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CVE-2023-4569

Kernel: information leak in nft_set_catchall_flush in net/netfilter/nf_tables_api.c

MEDIUM
5.5
CVSS Score
Published: August 28, 2023 at 09:46 PM UTC
Updated: June 17, 2026 at 06:38 AM UTC
3 products affected across 3 vendorsLinux KernelDebian LinuxEnterprise Linux

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

A memory leak flaw was found in nft_set_catchall_flush in net/netfilter/nf_tables_api.c in the Linux Kernel. This issue may allow a local attacker to cause double-deactivations of catchall elements, which can result in a memory leak.

Affected

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

Debian Linux· Debiandrupal
95%
12.0
Linux Kernel· Linux
95%
v < 6.56.5 rc16.5 rc26.5 rc36.5 rc46.5 rc56.5 rc6
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
95%
8.09.0
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 8 (unaffected)
Vendor states this is fixed in 9 (unaffected)

Remediation

No guide yet

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

Patch and advisory references

References (4)

VDB Entryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2023-4569
Issue Trackingx_refsource_REDHATPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2235470
Mailing ListPatch
Source: [email protected]
https://patchwork.ozlabs.org/project/netfilter-devel/patch/[email protected]/
Third Party Advisory
Source: [email protected]
https://www.debian.org/security/2023/dsa-5492

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-402CWE-401

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