What’s Vulnerable › Vulnerabilities

CVE-2019-18885

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-14 · updated 2026-06-17
• Weakness: CWE-476

Description

fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15.

Affected products

• Linux kernel: before 5.1 — fixed in 5.1

How to fix

Upgrade to a fixed version: Linux kernel 5.1. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/156185/Kernel-Live-Patch-Security-Notice-LSN-0062-1.html
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=09ba3bc9dd150457c506e4661380a6183af651c1
• https://github.com/bobfuzzer/CVE-2019-18885
• https://github.com/torvalds/linux/commit/09ba3bc9dd150457c506e4661380a6183af651c1
• https://lists.debian.org/debian-lts-announce/2020/08/msg00019.html
• https://security.netapp.com/advisory/ntap-20191205-0001/
• https://usn.ubuntu.com/4254-1/
• https://usn.ubuntu.com/4254-2/
• https://usn.ubuntu.com/4258-1/
• https://usn.ubuntu.com/4287-1/
• https://usn.ubuntu.com/4287-2/
• https://www.oracle.com/security-alerts/cpuApr2021.html

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