CVE-2021-22555
Linux Kernel Heap Out-of-Bounds Write Vulnerability
7.8
CVSS 3.1
78.7 %
EPSS (current)
2025-10-06
KEV addition
No
Ransomware
Timeline
Publication, first public exploit and KEV addition on a day axis.
Key facts
Vendor / product: Linux / Kernel
Published: 2021-07-07 · Due (CISA): 2025-10-27
CWE: CWE-787 · EU list: no
Exploit references (metadata only)
| Source | Reference | Title | Date |
|---|---|---|---|
| metasploit | exploit/linux/local/netfilter_xtables_heap_oob_write_priv_esc | exploit/linux/local/netfilter_xtables_heap_oob_write_priv_esc | 2021-07-07 |
| exploitdb | 50135 | Linux Kernel 2.6.19 < 5.9 - 'Netfilter Local Privilege Escalation | 2021-07-15 |
References only — no downloads or instructions.