--- id: CVE-2023-42753 title: >- An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel summary: >- An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decre… severity: high cvss: 7 cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-787 - CWE-787 vendor: linux product: linux_kernel affected: - 'linux_kernel >= 4.4.165, < 4.5' - 'linux_kernel >= 4.9.141, < 4.10' - 'linux_kernel >= 4.14.84, < 4.15' - 'linux_kernel >= 4.19.5, < 4.19.295' - 'linux_kernel >= 4.20, < 5.4.257' - 'linux_kernel >= 5.5, < 5.10.195' - 'linux_kernel >= 5.11, < 5.15.132' - 'linux_kernel >= 5.16, < 6.1.53' - 'linux_kernel >= 6.2, < 6.4.16' - 'linux_kernel >= 6.5, < 6.5.3' - enterprise_linux = 7.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - debian_linux = 10.0 patched: - linux_kernel 6.5.3 published: '2023-09-25' updated: '2026-08-06' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-42753' references: - url: 'https://access.redhat.com/errata/RHSA-2023:7370' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7379' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7382' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7389' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7411' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7418' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7539' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7558' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0089' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0113' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0134' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0340' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0346' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0347' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0371' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0376' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0378' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0402' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0403' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0412' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0461' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0562' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0563' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0593' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0999' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2023-42753' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2239843' label: secalert@redhat.com - url: 'https://seclists.org/oss-sec/2023/q3/216' label: secalert@redhat.com - url: >- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7370' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7379' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7382' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7389' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7411' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7418' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7539' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7558' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0089' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0113' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0134' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0340' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0346' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0347' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0371' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0376' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0378' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0402' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0403' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0412' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0461' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0562' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0563' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0593' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0999' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/security/cve/CVE-2023-42753' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2239843' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html' 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://seclists.org/oss-sec/2023/q3/216' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.openwall.com/lists/oss-security/2023/09/22/10' label: af854a3a-2127-422b-91ae-364da2661108 tags: - nvd epss: 0.00507 epssPercentile: 0.40686 ingestedAt: '2026-08-06T23:06:28.831Z' --- ## Overview An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer out-of-bound. This issue may allow a local user to crash the system or potentially escalate their privileges on the system. ## Affected - `linux_kernel >= 4.4.165, < 4.5` - `linux_kernel >= 4.9.141, < 4.10` - `linux_kernel >= 4.14.84, < 4.15` - `linux_kernel >= 4.19.5, < 4.19.295` - `linux_kernel >= 4.20, < 5.4.257` - `linux_kernel >= 5.5, < 5.10.195` - `linux_kernel >= 5.11, < 5.15.132` - `linux_kernel >= 5.16, < 6.1.53` - `linux_kernel >= 6.2, < 6.4.16` - `linux_kernel >= 6.5, < 6.5.3` - `enterprise_linux = 7.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `debian_linux = 10.0` ## Remediation Upgrade past the affected range: - `linux_kernel 6.5.3`