What’s Vulnerable › Vulnerabilities

CVE-2021-20268

• Severity: high (CVSS 7.8 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: 2021-03-09 · updated 2026-06-17
• Weakness: CWE-20

Description

An out-of-bounds access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Affected products

• Linux kernel: before 5.10.10 — fixed in 5.10.10

How to fix

Upgrade to a fixed version: Linux kernel 5.10.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1923816
• https://lore.kernel.org/bpf/CACAyw99bEYWJCSGqfLiJ9Jp5YE1ZsZSiJxb4RFUTwbofipf0dA%40mail.gmail.com/T/#m8929643e99bea9c18ed490a7bc2591145eac6444
• https://security.netapp.com/advisory/ntap-20210409-0006/
• https://bugzilla.redhat.com/show_bug.cgi?id=1923816
• https://lore.kernel.org/bpf/CACAyw99bEYWJCSGqfLiJ9Jp5YE1ZsZSiJxb4RFUTwbofipf0dA%40mail.gmail.com/T/#m8929643e99bea9c18ed490a7bc2591145eac6444
• https://security.netapp.com/advisory/ntap-20210409-0006/

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