What’s Vulnerable › Vulnerabilities

CVE-2021-3847

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-04-01 · updated 2026-06-17
• Weakness: CWE-281

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 products

• Fedoraproject Fedora: 34
• Linux kernel: through 5.17.0

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2009704
• https://www.openwall.com/lists/oss-security/2021/10/14/3
• https://bugzilla.redhat.com/show_bug.cgi?id=2009704
• https://www.openwall.com/lists/oss-security/2021/10/14/3

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