CVE-2015-3636

What it is

The ping_unhash function in net/ipv4/ping.c in the Linux kernel before 4.0.3 does not initialize a certain list data structure during an unhash operation, which allows local users to gain privileges or cause a denial of service (use-after-free and system crash) by leveraging the ability to make a SOCK_DGRAM socket system call for the IPPROTO_ICMP or IPPROTO_ICMPV6 protocol, and then making a connect system call after a disconnect.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of service disruption.

Exploit odds

2.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2015-08-06 01:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:26 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.5% in the next 30 days (EPSS).
• Severity: 4.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2015-08-06 01:59 UTC

Last modified

2026-06-17 00:26 UTC

Exploit probability

2.5% · EPSS, next 30 days

Record status

Modified

Affected

• Linux Kernel ≤ 4.0.2
• Debian Linux 7.0
• Redhat Enterprise Linux 6.0
• Canonical Ubuntu Linux 12.04

Attack profile CVSS 2.0 · 4.9

Attack vector

Local

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2015-3636.md and follow it. Check whether this project is affected by CVE-2015-3636. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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