High 7.0Published Sep 25, 2023

CVE-2023-42753Kernel: netfilter: potential slab-out-of-bound access due to integer underflow

Updated under an hour ago (Oct 27, 2026, 11:30 AM ET)

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It affects Red Hat Enterprise Linux 7 and 9 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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Every CVE for Red Hat Enterprise Linux 7

Exploited in the last 30 days

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.

CVSS: 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
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 7 redhat:rhel_extras_rt	from 0:3.10.0-1160.108.1.rt56.1259.el7 not affected	CNA record
Red Hat Red Hat Enterprise Linux 7 redhat:enterprise_linux	from 0:3.10.0-1160.108.1.el7 not affected	CNA record
Red Hat Red Hat Enterprise Linux 7.7 Advanced Update Support redhat:rhel_aus	from 0:3.10.0-1062.85.1.el7 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_e4s	from 0:4.18.0-193.120.1.el8_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_tus	from 0:4.18.0-193.120.1.el8_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhel_eus	8.6	CNA record
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhev_hypervisor	from 0:4.18.0-372.87.1.el8_6 not affected	CNA record
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
linux linux_kernel linux:linux_kernel	from 4.4.165 before 4.5; from 4.9.141 before 4.10; from 4.14.84 before 4.15; from 4.19.5 before 4.19.295; from 4.20 before 5.4.257; from 5.5 before 5.10.195; from 5.11 before 5.15.132; from 5.16 before 6.1.53; and 2 more ranges	NVD
redhat enterprise_linux redhat:enterprise_linux	7.0; 8.0; 9.0	NVD
1–10 of 11

References

References

https://access.redhat.com/errata/RHSA-2023:7370	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7379	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7382	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7389	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7411	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7418	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7539	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:7558	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2024:0089	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2024:0113	vendor-advisory, x-refsource-redhat, third-party-advisory
1–10 of 25

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.