CVE-2015-3636

Status: ModifiedMedium (4.9)—💥 PoC

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.

CVSS

Version: 2.0
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C
Base score: 4.9

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 2.47%
Percentile among all scored CVEs: 84
Score date: 10/12/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (4)

Canonical — Ubuntu Linux Debian — Debian Linux Linux — Linux Kernel Redhat — Enterprise Linux

CWEs

NVD-CWE-Other

References

Raw JSON (NVD)

Show

{
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      "value": "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."
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  "lastModified": "2026-06-17T00:26:01.093",
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  "evaluatorComment": "<a href=\"http://cwe.mitre.org/data/definitions/416.html\">CWE-416: Use After Free</a>",
  "sourceIdentifier": "cve@mitre.org"
}