CVE-2024-26642 (GCVE-0-2024-26642)
Vulnerability from cvelistv5 – Published: 2024-03-21 10:43 – Updated: 2026-08-05 11:26
VLAI
EPSS
VEX
Title
netfilter: nf_tables: disallow anonymous set with timeout flag
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: disallow anonymous set with timeout flag
Anonymous sets are never used with timeout from userspace, reject this.
Exception to this rule is NFT_SET_EVAL to ensure legacy meters still work.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-03 17:43 UTC
Assigner
References
11 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
761da2935d6e18d178582dbdf315a3a458555505 , < e4988d8415bd0294d6f9f4a1e7095f8b50a97ca9
(git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < e9a0d3f376eb356d54ffce36e7cc37514cbfbd6f (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < fe40ffbca19dc70d7c6b1e3c77b9ccb404c57351 (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 7cdc1be24cc1bcd56a3e89ac4aef20e31ad09199 (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 72c1efe3f247a581667b7d368fff3bd9a03cd57a (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12 (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 8e07c16695583a66e81f67ce4c46e94dece47ba7 (git) Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 16603605b667b70da974bea8216c93e7db043bf1 (git) |
guessed | |
| Linux | Linux |
Affected:
4.1
Unaffected: 0 , < 4.1 (semver) Unaffected: 4.19.312 , ≤ 4.19.* (semver) Unaffected: 5.4.274 , ≤ 5.4.* (semver) Unaffected: 5.10.215 , ≤ 5.10.* (semver) Unaffected: 5.15.154 , ≤ 5.15.* (semver) Unaffected: 6.1.84 , ≤ 6.1.* (semver) Unaffected: 6.6.24 , ≤ 6.6.* (semver) Unaffected: 6.7.12 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"versionStartIncluding": "4.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.154",
"versionStartIncluding": "4.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.84",
"versionStartIncluding": "4.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.24",
"versionStartIncluding": "4.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.7.12",
"versionStartIncluding": "4.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8",
"versionStartIncluding": "4.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: disallow anonymous set with timeout flag\n\nAnonymous sets are never used with timeout from userspace, reject this.\nException to this rule is NFT_SET_EVAL to ensure legacy meters still work."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable configuration is created and destroyed through the nfnetlink/nf_tables netlink interface (NFT_MSG_NEWSET/NEWSETELEM/DELRULE), which requires a local socket on the system. Netfilter/nftables control plane is explicitly a local attack vector.\nAC:L - The attacker controls both sides of the race: they choose the per-element timeout (driving when the 1 s-interval async rhash GC worker collects elements) and issue the rule-delete/abort transaction that frees the anonymous set, and can retry the loop indefinitely until the batched GC work lands after `nft_rhash_destroy()`.\nPR:L - `nfnetlink_rcv()` requires only CAP_NET_ADMIN over the network namespace, which any unprivileged user obtains via `unshare -Urn`; nftables is fully functional per-netns, so a basic local user suffices.\nUI:N - The entire sequence \u2014 creating the table/chain/rule with the inline anonymous timeout set, adding expiring elements, and deleting the binding rule \u2014 is performed by the attacker\u0027s own process with no victim action.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale GC batch reads freed `nft_rhash_elem` memory (keys hashed by `rhashtable_remove_fast()`, extension data dereferenced by `nft_setelem_data_deactivate()`), which the attacker can reallocate and spray, yielding a kernel-memory disclosure primitive and leaking kernel pointers.\nI:H - `nft_setelem_remove()` performs rhashtable unlink writes into a freed bucket table and freed nodes, `nft_use_dec()` decrements refcounts inside reallocated objects, and the elements are later destroyed a second time \u2014 a write/decrement/double-free primitive of the class routinely leveraged for nftables local privilege escalation.\nA:H - Operating on freed elements and a destroyed rhashtable reliably produces slab corruption, refcount underflow warnings, and kernel oops/panic, and the attacker can trigger it repeatedly."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:26:30.075Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e4988d8415bd0294d6f9f4a1e7095f8b50a97ca9"
},
{
"url": "https://git.kernel.org/stable/c/e9a0d3f376eb356d54ffce36e7cc37514cbfbd6f"
},
{
"url": "https://git.kernel.org/stable/c/fe40ffbca19dc70d7c6b1e3c77b9ccb404c57351"
},
{
"url": "https://git.kernel.org/stable/c/7cdc1be24cc1bcd56a3e89ac4aef20e31ad09199"
},
{
"url": "https://git.kernel.org/stable/c/72c1efe3f247a581667b7d368fff3bd9a03cd57a"
},
{
"url": "https://git.kernel.org/stable/c/c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12"
},
{
"url": "https://git.kernel.org/stable/c/8e07c16695583a66e81f67ce4c46e94dece47ba7"
},
{
"url": "https://git.kernel.org/stable/c/16603605b667b70da974bea8216c93e7db043bf1"
}
],
"title": "netfilter: nf_tables: disallow anonymous set with timeout flag",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-26642",
"datePublished": "2024-03-21T10:43:43.495Z",
"dateReserved": "2024-02-19T14:20:24.137Z",
"dateUpdated": "2026-08-05T11:26:30.075Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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