CVE-2023-42754

Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach()

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.

Affected

Red Hat · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9

CVSS v3.1 NVD

5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.43% chance of exploitation in the next 30 days, 35th percentile

Published

2023-10-05

Updated

2026-10-14

Proof-of-concept exploits (1)

• https://seclists.org/oss-sec/2023/q4/14

Security advisories

• https://access.redhat.com/security/cve/CVE-2023-42754
• https://bugzilla.redhat.com/show_bug.cgi?id=2239845

References

• CVE Record
• NVD entry