What’s Vulnerable › Vulnerabilities

CVE-2019-20811

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-03 · updated 2026-06-17

Description

An issue was discovered in the Linux kernel before 5.0.6. In rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c, a reference count is mishandled, aka CID-a3e23f719f5c.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04
• Debian Linux: 8.0, 9.0
• Linux kernel: before 5.0.6 — fixed in 5.0.6

How to fix

Upgrade to a fixed version: Linux kernel 5.0.6. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3e23f719f5c4a38ffb3d30c8d7632a4ed8ccd9e
• https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
• https://usn.ubuntu.com/4527-1/
• https://www.debian.org/security/2020/dsa-4698
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3e23f719f5c4a38ffb3d30c8d7632a4ed8ccd9e
• https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
• https://usn.ubuntu.com/4527-1/
• https://www.debian.org/security/2020/dsa-4698

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