# CVE-2023-3772: Kernel: xfrm: null pointer dereference in xfrm_update_ae_params() Status: published. Published: 2023-07-25. Updated: 2026-11-07. A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to directly dereference a NULL pointer in xfrm_update_ae_params(), leading to a possible kernel crash and denial of service. ## Remediation No remediation reported in collected sources ## Affected products and versions - Red Hat / Red Hat Enterprise Linux 8 (kernel-rt): ≥ 0:4.18.0-513.5.1.rt7.307.el8_9; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8 (kernel): ≥ 0:4.18.0-513.5.1.el8_9; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support (kernel): ≥ 0:4.18.0-372.87.1.el8_6; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support (kernel): ≥ 0:4.18.0-477.43.1.el8_8; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9 (kernel): ≥ 0:5.14.0-362.8.1.el9_3; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 (kernel): ≥ 0:4.18.0-372.87.1.el8_6; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 6 (kernel): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 7 (kernel): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 7 (kernel-rt): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9 (kernel-rt): Version range not reported. Source: CNA: redhat - Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP - Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP - Siemens / SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: ≥ 0; < V1.1 (affected, custom). Source: ADP: siemens-SADP - Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP ## Severity and prioritization - CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat - CISA KEV: No listing in collected sources - EPSS: 0.47% as of 2026-11-07; percentile 41.31% - SSVC: Not available - Weaknesses: CWE-476 ## Exploit evidence No exploit evidence in collected sources. This is not proof of no exploitation. ## References - https://access.redhat.com/errata/RHSA-2023:6583 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2023:6901 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2023:7077 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2024:0412 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2024:0575 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/security/cve/CVE-2023-3772 (CNA: redhat; vdb-entry, x_refsource_REDHAT) - https://bugzilla.redhat.com/show_bug.cgi?id=2218943 (CNA: redhat; issue-tracking, x_refsource_REDHAT) - http://www.openwall.com/lists/oss-security/2023/08/10/1 (ADP: CVE; x_transferred) - http://www.openwall.com/lists/oss-security/2023/08/10/3 (ADP: CVE; x_transferred) - https://access.redhat.com/errata/RHSA-2023:6583 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/errata/RHSA-2023:6901 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/errata/RHSA-2023:7077 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/errata/RHSA-2024:0412 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/errata/RHSA-2024:0575 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/security/cve/CVE-2023-3772 (ADP: CVE; vdb-entry, x_refsource_REDHAT, x_transferred) - https://bugzilla.redhat.com/show_bug.cgi?id=2218943 (ADP: CVE; issue-tracking, x_refsource_REDHAT, x_transferred) - https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html (ADP: CVE; x_transferred) - https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html (ADP: CVE; x_transferred) - https://www.debian.org/security/2023/dsa-5492 (ADP: CVE; x_transferred) - https://cert-portal.siemens.com/productcert/html/ssa-794697.html (ADP: siemens-SADP) - https://cert-portal.siemens.com/productcert/html/ssa-398330.html (ADP: siemens-SADP) ## Provenance - CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2023-3772; retrieved 2026-11-07; source updated 2026-11-07 - FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-3772; retrieved 2026-11-07; source updated Not reported Revision: a0a08e56423bce21cf5c49842de5ea4b460f307a751c268da606cb57ed989f3c Canonical: https://y2.dev/cve/CVE-2023-3772 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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