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CVE-2021-3715

HIGHCVSS 7.8/10EPSS 0.35%

Last modified

CVE-2021-3715 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.35%

27.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel>= 3.18, < 4.4.218
LinuxLinux Kernel>= 4.5, < 4.9.218
LinuxLinux Kernel>= 4.10, < 4.14.175
LinuxLinux Kernel>= 4.15, < 4.19.114
LinuxLinux Kernel>= 4.20, < 5.4.29
LinuxLinux Kernel>= 5.5.0, < 5.5.14

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3715?
A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
How severe is CVE-2021-3715?
CVE-2021-3715 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3715?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3715?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST