CVE-2021-22555
CISA KEVPublished October 6, 2025 · Updated April 3, 2026
high
Official Description+
Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.
Affected Products
| Vendor | Product |
|---|---|
| Linux | Kernel |
Patch Status
Patch by 2025-10-27
Recommended Actions
- Check if your systems use any of the affected products listed above.
- Apply vendor patches immediately if available.
- This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
- Monitor vendor advisories for updates and additional mitigations.
- Review logs for indicators of compromise related to CVE-2021-22555.