Vulnerability · Published Jun 1, 2021 · Assigned by redhat
CVE-2021-3543
Medium 6.7
In plain English
A medium-severity use-after-free in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.7Medium
Exploit odds (30 days)0.3%top 77.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-305.3.1.el8_4 | ALSA-2021:2168 |
| Debian:12 | linux | 5.10.38-1 | DEBIAN-CVE-2021-3543 |
| Debian:13 | linux | 5.10.38-1 | DEBIAN-CVE-2021-3543 |
| Debian:14 | linux | 5.10.38-1 | DEBIAN-CVE-2021-3543 |
| Rocky Linux:8 | kernel | 0:4.18.0-305.3.1.el8_4 | RLSA-2021:2168 |
Affected products (as reported)
Weakness: CWE-416
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1953022 x_refsource_MISC
- https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/ x_refsource_MISC