What’s Vulnerable › Vulnerabilities

CVE-2023-2156

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-09 · updated 2026-06-17
• Weakness: CWE-617

Description

A flaw was found in the networking subsystem of the Linux kernel within the handling of the RPL protocol. This issue results from the lack of proper handling of user-supplied data, which can lead to an assertion failure. This may allow an unauthenticated remote attacker to create a denial of service condition on the system.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 38
• Linux kernel: from 5.7 before 5.10.184; from 5.11 before 5.15.117; from 5.16 before 6.1.34; from 6.2 before 6.2.13; from 6.3 before 6.3.8 — fixed in 5.10.184, 5.15.117, 6.1.34, 6.2.13, 6.3.8
• Red Hat Enterprise Linux: 9.0

How to fix

Upgrade to a fixed version: Linux kernel 5.10.184, 5.15.117, 6.1.34, 6.2.13. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2023/05/17/8
• http://www.openwall.com/lists/oss-security/2023/05/17/9
• http://www.openwall.com/lists/oss-security/2023/05/18/1
• http://www.openwall.com/lists/oss-security/2023/05/19/1
• https://bugzilla.redhat.com/show_bug.cgi?id=2196292
• https://lists.debian.org/debian-lts-announce/2023/08/msg00001.html
• https://security.netapp.com/advisory/ntap-20230622-0001/
• https://www.debian.org/security/2023/dsa-5448
• https://www.debian.org/security/2023/dsa-5453
• https://www.zerodayinitiative.com/advisories/ZDI-23-547/
• http://www.openwall.com/lists/oss-security/2023/05/17/8
• http://www.openwall.com/lists/oss-security/2023/05/17/9

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