CVE-2025-21637 (GCVE-0-2025-21637)
Vulnerability from cvelistv5
Published
2025-01-19 10:17
Modified
2025-05-04 07:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: udp_port: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.
References
Impacted products
Vendor Product Version
Linux Linux Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: udp_port: avoid using current-\u003ensproxy\n\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\nstructure via \u0027current\u0027 is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\n  from the opener\u0027s netns.\n\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata could also be used directly, but that would\nincrease the size of this fix, while \u0027sctp.ctl_sock\u0027 still needs to be\nretrieved from \u0027net\u0027 structure."
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    "cveId": "CVE-2025-21637",
    "datePublished": "2025-01-19T10:17:55.321Z",
    "dateReserved": "2024-12-29T08:45:45.726Z",
    "dateUpdated": "2025-05-04T07:17:58.644Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21637\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-01-19T11:15:09.217\",\"lastModified\":\"2025-02-27T22:01:21.430\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: sysctl: udp_port: avoid using current-\u003ensproxy\\n\\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\\nstructure via \u0027current\u0027 is not recommended for different reasons:\\n\\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\\n  from the opener\u0027s netns.\\n\\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\\n  syzbot [1] using acct(2).\\n\\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\\ncontainer_of().\\n\\nNote that table-\u003edata could also be used directly, but that would\\nincrease the size of this fix, while \u0027sctp.ctl_sock\u0027 still needs to be\\nretrieved from \u0027net\u0027 structure.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: udp_port: evitar usar current-\u0026gt;nsproxy Como se mencion\u00f3 en un commit anterior de esta serie, no se recomienda usar la estructura \u0027net\u0027 a trav\u00e9s de \u0027current\u0027 por diferentes razones: - Inconsistencia: obtener informaci\u00f3n de los netns del lector/escritor vs solo de los netns del abridor. - current-\u0026gt;nsproxy puede ser NULL en algunos casos, lo que resulta en un \u0027Oops\u0027 (null-ptr-deref), p. ej. cuando la tarea actual est\u00e1 saliendo, como lo detect\u00f3 syzbot [1] usando acct(2). La estructura \u0027net\u0027 se puede obtener de table-\u0026gt;data usando Container_of(). Tenga en cuenta que table-\u0026gt;data tambi\u00e9n se puede usar directamente, pero eso aumentar\u00eda el tama\u00f1o de esta correcci\u00f3n, mientras que \u0027sctp.ctl_sock\u0027 a\u00fan necesita ser recuperado de la estructura \u0027net\u0027.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.177\",\"matchCriteriaId\":\"71A3AFDC-A3CA-454F-8917-E998BBDE36F8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.125\",\"matchCriteriaId\":\"9AFD566B-ECC6-46F1-92F7-12A615D5685F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.72\",\"matchCriteriaId\":\"33E12097-C88A-45B4-9677-2A961A08DD3E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.10\",\"matchCriteriaId\":\"02D604F6-10D1-4F7B-A022-0888406A1121\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481-106D-4B15-B4C7-FB0213B8E1D4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE491969-75AE-4A6B-9A58-8FC5AF98798F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"93C0660D-7FB8-4FBA-892A-B064BA71E49E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"034C36A6-C481-41F3-AE9A-D116E5BE6895\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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