CVE-2023-2156 — A flaw was found in the networking subsystem of the Linux kernel within the hand

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

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / Linux kernel (RPL protocol)	Reproducible on the latest mainline.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-09T00:00:00.000Z
• Last modified: 2024-08-02T06:12:20.503Z

09References

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