vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-3715

HIGH
7.8
CVSS Score
Published: March 2, 2022 at 10:17 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
2 products affected across 2 vendorsLinux KernelKernel

Using kernel by N/A?

Get instant alerts when new vulnerabilities affect kernel - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.8
Exploit prediction
EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
3.18 ≤ v < 4.4.2184.10 ≤ v < 4.14.1754.15 ≤ v < 4.19.1144.20 ≤ v < 5.4.294.5 ≤ v < 4.9.2185.5.0 ≤ v < 5.5.14
Affected range stops below 4.14.175, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.19.114, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.4.218, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.9.218, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.29, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.5.14, so it looks safe — our inference, not a vendor statement
Kernel· Red Hat
60%
Linux kernel 5.10

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card