CVE-2024-27020 (GCVE-0-2024-27020)
Vulnerability from cvelistv5 – Published: 2024-05-01 05:30 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()
nft_unregister_expr() can concurrent with __nft_expr_type_get(),
and there is not any protection when iterate over nf_tables_expressions
list in __nft_expr_type_get(). Therefore, there is potential data-race
of nf_tables_expressions list entry.
Use list_for_each_entry_rcu() to iterate over nf_tables_expressions
list in __nft_expr_type_get(), and use rcu_read_lock() in the caller
nft_expr_type_get() to protect the entire type query process.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-30 19:26 UTC
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
16 references
Impacted products
9 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < 939109c0a8e2a006a6cc8209e262d25065f4403a
(git)
Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < b38a133d37fa421c8447b383d788c9cc6f5cb34c (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < 934e66e231cff2b18faa2c8aad0b8cec13957e05 (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < 0b6de00206adbbfc6373b3ae38d2a6f197987907 (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < 8d56bad42ac4c43c6c72ddd6a654a2628bf839c5 (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < a9ebf340d123ae12582210407f879d6a5a1bc25b (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < 01f1a678b05ade4b1248019c2dcca773aebbeb7f (git) Affected: ef1f7df9170dbd875ce198ba84e6ab80f6fc139e , < f969eb84ce482331a991079ab7a5c4dc3b7f89bf (git) |
guessed | |
| Linux | Linux |
Affected:
3.13
Unaffected: 0 , < 3.13 (semver) Unaffected: 4.19.313 , ≤ 4.19.* (semver) Unaffected: 5.4.275 , ≤ 5.4.* (semver) Unaffected: 5.10.216 , ≤ 5.10.* (semver) Unaffected: 5.15.157 , ≤ 5.15.* (semver) Unaffected: 6.1.88 , ≤ 6.1.* (semver) Unaffected: 6.6.29 , ≤ 6.6.* (semver) Unaffected: 6.8.8 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed |
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"versionEndExcluding": "6.6.29",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.8",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "3.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()\n\nnft_unregister_expr() can concurrent with __nft_expr_type_get(),\nand there is not any protection when iterate over nf_tables_expressions\nlist in __nft_expr_type_get(). Therefore, there is potential data-race\nof nf_tables_expressions list entry.\n\nUse list_for_each_entry_rcu() to iterate over nf_tables_expressions\nlist in __nft_expr_type_get(), and use rcu_read_lock() in the caller\nnft_expr_type_get() to protect the entire type query process."
}
],
"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 path is reached only through NETLINK_NETFILTER messages (NFT_MSG_NEWRULE/NEWSET batches) sent by a local process on the same host. Per kernel scoring guidance, netfilter/nftables netlink configuration is a local attack vector.\nAC:L - The attacker fully controls the reader side (unbounded NFT_MSG_NEWRULE batches in one netns) and can drive the writer side by forcing expression-module autoload from a second netns, where nf_tables_module_autoload() intentionally releases commit_mutex before request_module(); because the writer holds only the global nfnl mutex and the reader only the per-netns commit_mutex, the two run concurrently with no shared lock and the race can be retried indefinitely.\nPR:L - nfnetlink gates on netlink_net_capable(skb, CAP_NET_ADMIN), which resolves to ns_capable() against the network namespace\u0027s owning user namespace, so an ordinary unprivileged user obtains it with \"unshare -Urn\". No real root or init-namespace capability is needed.\nUI:N - The attacker performs the entire sequence \u2014 creating namespaces, issuing nftables batches, and triggering module autoload \u2014 with no action by any other user or administrator.\nS:U - The race and its consequences are confined to the kernel of the same host; there is no crossing into a different security authority such as a hypervisor or IOMMU boundary.\nC:H - Losing the RCU protection lets nft_expr_type_get() retain a pointer into module memory past free_module()\u0027s synchronize_rcu(), so type-\u003eowner, type-\u003ename, type-\u003emaxattr and type-\u003epolicy are read from freed and potentially reclaimed memory; an attacker-controlled reclaim of that module-region allocation combined with the attacker-supplied nla_policy parse yields kernel memory disclosure.\nI:H - try_module_get() performs an atomic increment through a dangling type-\u003eowner pointer, giving a write into freed memory, and type-\u003eselect_ops/type-\u003eops become indirect calls through freed module-region storage that can be reclaimed (e.g. by another module load or BPF JIT allocation), making control-flow hijack achievable.\nA:H - Dereferencing the stale nft_expr_type and the freed struct module after the module\u0027s vmalloc\u0027d memory is released causes an oops or panic, and the unsynchronized traversal of a concurrently modified list can itself derail into invalid pointers."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:29:03.453Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/939109c0a8e2a006a6cc8209e262d25065f4403a"
},
{
"url": "https://git.kernel.org/stable/c/b38a133d37fa421c8447b383d788c9cc6f5cb34c"
},
{
"url": "https://git.kernel.org/stable/c/934e66e231cff2b18faa2c8aad0b8cec13957e05"
},
{
"url": "https://git.kernel.org/stable/c/0b6de00206adbbfc6373b3ae38d2a6f197987907"
},
{
"url": "https://git.kernel.org/stable/c/8d56bad42ac4c43c6c72ddd6a654a2628bf839c5"
},
{
"url": "https://git.kernel.org/stable/c/a9ebf340d123ae12582210407f879d6a5a1bc25b"
},
{
"url": "https://git.kernel.org/stable/c/01f1a678b05ade4b1248019c2dcca773aebbeb7f"
},
{
"url": "https://git.kernel.org/stable/c/f969eb84ce482331a991079ab7a5c4dc3b7f89bf"
}
],
"title": "netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-27020",
"datePublished": "2024-05-01T05:30:15.908Z",
"dateReserved": "2024-02-19T14:20:24.209Z",
"dateUpdated": "2026-08-05T11:29:03.453Z",
"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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