation.

VendorAndroid (17 exploited CVEs in KEV)
ProductKernel
VulnerabilityAndroid Kernel Race Condition Vulnerability
WeaknessCWE-362, CWE-416
Published15 Dec 2021
Added to KEV23 May 2022
Reported by (CNA)google_android

What to do

  1. Check whether you run it. Look for Kernel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Android CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 15 Dec 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Android.

Other exploited CVEs in Kernel

References

Questions

Is CVE-2021-0920 being exploited?

Yes. CISA added CVE-2021-0920 to the Known Exploited Vulnerabilities catalog on 23 May 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-0920 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-0920?

Apply updates per vendor instructions. Check Android's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Kernel and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2022 · Android scorecard · act-now radar.

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