Vulnerability · Published Apr 1, 2022 · Assigned by redhat
CVE-2021-3847
High 7.8
In plain English
A high-severity security flaw in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.5%top 59.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An unauthorized access to the execution of the setuid file with capabilities flaw in the Linux kernel OverlayFS subsystem was found in the way user copying a capable file from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | no fix listed | DEBIAN-CVE-2021-3847 |
| Debian:13 | linux | no fix listed | DEBIAN-CVE-2021-3847 |
| Debian:14 | linux | no fix listed | DEBIAN-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-aws | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-azure | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-azure-fde | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-gcp | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-gke | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-gkeop | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-ibm | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-intel-iotg | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-kvm | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-lowlatency | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-oracle | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-raspi | no fix listed | UBUNTU-CVE-2021-3847 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2021-3847 |
Affected products (as reported)
Weakness: CWE-281
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2009704 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/10/14/3 x_refsource_MISC