CVE-2011-4080: n/a vulnerability

CVE-2011-4080: The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the...

The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 23:53 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old Linux kernel access-control flaw. A local root user inside an LXC-style container could bypass intended restrictions and read the host kernel ring buffer, which may expose sensitive system details. It is not listed as known exploited in KEV, and the provided sources do not include a CVSS score. Exposure is most likely on legacy Linux systems running kernels before 2.6.39 or vendor kernels without the referenced backport, especially where untrusted users can obtain root inside LXC-style containers. Treat as a targeted legacy exposure, not a broad emergency. Prioritize internet-facing or shared container hosts only if they still run affected kernels or unsupported vendor builds. Mitigation focus: Upgrade to Linux kernel 2.6.39 or a vendor-supported kernel containing the fix.; Check distribution advisories for backported patches before relying on version numbers alone.; Restrict untrusted root access inside legacy LXC-style containers until fixed..

Prepared: Jun 24, 2026, 12:34 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 24, 2012, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://github.com/torvalds/linux/commit/bfdc0b497faa82a0ba2f9dddcf109231dd519fccCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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