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CVE-2020-24394: In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new files

37
Routine
HIGH 7.1WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2020-24394 is a high-severity flaw (CVSS 7.1) affecting linux kernel, ubuntu linux, leap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesystem lacks ACL support, aka CID-22cf8419f131. This occurs because the current umask is not considered.

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.1 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.4% (top 70%)
CISA exploited listNo
WeaknessCWE-732
Published2020-08-19
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: canonical · linux · opensuse · oracle · starwindsoftware

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

linux linux kernel UPGRADE
Affected: < 5.7.8
Fixed in: 5.7.8
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
canonical ubuntu linux MITIGATE
Affected: 14.04 · 16.04 · 18.04 · 20.04
Fixed in: no fixed release known
Safe to downgrade to: a release before 14.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse leap MITIGATE
Affected: 15.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 15.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
oracle sd-wan edge DOWNGRADE
Affected: 8.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.2
1. Check installed version
apt-cache policy sd-wan-edge || rpm -q sd-wan-edge || sd-wan-edge --version
2. No fixed release: DOWNGRADE to a release before 8.2 (Debian / Ubuntu)
apt-cache madison sd-wan-edge sudo apt install sd-wan-edge=<VERSION_BEFORE_8.2> sudo apt-mark hold sd-wan-edge
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list sd-wan-edge sudo dnf downgrade sd-wan-edge-<VERSION_BEFORE_8.2> sudo dnf versionlock add sd-wan-edge
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
starwindsoftware starwind virtual san DOWNGRADE
Affected: v8 build12533 · v8 build12658 · v8 build12859 · v8 build13170 · v8 build13586 · v8 build13861
Fixed in: no fixed release known
Safe to downgrade to: a release before v8
1. Check installed version
apt-cache policy starwind-virtual-san || rpm -q starwind-virtual-san || starwind-virtual-san --version
2. No fixed release: DOWNGRADE to a release before v8 (Debian / Ubuntu)
apt-cache madison starwind-virtual-san sudo apt install starwind-virtual-san=<VERSION_BEFORE_v8> sudo apt-mark hold starwind-virtual-san
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list starwind-virtual-san sudo dnf downgrade starwind-virtual-san-<VERSION_BEFORE_v8> sudo dnf versionlock add starwind-virtual-san
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-24394?

linux kernel: upgrade to 5.7.8; ubuntu linux: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-24394 being exploited?

CVE-2020-24394 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-24394 affect?

CVE-2020-24394 affects linux kernel, ubuntu linux, leap. Severity is high (CVSS 7.1). In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesystem lacks ACL support, aka CID-22cf8419f131. This occurs because the current umask is not considered

How urgent is CVE-2020-24394?

Priority 37/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities · Ubuntu vulnerabilities

Related CVEs

References

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