cve-2024-56712
Vulnerability from cvelistv5
Published
2024-12-29 08:48
Modified
2025-01-20 06:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: udmabuf: fix memory leak on last export_udmabuf() error path In export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a dma_buf owning the udmabuf has already been created; but the error handling in udmabuf_create() will tear down the udmabuf without doing anything about the containing dma_buf. This leaves a dma_buf in memory that contains a dangling pointer; though that doesn't seem to lead to anything bad except a memory leak. Fix it by moving the dma_buf_fd() call out of export_udmabuf() so that we can give it different error handling. Note that the shape of this code changed a lot in commit 5e72b2b41a21 ("udmabuf: convert udmabuf driver to use folios"); but the memory leak seems to have existed since the introduction of udmabuf.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439ePatch
Impacted products
Vendor Product Version
Linux Linux Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
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   Linux Linux Version: 4.20
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/udmabuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c9fc8428d4255c2128da9c4d5cd92e554d0150cf",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "f49856f525acd5bef52ae28b7da2e001bbe7439e",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/udmabuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.7",
              "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\nudmabuf: fix memory leak on last export_udmabuf() error path\n\nIn export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a\ndma_buf owning the udmabuf has already been created; but the error handling\nin udmabuf_create() will tear down the udmabuf without doing anything about\nthe containing dma_buf.\n\nThis leaves a dma_buf in memory that contains a dangling pointer; though\nthat doesn\u0027t seem to lead to anything bad except a memory leak.\n\nFix it by moving the dma_buf_fd() call out of export_udmabuf() so that we\ncan give it different error handling.\n\nNote that the shape of this code changed a lot in commit 5e72b2b41a21\n(\"udmabuf: convert udmabuf driver to use folios\"); but the memory leak\nseems to have existed since the introduction of udmabuf."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-01-20T06:26:41.850Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e"
        }
      ],
      "title": "udmabuf: fix memory leak on last export_udmabuf() error path",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56712",
    "datePublished": "2024-12-29T08:48:46.167Z",
    "dateReserved": "2024-12-27T15:00:39.857Z",
    "dateUpdated": "2025-01-20T06:26:41.850Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56712\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-29T09:15:06.250\",\"lastModified\":\"2025-01-06T17:11:48.987\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nudmabuf: fix memory leak on last export_udmabuf() error path\\n\\nIn export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a\\ndma_buf owning the udmabuf has already been created; but the error handling\\nin udmabuf_create() will tear down the udmabuf without doing anything about\\nthe containing dma_buf.\\n\\nThis leaves a dma_buf in memory that contains a dangling pointer; though\\nthat doesn\u0027t seem to lead to anything bad except a memory leak.\\n\\nFix it by moving the dma_buf_fd() call out of export_udmabuf() so that we\\ncan give it different error handling.\\n\\nNote that the shape of this code changed a lot in commit 5e72b2b41a21\\n(\\\"udmabuf: convert udmabuf driver to use folios\\\"); but the memory leak\\nseems to have existed since the introduction of udmabuf.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udmabuf: reparar p\u00e9rdida de memoria en la \u00faltima ruta de error export_udmabuf() En export_udmabuf(), si dma_buf_fd() falla porque la tabla FD est\u00e1 llena, ya se ha creado un dma_buf que posee el udmabuf; pero la gesti\u00f3n de errores en udmabuf_create() destruir\u00e1 el udmabuf sin hacer nada con el dma_buf que lo contiene. Esto deja un dma_buf en la memoria que contiene un puntero colgante; aunque eso no parece conducir a nada malo excepto a una p\u00e9rdida de memoria. Arr\u00e9glelo moviendo la llamada dma_buf_fd() fuera de export_udmabuf() para que podamos darle un gesti\u00f3n de errores diferente. Tenga en cuenta que la forma de este c\u00f3digo cambi\u00f3 mucho en el commit 5e72b2b41a21 (\\\"udmabuf: convertir el controlador udmabuf para usar folios\\\"); Pero la p\u00e9rdida de memoria parece haber existido desde la introducci\u00f3n de udmabuf.\"}],\"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\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"6.12.7\",\"matchCriteriaId\":\"132A930B-79DA-4CD0-9863-6D6DAD5DDACA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481-106D-4B15-B4C7-FB0213B8E1D4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE491969-75AE-4A6B-9A58-8FC5AF98798F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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