Linux Kernel
YES - ON THE CISA KEV LIST
CVE-2021-22600
Linux Kernel Privilege Escalation Vulnerability
overdue since 2022-05-02
Linux: 32 entries (1.8% of all KEV entries are from this vendor); 9 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
Description
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.
Required action (CISA)
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-22600
References
Other KEV entries for this vendor: Linux
- CVE-2026-46300 - Kernel (2026-10-28)
- CVE-2025-39964 - Kernel (2026-09-18)
- CVE-2026-53266 - Kernel (2026-09-18)
- CVE-2025-39682 - Kernel (2026-09-18)
- CVE-2026-53362 - Kernel (2026-08-27)
- CVE-2022-0995 - Kernel (2026-08-26)
- CVE-2022-0492 - Kernel (2026-06-02)
- CVE-2026-31431 - Kernel (2026-05-01)
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