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PatchSiren cyber security CVE debrief

CVE-2021-22600 Linux CVE debrief

CVE-2021-22600 is a Linux kernel privilege escalation vulnerability that CISA has placed in its Known Exploited Vulnerabilities catalog. Because it is listed as known exploited, it should be treated as an urgent patching item for any environment running affected Linux kernel versions. The supplied records direct defenders to apply updates per vendor instructions.

Vendor
Linux
Product
Kernel
CVSS
MEDIUM 6.6
CISA KEV
Listed
Original CVE published
2022-04-11
Original CVE updated
2022-04-11
Advisory published
2022-04-11
Advisory updated
2022-04-11

Who should care

Security teams, Linux administrators, server and endpoint operations teams, and vulnerability management owners responsible for systems running the Linux kernel should prioritize this CVE. Any organization with Linux hosts should verify exposure and remediation status.

Technical summary

The available source corpus identifies this issue as a Linux kernel privilege escalation vulnerability, but does not provide deeper technical specifics. The key defensive point is that CISA considers it a known exploited vulnerability, which indicates active abuse or credible exploitation evidence and warrants prompt remediation through vendor-provided updates.

Defensive priority

Urgent. Because CISA lists CVE-2021-22600 in the Known Exploited Vulnerabilities catalog, organizations should prioritize remediation over routine patch queues and verify that Linux kernel updates are applied promptly.

Recommended defensive actions

  • Review Linux systems for the affected kernel versions referenced by your vendor advisories and internal asset inventory.
  • Apply vendor-recommended kernel updates as soon as operationally feasible.
  • Confirm remediation across servers, workstations, containers, and virtual machine images that rely on the Linux kernel.
  • Track patch completion against the CISA KEV due date of 2022-05-02 for historical context and use equivalent urgency for any still-unremediated systems.
  • Monitor vendor security advisories and internal detection/telemetry for signs of unauthorized privilege escalation activity.

Evidence notes

The supplied corpus identifies the vulnerability as CVE-2021-22600, a Linux kernel privilege escalation issue, and marks it as a CISA Known Exploited Vulnerability. CISA metadata shows dateAdded 2022-04-11 and dueDate 2022-05-02, with the required action to apply updates per vendor instructions. The corpus also points to the CVE.org and NVD records for official reference.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-22600 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-22600

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-22600 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-22600

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.