What’s Vulnerable › Vulnerabilities

CVE-2019-20934

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-28 · updated 2026-06-17
• Weakness: CWE-416

Description

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

Affected products

• Linux kernel: from 4.19 before 4.19.64; from 5.2 through 5.2.17; 5.3-rc1 — fixed in 4.19.64

How to fix

Upgrade to a fixed version: Linux kernel 4.19.64. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/project-zero/issues/detail?id=1913
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1913
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33

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