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Exploited vulnerability · CISA KEV

Is CVE-2021-22600 exploited? Yes: in CISA KEV since 11 Apr 2022

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

Yes. CVE-2021-22600, Linux Kernel Privilege Escalation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Apr 2022, 75 days after it was published. It affects Linux Kernel. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 11 Apr 2022
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity6.6CVSS 3.1 · medium
US federal due2 May 2022BOD 22-01 deadline

What it is

Linux Kernel contains a flaw in the packet socket (AF_PACKET) implementation which could lead to incorrectly freeing memory. A local user could exploit this for denial-of-service (DoS) or possibly for privilege escalation.

VendorLinux (32 exploited CVEs in KEV)
ProductKernel
VulnerabilityLinux Kernel Privilege Escalation Vulnerability
WeaknessCWE-415
Published26 Jan 2022
Added to KEV11 Apr 2022
Reported by (CNA)Google

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 Linux 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 26 Jan 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for Linux.

Other exploited CVEs in Kernel

References

Questions

Is CVE-2021-22600 being exploited?

Yes. CISA added CVE-2021-22600 to the Known Exploited Vulnerabilities catalog on 11 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-22600 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-2021-22600?

Apply updates per vendor instructions. Check Linux'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 April 2022 · Linux scorecard · act-now radar.

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