cve-2025-21641
Vulnerability from cvelistv5
Published
2025-01-19 10:17
Modified
2025-01-20 06:29
Severity ?
EPSS score ?
0.02% (0.02707)
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: sysctl: blackhole timeout: avoid using current->nsproxy As mentioned in the previous commit, 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 'pernet' structure can be obtained from the table->data using container_of().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289
Impacted products
Vendor Product Version
Linux Linux Version: 27069e7cb3d1cea9377069266acf19b9cc5ad0ae
Version: 27069e7cb3d1cea9377069266acf19b9cc5ad0ae
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   Linux Linux Version: 6.12
 Create a notification for this product.
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{
   containers: {
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "net/mptcp/ctrl.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "4c74fbdc5ab95b13945be01e6065940b68222db7",
                     status: "affected",
                     version: "27069e7cb3d1cea9377069266acf19b9cc5ad0ae",
                     versionType: "git",
                  },
                  {
                     lessThan: "92cf7a51bdae24a32c592adcdd59a773ae149289",
                     status: "affected",
                     version: "27069e7cb3d1cea9377069266acf19b9cc5ad0ae",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "net/mptcp/ctrl.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "6.12",
                  },
                  {
                     lessThan: "6.12",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.12.*",
                     status: "unaffected",
                     version: "6.12.10",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.13",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: sysctl: blackhole timeout: avoid using current->nsproxy\n\nAs mentioned in the previous commit, using the 'net' structure via\n'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'pernet' structure can be obtained from the table->data using\ncontainer_of().",
            },
         ],
         providerMetadata: {
            dateUpdated: "2025-01-20T06:29:58.708Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7",
            },
            {
               url: "https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289",
            },
         ],
         title: "mptcp: sysctl: blackhole timeout: avoid using current->nsproxy",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2025-21641",
      datePublished: "2025-01-19T10:17:58.351Z",
      dateReserved: "2024-12-29T08:45:45.727Z",
      dateUpdated: "2025-01-20T06:29:58.708Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2025-21641\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-01-19T11:15:09.643\",\"lastModified\":\"2025-01-19T11:15:09.643\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: sysctl: blackhole timeout: avoid using current->nsproxy\\n\\nAs mentioned in the previous commit, using the 'net' structure via\\n'current' is not recommended for different reasons:\\n\\n- Inconsistency: getting info from the reader's/writer's netns vs only\\n  from the opener's netns.\\n\\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\\n  syzbot [1] using acct(2).\\n\\nThe 'pernet' structure can be obtained from the table->data using\\ncontainer_of().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
   },
}


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