How severe is CVE-2011-1021?

CVE-2011-1021 has a CVSS 2.0 base score of 3.6, rated low severity.

Is CVE-2011-1021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1021?

CVE-2011-1021 primarily affects Linux Linux Kernel. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1021?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1021 published?

CVE-2011-1021 was published on 2012-06-21 and last updated on 2026-06-16.

CVE-2011-1021

CVE-2011-1021 is a low-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 3.6. 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-264.

Key facts

Severity: Low (CVSS 2.0 base score 3.6)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Linux Linux Kernel
Published: 2012-06-21
Last modified: 2026-06-16

Description

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.

Frequently asked questions

What is CVE-2011-1021?: drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.
How severe is CVE-2011-1021?: CVE-2011-1021 has a CVSS 2.0 base score of 3.6, rated low severity.
Is CVE-2011-1021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1021?: CVE-2011-1021 primarily affects Linux Linux Kernel. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1021 published?: CVE-2011-1021 was published on 2012-06-21 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc4:*:*:*:*:*:*

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