What’s Vulnerable › Vulnerabilities

CVE-2018-20976

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-08-19 · updated 2026-06-17
• Weakness: CWE-416

Description

An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18. A use after free exists, related to xfs_fs_fill_super failure.

Affected products

• Linux kernel: before 4.18 — fixed in 4.18

How to fix

Upgrade to a fixed version: Linux kernel 4.18. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
• http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
• http://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
• https://access.redhat.com/errata/RHSA-2020:0178
• https://access.redhat.com/errata/RHSA-2020:0543
• https://access.redhat.com/errata/RHSA-2020:0592
• https://access.redhat.com/errata/RHSA-2020:0609
• https://access.redhat.com/errata/RHSA-2020:0661
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9fbd7bbc23dbdd73364be4d045e5d3612cf6e82
• https://lists.debian.org/debian-lts-announce/2019/09/msg00025.html
• https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html

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