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CVE-2023-42753

Red Hat Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.7 Advanced Update Support, Red Hat Enterprise Linux 8

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
7.8
EPSS
0.51%
41.6% percentile
CISA KEV
Not listed
Published
2023.09.26
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.51%
Technical severityCVSS 7.8

Vulnerability 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 product and versions

Product
Red Hat Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.7 Advanced Update Support, Red Hat Enterprise Linux 8
Affected versions
>= 4.4.165 < 4.5, >= 4.9.141 < 4.10, >= 4.14.84 < 4.15, >= 4.19.5 < 4.19.295, >= 4.20 < 5.4.257, >= 5.5 < 5.10.195, >= 5.11 < 5.15.132, >= 5.16 < 6.1.53, >= 6.2 < 6.4.16, >= 6.5 < 6.5.3, 7.0, 8.0, 9.0, 10.0
Fixed versions
Verify the fixed release separately for each affected product line

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Red Hat Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.7 Advanced Update Support, Red Hat Enterprise Linux 8 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787