CVE-2021-3543
A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.
Does this matter?
Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own.
Description
A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.
- CVSS 3.1
- 6.7 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.30% probability · 23th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-476
- Affected
- nitro enclaves project/nitro enclaves · redhat/enterprise linux · fedoraproject/fedora
- Source
- secalert@redhat.com
EPSS 0.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1953022Issue Tracking, Third Party Advisory
- https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/
- https://bugzilla.redhat.com/show_bug.cgi?id=1953022Issue Tracking, Third Party Advisory
- https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.