CVE-2023-4244

Use-after-free in Linux kernel's netfilter: nf_tables component

HIGH
7
CVSS Score
Published: September 6, 2023 at 01:53 PM UTC
Updated: July 30, 2026 at 07:29 PM UTC
2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity
HIGH7
Exploit prediction
EPSS 0.2%

Description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Due to a race condition between nf_tables netlink control plane transaction and nft_set element garbage collection, it is possible to underflow the reference counter causing a use-after-free vulnerability. We recommend upgrading past commit 3e91b0ebd994635df2346353322ac51ce84ce6d8.

Affected

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

v < 4.19.3160.0 ≤ v < 4.19.3164.20 ≤ v < 5.4.2625.11 ≤ v < 5.15.1345.16 ≤ v < 6.1.565.5 ≤ v < 5.10.1986.2 ≤ v < 6.4.116.2.0 ≤ v < 6.4.110.04.205.115.165.56.2
Affected range stops below 4.19.316, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.198, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.15.134, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.262, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.56, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

CVSS

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

Quick Info

StatusANALYZED
CWE
CWE-416

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