CVE-2021-46999
This vulnerability is a critical use‑after‑free bug in the Linux kernel’s SCTP implementation. It can cause a kernel panic, crashing the system. The issue has been fixed in a kernel patch.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel (all versions before the patch) on systems that use the SCTP protocol. Typical users include Linux administrators and developers who run network services that rely on SCTP.
Real-world impact
An attacker could trigger a kernel panic, causing a denial of service by crashing the system.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable remotely with no authentication or user interaction. It can lead to complete loss of confidentiality, integrity, and availability, making it a critical threat.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the fix for CVE-2021-46999.
- 02Reboot the system to load the updated kernel.
NVD-referenced vendor advisory
Timeline
- Feb 28, 2024 · Feb 28, 2024PublishedDisclosed and added to the National Vulnerability Database.
- Aug 4, 2026 · 2d agoAdvisory updatedThe NVD record was last revised.
- Aug 5, 2026 · 14h agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.