How severe is CVE-2021-3600?

CVE-2021-3600 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3600 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3600?

CVE-2021-3600 primarily affects Linux Linux Kernel. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3600?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2021-3600 have an EU (EUVD) identifier?

Yes. CVE-2021-3600 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-26906.

When was CVE-2021-3600 published?

CVE-2021-3600 was published on 2024-01-08 and last updated on 2026-06-17.

CVE-2021-3600

CVE-2021-3600 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-26906
Weakness: CWE-125
Affected product: Linux Linux Kernel
Published: 2024-01-08
Last modified: 2026-06-17

Description

It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.

Frequently asked questions

What is CVE-2021-3600?: It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.
How severe is CVE-2021-3600?: CVE-2021-3600 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3600 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3600?: CVE-2021-3600 primarily affects Linux Linux Kernel. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3600?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-3600 have an EU (EUVD) identifier?: Yes. CVE-2021-3600 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-26906.
When was CVE-2021-3600 published?: CVE-2021-3600 was published on 2024-01-08 and last updated on 2026-06-17.

References

Affected products (13)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

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