CVE-2023-39189

Kernel: netfilter: nftables out-of-bounds read in nf_osf_match_one()

MEDIUM
6
CVSS Score
Published: October 9, 2023 at 05:57 PM UTC
Updated: October 15, 2026 at 12:16 AM UTC
3 products affected across 3 vendorsLinux KernelFedoraEnterprise Linux

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Severity
MEDIUM6
Exploit prediction
EPSS 0.4%

Description

A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 6.6
Affected range stops below 6.6, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 0:4.18.0-553.el8_10 (unaffected)
Vendor states this is fixed in 0:4.18.0-553.rt7.342.el8_10 (unaffected)
Vendor states this is fixed in 0:5.14.0-427.13.1.el9_4 (unaffected)
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

VDB Entryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2023-39189
Issue Trackingx_refsource_REDHATPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2226777
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-794697.html

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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