CVE-2025-21635 (GCVE-0-2025-21635)
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: rds: sysctl: rds_tcp_{rcv,snd}buf: 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 per-netns structure can be obtained from the table->data using container_of(), then the 'net' one can be retrieved from the listen socket (if available).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492
Impacted products
Vendor Product Version
Linux Linux Version: c6a58ffed53612be86b758df1cdb0b0f4305e9cb
Version: c6a58ffed53612be86b758df1cdb0b0f4305e9cb
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   Linux Linux Version: 4.6
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rds/tcp.c"
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          "vendor": "Linux",
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              "negate": false,
              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: sysctl: rds_tcp_{rcv,snd}buf: 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 per-netns structure can be obtained from the table-\u003edata using\ncontainer_of(), then the \u0027net\u0027 one can be retrieved from the listen\nsocket (if available)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:17:56.511Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c"
        }
      ],
      "title": "rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current-\u003ensproxy",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21635",
    "datePublished": "2025-01-19T10:17:53.832Z",
    "dateReserved": "2024-12-29T08:45:45.726Z",
    "dateUpdated": "2025-05-04T07:17:56.511Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21635\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-01-19T11:15:09.000\",\"lastModified\":\"2025-01-19T11:15:09.000\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrds: sysctl: rds_tcp_{rcv,snd}buf: 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 per-netns structure can be obtained from the table-\u003edata using\\ncontainer_of(), then the \u0027net\u0027 one can be retrieved from the listen\\nsocket (if available).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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