{"id":"CVE-2023-42754","title":"A NULL pointer dereference flaw was found in the Linux kernel ipv4 stack","summary":"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 ipv…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476","CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 6.6","linux_kernel = 6.6","enterprise_linux = 8.0","enterprise_linux = 9.0","fedora = 37","fedora = 38","fedora = 39"],"patched":["linux_kernel 6.6"],"published":"2023-10-05","updated":"2026-10-15","sourceUpdated":"2026-10-15T00:16:37.403","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-42754","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2394","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2950","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:3138","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2023-42754","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2239845","label":"secalert@redhat.com"},{"url":"https://seclists.org/oss-sec/2023/q4/14","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2394","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:2950","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:3138","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/CVE-2023-42754","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2239845","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GISYSL3F6WIEVGHJGLC2MFNTUXHPTKQH/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GPMICQ2HVZO5UAM5KPXHAZKA2U3ZDOO6/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V5PDNWPKAP3WL5RQZ4RIDS6MG32OHH5R/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/oss-sec/2023/q4/14","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-769027.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-794697.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.00404,"epssPercentile":0.32951,"ingestedAt":"2026-10-15T01:08:04.207Z","slug":"CVE-2023-42754","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `linux_kernel < 6.6`\n- `linux_kernel = 6.6`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `fedora = 37`\n- `fedora = 38`\n- `fedora = 39`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.6`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}