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Vulnerability · Published Jan 19, 2021 · Assigned by mitre

CVE-2021-3178

Medium 6.5

In plain English

A medium-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)2.4%top 15.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.12-1DEBIAN-CVE-2021-3178
Debian:13linux5.10.12-1DEBIAN-CVE-2021-3178
Debian:14linux5.10.12-1DEBIAN-CVE-2021-3178
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3178
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3178
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3178

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References