fkie_cve-2021-47506
Vulnerability from fkie_nvd
Published
2024-05-24 15:15
Modified
2025-01-06 20:44
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
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                     matchCriteriaId: "1FF3BCF2-4788-45E7-BDAC-845DEBF8922F",
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                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "BEC14782-2EE3-4635-A927-91559E4F451C",
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                     vulnerable: true,
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                     matchCriteriaId: "60134C3A-06E4-48C1-B04F-2903732A4E56",
                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*",
                     matchCriteriaId: "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71",
                     vulnerable: true,
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                     matchCriteriaId: "AF55383D-4DF2-45DC-93F7-571F4F978EAB",
                     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\nnfsd: fix use-after-free due to delegation race\n\nA delegation break could arrive as soon as we've called vfs_setlease.  A\ndelegation break runs a callback which immediately (in\nnfsd4_cb_recall_prepare) adds the delegation to del_recall_lru.  If we\nthen exit nfs4_set_delegation without hashing the delegation, it will be\nfreed as soon as the callback is done with it, without ever being\nremoved from del_recall_lru.\n\nSymptoms show up later as use-after-free or list corruption warnings,\nusually in the laundromat thread.\n\nI suspect aba2072f4523 \"nfsd: grant read delegations to clients holding\nwrites\" made this bug easier to hit, but I looked as far back as v3.0\nand it looks to me it already had the same problem.  So I'm not sure\nwhere the bug was introduced; it may have been there from the beginning.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: corrige el use-after-free debido a la ejecución de delegación. Una interrupción de la delegación podría llegar tan pronto como hayamos llamado a vfs_setlease. Una interrupción de la delegación ejecuta una devolución de llamada que inmediatamente (en nfsd4_cb_recall_prepare) agrega la delegación a del_recall_lru. Si luego salimos de nfs4_set_delegation sin aplicar hash a la delegación, se liberará tan pronto como finalice la devolución de llamada, sin eliminarse nunca de del_recall_lru. Los síntomas aparecen más tarde como advertencias de use-after-free o de corrupción en la lista, generalmente en el hilo de la lavandería. Sospecho que aba2072f4523 \"nfsd: otorgar delegaciones de lectura a clientes que tienen escrituras\" hizo que este error fuera más fácil de corregir, pero miré hasta la versión 3.0 y me parece que ya tenía el mismo problema. Entonces no estoy seguro de dónde se introdujo el error; puede que haya estado ahí desde el principio.",
      },
   ],
   id: "CVE-2021-47506",
   lastModified: "2025-01-06T20:44:45.983",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 7.8,
               baseSeverity: "HIGH",
               confidentialityImpact: "HIGH",
               integrityImpact: "HIGH",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 5.9,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-05-24T15:15:11.197",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebce",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3",
      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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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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      },
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         url: "https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536ee",
      },
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      },
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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         url: "https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5",
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-416",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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