fkie_cve-2025-21639
Vulnerability from fkie_nvd
Published
2025-01-19 11:15
Modified
2025-02-27 22:01
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: rto_min/max: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/246428bfb9e7db15c5cd08e1d0eca41b65af2b06Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9fc17b76fc70763780aa78b38fcf4742384044a5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c87f1f6ade56c711f8736901e330685b453e420ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9fPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
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                     matchCriteriaId: "1AE5CD38-F1CD-4FC5-91D7-8F77DE44AF25",
                     versionEndExcluding: "6.1.125",
                     versionStartIncluding: "3.13",
                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                     matchCriteriaId: "8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2",
                     vulnerable: true,
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               negate: false,
               operator: "OR",
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   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: rto_min/max: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via '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 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: rto_min/max: evitar usar current->nsproxy Como se mencionó en un commit anterior de esta serie, no se recomienda usar la estructura 'net' a través de 'current' por diferentes razones: - Inconsistencia: obtener información de los netns del lector/escritor vs solo de los netns del abridor. - current->nsproxy puede ser NULL en algunos casos, lo que resulta en un 'Oops' (null-ptr-deref), por ejemplo cuando la tarea actual está saliendo, como lo detectó syzbot [1] usando acct(2). La estructura 'net' se puede obtener de table->data usando Container_of(). Tenga en cuenta que table->data también se puede usar directamente, ya que este es el único miembro necesario de la estructura 'net', pero eso aumentaría el tamaño de esta corrección, para usar '*data' en todos los lugares donde se usa 'net->sctp.rto_min/max'.",
      },
   ],
   id: "CVE-2025-21639",
   lastModified: "2025-02-27T22:01:10.337",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2025-01-19T11:15:09.423",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
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         url: "https://git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         url: "https://git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-476",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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