CVE-2024-27019 (GCVE-0-2024-27019)
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_obj_type_get()
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get()
nft_unregister_obj() can concurrent with __nft_obj_type_get(),
and there is not any protection when iterate over nf_tables_objects
list in __nft_obj_type_get(). Therefore, there is potential data-race
of nf_tables_objects list entry.
Use list_for_each_entry_rcu() to iterate over nf_tables_objects
list in __nft_obj_type_get(), and use rcu_read_lock() in the caller
nft_obj_type_get() to protect the entire type query process.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:40 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < cade34279c2249eafe528564bd2e203e4ff15f88
(git)
Affected: e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < 379bf7257bc5f2a1b1ca8514e08a871b7bf6d920 (git) Affected: e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < df7c0fb8c2b9f9cac65659332581b19682a71349 (git) Affected: e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < ad333578f736d56920e090d7db1f8dec891d815e (git) Affected: e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < 4ca946b19caf655a08d5e2266d4d5526025ebb73 (git) Affected: e50092404c1bc7aaeb0a0f4077fa6f07b073a20f , < d78d867dcea69c328db30df665be5be7d0148484 (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 5.10.219 , ≤ 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 |
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.29",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.8",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "4.10",
"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_obj_type_get()\n\nnft_unregister_obj() can concurrent with __nft_obj_type_get(),\nand there is not any protection when iterate over nf_tables_objects\nlist in __nft_obj_type_get(). Therefore, there is potential data-race\nof nf_tables_objects list entry.\n\nUse list_for_each_entry_rcu() to iterate over nf_tables_objects\nlist in __nft_obj_type_get(), and use rcu_read_lock() in the caller\nnft_obj_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 code is reached only through the nfnetlink/nf_tables netlink socket via an NFT_MSG_NEWOBJ batch message, which requires a local process on the system. There is no remote or adjacent-network path into `__nft_obj_type_get()`.\nAC:L - The attacker fully controls the racing reader side and can issue NFT_MSG_NEWOBJ batches in a tight loop with no rate limiting or retry penalty, and can independently drive the list-mutation side through on-demand module autoload (`nft_request_module()` \u2192 `nf_tables_module_autoload()`, which drops `commit_mutex` around `request_module()`). Nothing about winning the window depends on state the attacker cannot influence or repeatedly re-attempt.\nPR:L - The only gate is `netlink_net_capable(skb, CAP_NET_ADMIN)`, which is evaluated against the network namespace\u0027s owning user namespace, so an ordinary unprivileged user obtains it with `unshare -Urn`. No real root or CAP_SYS_ADMIN in the initial namespace is required to reach the unsynchronized list walk.\nUI:N - The attacker triggers the entire sequence from their own process by sending netlink messages; no victim action, mount, file open, or administrator interaction is needed.\nS:U - The race and its consequences are confined to the kernel\u0027s own security authority \u2014 this is standard in-kernel memory corruption with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The unprotected traversal can dereference `struct nft_object_type` fields in module memory already released by `free_mod_mem()`, and the stale pointer is propagated into `nft_obj_init()` where `type-\u003emaxattr` and `type-\u003epolicy` steer a `kmalloc_array()` and `nla_parse_nested()`, giving an attacker-influenceable read out of reallocated kernel memory.\nI:H - `try_module_get(type-\u003eowner)` performs an atomic increment through a dangling pointer, and `nft_obj_init()` then invokes `type-\u003eselect_ops()` and `ops-\u003einit()` \u2014 indirect calls through function pointers read from freed vmalloc\u0027d module memory that can be reoccupied by a later module load or spray, yielding a control-flow hijack primitive.\nA:H - Following a stale list entry or a garbage `type-\u003eowner`/`select_ops` pointer produces an oops or panic, and the use-after-free reliably crashes the kernel even when not weaponized further."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:29:02.381Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/cade34279c2249eafe528564bd2e203e4ff15f88"
},
{
"url": "https://git.kernel.org/stable/c/379bf7257bc5f2a1b1ca8514e08a871b7bf6d920"
},
{
"url": "https://git.kernel.org/stable/c/df7c0fb8c2b9f9cac65659332581b19682a71349"
},
{
"url": "https://git.kernel.org/stable/c/ad333578f736d56920e090d7db1f8dec891d815e"
},
{
"url": "https://git.kernel.org/stable/c/4ca946b19caf655a08d5e2266d4d5526025ebb73"
},
{
"url": "https://git.kernel.org/stable/c/d78d867dcea69c328db30df665be5be7d0148484"
}
],
"title": "netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-27019",
"datePublished": "2024-05-01T05:30:11.319Z",
"dateReserved": "2024-02-19T14:20:24.209Z",
"dateUpdated": "2026-08-05T11:29:02.381Z",
"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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