CVE-2024-27020 (GCVE-0-2024-27020)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:30 – Updated: 2026-08-05 11:29
VLAI
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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
Impacted 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)
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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)
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Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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    "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"
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: netfilter: nf_tables: corrige una posible ejecuci\u00f3n de datos en __nft_expr_type_get() nft_unregister_expr() puede concurrente con __nft_expr_type_get(), y no hay ninguna protecci\u00f3n cuando se itera sobre la lista nf_tables_expressions en __nft_expr_type_get() . Por lo tanto, existe una posible ejecuci\u00f3n de datos en la entrada de la lista nf_tables_expressions. 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      "current_release_date": "2026-08-18T14:31:11+00:00",
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      "initial_release_date": "2024-05-01T00:00:00+00:00",
      "product_status:fixed": "929",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "15",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-27020.json",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"939109c0a8e2a006a6cc8209e262d25065f4403a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"b38a133d37fa421c8447b383d788c9cc6f5cb34c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"934e66e231cff2b18faa2c8aad0b8cec13957e05\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"0b6de00206adbbfc6373b3ae38d2a6f197987907\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"8d56bad42ac4c43c6c72ddd6a654a2628bf839c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"a9ebf340d123ae12582210407f879d6a5a1bc25b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"01f1a678b05ade4b1248019c2dcca773aebbeb7f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef1f7df9170dbd875ce198ba84e6ab80f6fc139e\", \"lessThan\": \"f969eb84ce482331a991079ab7a5c4dc3b7f89bf\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.313\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.275\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.29\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.313\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.275\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.157\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.88\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.29\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:03.453Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-27020\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:03.453Z\", \"dateReserved\": \"2024-02-19T14:20:24.209Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:30:15.908Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.