high
7.1
CWE
732
Advisory Published
CVE Published
Updated

CVE-2020-24394

First published: Fri Jun 05 2020(Updated: )

A vulnerability was found in NFSv4.2 in the Linux kernel, where a server fails to apply umask correctly when creating a new object on filesystem without ACL support (for example, ext4 with the "noacl" mount option). This flaw could allow a local attacker with a user privilege to a kernel information leak problem. References: <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962254">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962254</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22cf8419f1319ff87ec759d0ebdff4cbafaee832">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22cf8419f1319ff87ec759d0ebdff4cbafaee832</a>

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-1160.11.1.rt56.1145.el7
0:3.10.0-1160.11.1.rt56.1145.el7
redhat/kernel<0:3.10.0-1160.11.1.el7
0:3.10.0-1160.11.1.el7
redhat/kernel<0:3.10.0-693.82.1.el7
0:3.10.0-693.82.1.el7
redhat/kernel<0:3.10.0-957.70.1.el7
0:3.10.0-957.70.1.el7
redhat/kernel<0:3.10.0-1062.45.1.el7
0:3.10.0-1062.45.1.el7
redhat/kernel-rt<0:4.18.0-305.rt7.72.el8
0:4.18.0-305.rt7.72.el8
redhat/kernel<0:4.18.0-305.el8
0:4.18.0-305.el8
Linux Kernel<5.7.8
Ubuntu Linux=14.04
Ubuntu Linux=16.04
Ubuntu Linux=18.04
Ubuntu Linux=20.04
openSUSE=15.1
Oracle SD-WAN Edge=8.2
StarWind Virtual SAN=v8-build12533
StarWind Virtual SAN=v8-build12658
StarWind Virtual SAN=v8-build12859
StarWind Virtual SAN=v8-build13170
StarWind Virtual SAN=v8-build13586
StarWind Virtual SAN=v8-build13861
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=20.04

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22cf8419f1319ff87ec759d0ebdff4cbafaee832

Remedy

https://www.oracle.com/security-alerts/cpuApr2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-24394?

    CVE-2020-24394 has a severity rating that can allow local attackers to access kernel information due to improper umask application.

  • How do I fix CVE-2020-24394?

    To fix CVE-2020-24394, apply the security updates provided in the corresponding kernel packages from your Linux distribution.

  • Which Linux kernel versions are affected by CVE-2020-24394?

    CVE-2020-24394 affects multiple versions of the Linux kernel, specifically versions up to 5.7.8.

  • Can CVE-2020-24394 be exploited remotely?

    CVE-2020-24394 cannot be exploited remotely as it requires local user privileges to be effective.

  • What types of systems are vulnerable to CVE-2020-24394?

    Systems running specific versions of Red Hat kernel, Ubuntu, and other distributions utilizing NFSv4.2 without ACL support are vulnerable to CVE-2020-24394.

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