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Public proof of conceptFix available

CVE-2023-42753

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

A public proof of concept exists; no exploitation attested.

  • Published2023-09-25
  • Fixed in6.5.3 · 6.4.16 · 6.1.53 · 5.15.132 · 5.10.195 · 5.4.257
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2023-09-2520:25CVE publishedCNA

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
6.5≥ 6.5, < 6.5.36.5.3
6.x≥ 6.2, < 6.4.166.4.16
6.1≥ 5.16, < 6.1.536.1.53
5.x≥ 5.11, < 5.15.1325.15.132
5.x≥ 5.5, < 5.10.1955.10.195
5.4≥ 4.20, < 5.4.2575.4.257
4.19≥ 4.19.5, < 4.19.2954.19.295
4.x≥ 4.14.84, < 4.154.15
4.x≥ 4.9.141, < 4.104.10
4.x≥ 4.4.165, < 4.54.5
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA32 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

26 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-07

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bpftoolTuxCare:AlmaLinux:9.2all versions · fixed in 7.0.0-284.30.1.el9_2.tuxcare.els2
  • bpftoolRed Hat:rhel_eus:9.2::baseosall versions · fixed in 0:7.0.0-284.40.1.el9_2and 1 other package
  • bpftool-debuginfoRed Hat:rhel_eus:9.2::crball versions · fixed in 0:7.0.0-284.40.1.el9_2
  • bpftool-debuginfoRed Hat:rhel_eus:9.2::appstreamall versions · fixed in 0:7.0.0-284.40.1.el9_2
  • dtb-aarch64openSUSE:Leap 15.6all versions · fixed in 6.4.0-150600.23.73.1and 10 other packages
  • dtb-aarch64openSUSE:Leap 15.5all versions · fixed in 5.14.21-150500.55.31.1and 10 other packages
  • dtb-aarch64openSUSE:Leap 15.4all versions · fixed in 5.14.21-150400.24.92.1and 10 other packages
  • hyperv-daemonsAzure Linux:2all versions · fixed in 5.15.133.1-1

225 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-42753 Red Hat Product Security1,792 products fixed · 22 known affected

    kernel: netfilter: potential slab-out-of-bound access due to integer underflow

    kernel-rt as a component of Red Hat Enterprise Linux 9 · kernel-rt-core as a component of Red Hat Enterprise Linux 9 · kernel-rt-debug as a component of Red Hat Enterprise Linux 9 · +19 more

  • ICSA-25-105-08 CISA2 known affected

    ABB M2M Gateway

    ABB M2M Gateway ARM600, firmware versions = 4.1.2 <= 5.0.3 · ABB M2M Gateway SW, software versions = 5.0.1 <= 5.0.3

  • RHSA-2024:0999 Red Hat Product Security27 products fixed

    Red Hat Security Advisory: kernel security update

  • RHSA-2024:0593 Red Hat Product Security28 products fixed

    Red Hat Security Advisory: kpatch-patch security update

  • RHSA-2024:0562 Red Hat Product Security97 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2024:0563 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security update

23 more advisories

Full record on NVD

Fix

  1. Update Linux linux kernel to 6.5.3 · 6.4.16 · 6.1.53 · 5.15.132 · 5.10.195 · 5.4.257 · 4.19.295 · 4.15
  2. Vendor fix Red Hat Product Security RHSA-2024:0999 · 27 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
  3. Vendor fix Red Hat Product Security RHSA-2024:0593 · 28 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2024:0340 · 14 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  5. Workaround from the vendor Red Hat Product Security RHSA-2024:0999 · 27 productsRed Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
  6. Mitigation from the vendor CISA ICSA-25-105-08 · 2 productsMitigating factors describe conditions and circumstances that make an attack that exploits the vulnerability difficult or less likely to succeed. The following mitigations are recommended. 1. Obtain a cellular private access point (APN). A dedicated private cellular access point and respective SIM…

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2023-09-25
Last Modified
2026-11-07
NVD status
Modified
GitHub Advisory
GHSA-j66v-q82h-4f8h

Frequently asked questions

What is CVE-2023-42753?

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.

Is CVE-2023-42753 actively exploited?

A proof-of-concept exploit exists for CVE-2023-42753, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-42753?

CVE-2023-42753 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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