How severe is CVE-1999-1166?

CVE-1999-1166 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-1999-1166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1166?

CVE-1999-1166 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1166?

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.

When was CVE-1999-1166 published?

CVE-1999-1166 was published on 1999-07-11 and last updated on 2026-06-16.

CVE-1999-1166

CVE-1999-1166 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Linux Linux Kernel
Published: 1999-07-11
Last modified: 2026-06-16

Description

Linux 2.0.37 does not properly encode the Custom segment limit, which allows local users to gain root privileges by accessing and modifying kernel memory.

Frequently asked questions

What is CVE-1999-1166?: Linux 2.0.37 does not properly encode the Custom segment limit, which allows local users to gain root privileges by accessing and modifying kernel memory.
How severe is CVE-1999-1166?: CVE-1999-1166 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-1999-1166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1166?: CVE-1999-1166 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1166?: 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.
When was CVE-1999-1166 published?: CVE-1999-1166 was published on 1999-07-11 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:linux:linux_kernel:2.0.37:*:*:*:*:*:*:*

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