CVE-2023-53619 (GCVE-0-2023-53619)
Vulnerability from cvelistv5 – Published: 2025-10-07 15:19 – Updated: 2026-08-05 09:15
VLAI
EPSS
VEX
Title
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
If nf_conntrack_init_start() fails (for example due to a
register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()
clean-up path frees the nf_ct_helper_hash map.
When built with NF_CONNTRACK=y, further netfilter modules (e.g:
netfilter_conntrack_ftp) can still be loaded and call
nf_conntrack_helpers_register(), independently of whether nf_conntrack
initialized correctly. This accesses the nf_ct_helper_hash dangling
pointer and causes a uaf, possibly leading to random memory corruption.
This patch guards nf_conntrack_helper_register() from accessing a freed
or uninitialized nf_ct_helper_hash pointer and fixes possible
uses-after-free when loading a conntrack module.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
12f7a505331e6b2754684b509f2ac8f0011ce644 , < 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7
(git)
Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 00716f25f9697d02a0d9bd622575c7c7321ba3d0 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 61c7a5256543ae7d24cd9d21853d514c8632e1e9 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 8289d422f5e484efe4a565fe18e862ecd621c175 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 05561f822f27b9fa88fa5504ddec34bf38833034 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 (git) Affected: 12f7a505331e6b2754684b509f2ac8f0011ce644 , < 6eef7a2b933885a17679eb8ed0796ddf0ee5309b (git) |
guessed | |
| Linux | Linux |
Affected:
3.6
Unaffected: 0 , < 3.6 (semver) Unaffected: 4.14.322 , ≤ 4.14.* (semver) Unaffected: 4.19.291 , ≤ 4.19.* (semver) Unaffected: 5.4.251 , ≤ 5.4.* (semver) Unaffected: 5.10.188 , ≤ 5.10.* (semver) Unaffected: 5.15.121 , ≤ 5.15.* (semver) Unaffected: 6.1.39 , ≤ 6.1.* (semver) Unaffected: 6.4.4 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Avoid nf_ct_helper_hash uses after free\n\nIf nf_conntrack_init_start() fails (for example due to a\nregister_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()\nclean-up path frees the nf_ct_helper_hash map.\n\nWhen built with NF_CONNTRACK=y, further netfilter modules (e.g:\nnetfilter_conntrack_ftp) can still be loaded and call\nnf_conntrack_helpers_register(), independently of whether nf_conntrack\ninitialized correctly. This accesses the nf_ct_helper_hash dangling\npointer and causes a uaf, possibly leading to random memory corruption.\n\nThis patch guards nf_conntrack_helper_register() from accessing a freed\nor uninitialized nf_ct_helper_hash pointer and fixes possible\nuses-after-free when loading a conntrack module."
}
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}
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This accesses the nf_ct_helper_hash dangling\\npointer and causes a uaf, possibly leading to random memory corruption.\\n\\nThis patch guards nf_conntrack_helper_register() from accessing a freed\\nor uninitialized nf_ct_helper_hash pointer and fixes possible\\nuses-after-free when loading a conntrack 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:18:19+00:00",
"cve": "CVE-2023-53619",
"id": "CVE-2023-53619",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53619.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-01T01:15:53Z",
"cve": "CVE-2023-53619",
"id": "CVE-2023-53619",
"initial_release_date": "2025-10-08T23:31:23Z",
"product_status:known_affected": "501",
"product_status:known_not_affected": "26",
"product_status:recommended": "618",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-53619",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53619.json",
"version": "54"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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