CVE-2022-48620

uev (aka libuev) before 2.4.1 has a buffer overflow in epoll_wait if maxevents is a large number

Critical · published January 12, 2024

CVSS v3.1
9.8
EPSS
1%
Percentile
70.6
In the wild
Unconfirmed
What it is

🔥 A massive buffer overflow lurks in uev before version 2.4.1 that could turn your server into a playground for attackers! 🚨 Think of it like a coffee shop so packed with orders that they can’t keep track, and one wrong order spills all over the counter, causing chaos. If the maxevents value is too high, the server could overflow, letting the wrong data crash your party! An attacker could exploit this vulnerability to crash the service, leading to system instability or a complete denial of service. With a CVSS score of 9.8, this isn’t just a minor inconvenience; it could lead to a catastrophic failure of your application!

Put simply

Think of it like a coffee shop so packed with orders that they can’t keep track, and one wrong order spills all over the counter, causing chaos. If the maxevents value is too high, the server could overflow, letting the wrong data crash your party! This buffer overflow occurs in the epoll_wait function when the maxevents parameter is set excessively high, allowing malicious actors to manipulate memory and cause unpredictable behavior in the application.

What to do

An attacker could exploit this vulnerability to crash the service, leading to system instability or a complete denial of service. With a CVSS score of 9.8, this isn’t just a minor inconvenience; it could lead to a catastrophic failure of your application! Upgrade to version 2.4.1 or later immediately to patch this vulnerability. It’s also advisable to review your configurations to ensure that maxevents is set within a safe limit. Regular audits can help catch similar issues down the line. You've got this! Patch up, and you'll have your defenses solid in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01319 · 70.6th percentile
Published
2024-01-12T00:00Z
EPSS history
Timeline
  • 12 JAN 00:00Z
    uev (aka libuev) before 2.4.1 has a buffer overflow in epoll_wait if maxevents is a large number
    cvelistv5