CVE-2024-50163
Vulnerability from cvelistv5
Published
2024-11-07 09:31
Modified
2024-12-19 09:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Make sure internal and UAPI bpf_redirect flags don't overlap The bpf_redirect_info is shared between the SKB and XDP redirect paths, and the two paths use the same numeric flag values in the ri->flags field (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that if skb bpf_redirect_neigh() is used with a non-NULL params argument and, subsequently, an XDP redirect is performed using the same bpf_redirect_info struct, the XDP path will get confused and end up crashing, which syzbot managed to trigger. With the stack-allocated bpf_redirect_info, the structure is no longer shared between the SKB and XDP paths, so the crash doesn't happen anymore. However, different code paths using identically-numbered flag values in the same struct field still seems like a bit of a mess, so this patch cleans that up by moving the flag definitions together and redefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap with the flags used for XDP. It also adds a BUILD_BUG_ON() check to make sure the overlap is not re-introduced by mistake.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826Patch
Impacted products
Vendor Product Version
Linux Linux Version: 5.14
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/uapi/linux/bpf.h",
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "version": "6.6.59",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.11.6",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Make sure internal and UAPI bpf_redirect flags don\u0027t overlap\n\nThe bpf_redirect_info is shared between the SKB and XDP redirect paths,\nand the two paths use the same numeric flag values in the ri-\u003eflags\nfield (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that\nif skb bpf_redirect_neigh() is used with a non-NULL params argument and,\nsubsequently, an XDP redirect is performed using the same\nbpf_redirect_info struct, the XDP path will get confused and end up\ncrashing, which syzbot managed to trigger.\n\nWith the stack-allocated bpf_redirect_info, the structure is no longer\nshared between the SKB and XDP paths, so the crash doesn\u0027t happen\nanymore. However, different code paths using identically-numbered flag\nvalues in the same struct field still seems like a bit of a mess, so\nthis patch cleans that up by moving the flag definitions together and\nredefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap\nwith the flags used for XDP. It also adds a BUILD_BUG_ON() check to make\nsure the overlap is not re-introduced by mistake."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:34:26.654Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962"
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        },
        {
          "url": "https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16"
        }
      ],
      "title": "bpf: Make sure internal and UAPI bpf_redirect flags don\u0027t overlap",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50163",
    "datePublished": "2024-11-07T09:31:40.146Z",
    "dateReserved": "2024-10-21T19:36:19.961Z",
    "dateUpdated": "2024-12-19T09:34:26.654Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50163\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-07T10:15:07.627\",\"lastModified\":\"2024-11-22T17:34:53.297\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Make sure internal and UAPI bpf_redirect flags don\u0027t overlap\\n\\nThe bpf_redirect_info is shared between the SKB and XDP redirect paths,\\nand the two paths use the same numeric flag values in the ri-\u003eflags\\nfield (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that\\nif skb bpf_redirect_neigh() is used with a non-NULL params argument and,\\nsubsequently, an XDP redirect is performed using the same\\nbpf_redirect_info struct, the XDP path will get confused and end up\\ncrashing, which syzbot managed to trigger.\\n\\nWith the stack-allocated bpf_redirect_info, the structure is no longer\\nshared between the SKB and XDP paths, so the crash doesn\u0027t happen\\nanymore. However, different code paths using identically-numbered flag\\nvalues in the same struct field still seems like a bit of a mess, so\\nthis patch cleans that up by moving the flag definitions together and\\nredefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap\\nwith the flags used for XDP. It also adds a BUILD_BUG_ON() check to make\\nsure the overlap is not re-introduced by mistake.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Aseg\u00farese de que los indicadores bpf_redirect internos y de UAPI no se superpongan El bpf_redirect_info se comparte entre las rutas de redireccionamiento de SKB y XDP, y las dos rutas usan los mismos valores de indicador num\u00e9rico en el campo ri-\u0026gt;flags (espec\u00edficamente, BPF_F_BROADCAST == BPF_F_NEXTHOP). Esto significa que si se usa skb bpf_redirect_neigh() con un argumento params distinto de NULL y, posteriormente, se realiza una redirecci\u00f3n de XDP usando la misma estructura bpf_redirect_info, la ruta de XDP se confundir\u00e1 y terminar\u00e1 fallando, lo que syzbot logr\u00f3 activar. Con el bpf_redirect_info asignado a la pila, la estructura ya no se comparte entre las rutas de SKB y XDP, por lo que el bloqueo ya no ocurre. Sin embargo, el uso de diferentes rutas de c\u00f3digo que utilizan valores de indicadores numerados de manera id\u00e9ntica en el mismo campo de estructura sigue pareciendo un poco confuso, por lo que este parche soluciona el problema juntando las definiciones de indicadores y redefiniendo los tres indicadores en BPF_F_REDIRECT_INTERNAL para que no se superpongan con los indicadores utilizados para XDP. Tambi\u00e9n agrega una comprobaci\u00f3n BUILD_BUG_ON() para asegurarse de que la superposici\u00f3n no se vuelva a introducir por error.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14\",\"versionEndExcluding\":\"5.15.170\",\"matchCriteriaId\":\"53E8194F-DD7E-4112-80DD-3E7EF9172D6D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.115\",\"matchCriteriaId\":\"C08A77A6-E42E-4EFD-B5A1-2BF6CBBB42AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.59\",\"matchCriteriaId\":\"5D15CA59-D15C-4ACD-8B03-A072DEAD2081\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.6\",\"matchCriteriaId\":\"E4486B12-007B-4794-9857-F07145637AA1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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