fkie_cve-2021-47013
Vulnerability from fkie_nvd
Published
2024-02-28 09:15
Modified
2024-12-09 17:59
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: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
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 *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "5330E43C-47EE-40CA-B1A9-C1AAC143732E",
                     versionEndExcluding: "4.9.269",
                     versionStartIncluding: "4.9",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "4836AF17-022D-49D0-9A8A-AF66FE8DCEB8",
                     versionEndExcluding: "4.14.233",
                     versionStartIncluding: "4.10",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "5B6E6817-19A8-4C0A-8807-71DA48CF9191",
                     versionEndExcluding: "4.19.191",
                     versionStartIncluding: "4.15",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "E07BA880-1043-4674-AC45-266B3B4A44C7",
                     versionEndExcluding: "5.4.119",
                     versionStartIncluding: "4.20",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "7A4CF5D6-ACBA-4980-ABFD-3D7A53B5BB4E",
                     versionEndExcluding: "5.10.37",
                     versionStartIncluding: "5.5",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "8CBB94EC-EC33-4464-99C5-03E5542715F0",
                     versionEndExcluding: "5.11.21",
                     versionStartIncluding: "5.11",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "D8C7052F-1B7B-4327-9C2B-84EBF3243838",
                     versionEndExcluding: "5.12.4",
                     versionStartIncluding: "5.12",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\n\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).\n\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len later.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:emac/emac-mac: Se corrige un uso after free en emac_mac_tx_buf_send En emac_mac_tx_buf_send, llama a emac_tx_fill_tpd(..,skb,..). Si ocurre algún error en emac_tx_fill_tpd(), el skb se liberará mediante dev_kfree_skb(skb) en la rama de error de emac_tx_fill_tpd(). Pero el skb liberado todavía se usa a través de skb->len por netdev_sent_queue(,skb->len). Como observé que emac_tx_fill_tpd() no ha modificado el valor de skb->len, por lo tanto mi parche asigna skb->len a 'len' antes del posible free y usa 'len' en lugar de skb->len más tarde.",
      },
   ],
   id: "CVE-2021-47013",
   lastModified: "2024-12-09T17:59:07.173",
   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: "2024-02-28T09:15:38.800",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         ],
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      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         url: "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57",
      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         ],
         url: "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
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         ],
         url: "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b",
      },
   ],
   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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