Medium 5.5Published Oct 5, 2023

CVE-2023-42754Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach()

Updated under an hour ago (Oct 27, 2026, 8:25 PM ET)

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It affects Red Hat Enterprise Linux 8 and 6 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

A NULL pointer dereference flaw was found in the Linux kernel ipv4 stack. The socket buffer (skb) was assumed to be associated with a device before calling __ip_options_compile, which is not always the case if the skb is re-routed by ipvs. This issue may allow a local user with CAP_NET_ADMIN privileges to crash the system.

CVSS: 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux	from 0:4.18.0-553.rt7.342.el8_10 not affected	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	before 6.6; 6.6; 6.6	NVD
redhat enterprise_linux redhat:enterprise_linux	8.0; 9.0	NVD
fedoraproject fedora fedoraproject:fedora	37; 38; 39	NVD

References

References

https://access.redhat.com/errata/RHSA-2024:2394	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2024:2950	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2024:3138	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2023-42754	vdb-entry, x-refsource-redhat, patch, third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2239845	issue-tracking, x-refsource-redhat, patch, third-party-advisory
https://seclists.org/oss-sec/2023/q4/14	exploit, mailing-list, patch, third-party-advisory
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GISYSL3F6WIEVGHJGLC2MFNTUXHPTKQH/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GPMICQ2HVZO5UAM5KPXHAZKA2U3ZDOO6/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V5PDNWPKAP3WL5RQZ4RIDS6MG32OHH5R/
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.