cve-2024-49884
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2025-02-02 10:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix slab-use-after-free in ext4_split_extent_at() We hit the following use-after-free: ================================================================== BUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0 Read of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40 CPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724 Call Trace: <TASK> kasan_report+0x93/0xc0 ext4_split_extent_at+0xba8/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Allocated by task 40: __kmalloc_noprof+0x1ac/0x480 ext4_find_extent+0xf3b/0x1e70 ext4_ext_map_blocks+0x188/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Freed by task 40: kfree+0xf1/0x2b0 ext4_find_extent+0xa71/0x1e70 ext4_ext_insert_extent+0xa22/0x3260 ext4_split_extent_at+0x3ef/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ================================================================== The flow of issue triggering is as follows: ext4_split_extent_at path = *ppath ext4_ext_insert_extent(ppath) ext4_ext_create_new_leaf(ppath) ext4_find_extent(orig_path) path = *orig_path read_extent_tree_block // return -ENOMEM or -EIO ext4_free_ext_path(path) kfree(path) *orig_path = NULL a. If err is -ENOMEM: ext4_ext_dirty(path + path->p_depth) // path use-after-free !!! b. If err is -EIO and we have EXT_DEBUG defined: ext4_ext_show_leaf(path) eh = path[depth].p_hdr // path also use-after-free !!! So when trying to zeroout or fix the extent length, call ext4_find_extent() to update the path. In addition we use *ppath directly as an ext4_ext_show_leaf() input to avoid possible use-after-free when EXT_DEBUG is defined, and to avoid unnecessary path updates.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185Patch
Impacted products
Vendor Product Version
Linux Linux Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
Version: dfe5080939ea4686b3414b5d970a9b26733c57a4
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   Linux Linux Version: 3.18
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                "id": "CVE-2024-49884",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:45:15.776351Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
      }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-use-after-free in ext4_split_extent_at()\n\nWe hit the following use-after-free:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n \u003cTASK\u003e\n kasan_report+0x93/0xc0\n ext4_split_extent_at+0xba8/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nAllocated by task 40:\n __kmalloc_noprof+0x1ac/0x480\n ext4_find_extent+0xf3b/0x1e70\n ext4_ext_map_blocks+0x188/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nFreed by task 40:\n kfree+0xf1/0x2b0\n ext4_find_extent+0xa71/0x1e70\n ext4_ext_insert_extent+0xa22/0x3260\n ext4_split_extent_at+0x3ef/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\next4_split_extent_at\n  path = *ppath\n  ext4_ext_insert_extent(ppath)\n    ext4_ext_create_new_leaf(ppath)\n      ext4_find_extent(orig_path)\n        path = *orig_path\n        read_extent_tree_block\n          // return -ENOMEM or -EIO\n        ext4_free_ext_path(path)\n          kfree(path)\n        *orig_path = NULL\n  a. If err is -ENOMEM:\n  ext4_ext_dirty(path + path-\u003ep_depth)\n  // path use-after-free !!!\n  b. If err is -EIO and we have EXT_DEBUG defined:\n  ext4_ext_show_leaf(path)\n    eh = path[depth].p_hdr\n    // path also use-after-free !!!\n\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\n\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-02-02T10:14:42.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade"
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        {
          "url": "https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f"
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        {
          "url": "https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185"
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        {
          "url": "https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238"
        },
        {
          "url": "https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18"
        },
        {
          "url": "https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f"
        }
      ],
      "title": "ext4: fix slab-use-after-free in ext4_split_extent_at()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49884",
    "datePublished": "2024-10-21T18:01:21.517Z",
    "dateReserved": "2024-10-21T12:17:06.022Z",
    "dateUpdated": "2025-02-02T10:14:42.912Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49884\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:11.130\",\"lastModified\":\"2025-02-02T11:15:09.900\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix slab-use-after-free in ext4_split_extent_at()\\n\\nWe hit the following use-after-free:\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\\nCall Trace:\\n \u003cTASK\u003e\\n kasan_report+0x93/0xc0\\n ext4_split_extent_at+0xba8/0xcc0\\n ext4_split_extent.isra.0+0x18f/0x500\\n ext4_split_convert_extents+0x275/0x750\\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\\n ext4_ext_map_blocks+0xe20/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n\\nAllocated by task 40:\\n __kmalloc_noprof+0x1ac/0x480\\n ext4_find_extent+0xf3b/0x1e70\\n ext4_ext_map_blocks+0x188/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n\\nFreed by task 40:\\n kfree+0xf1/0x2b0\\n ext4_find_extent+0xa71/0x1e70\\n ext4_ext_insert_extent+0xa22/0x3260\\n ext4_split_extent_at+0x3ef/0xcc0\\n ext4_split_extent.isra.0+0x18f/0x500\\n ext4_split_convert_extents+0x275/0x750\\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\\n ext4_ext_map_blocks+0xe20/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n==================================================================\\n\\nThe flow of issue triggering is as follows:\\n\\next4_split_extent_at\\n  path = *ppath\\n  ext4_ext_insert_extent(ppath)\\n    ext4_ext_create_new_leaf(ppath)\\n      ext4_find_extent(orig_path)\\n        path = *orig_path\\n        read_extent_tree_block\\n          // return -ENOMEM or -EIO\\n        ext4_free_ext_path(path)\\n          kfree(path)\\n        *orig_path = NULL\\n  a. If err is -ENOMEM:\\n  ext4_ext_dirty(path + path-\u003ep_depth)\\n  // path use-after-free !!!\\n  b. If err is -EIO and we have EXT_DEBUG defined:\\n  ext4_ext_show_leaf(path)\\n    eh = path[depth].p_hdr\\n    // path also use-after-free !!!\\n\\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\\nto update the path.\\n\\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\\nunnecessary path updates.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de slab-use-after-free en ext4_split_extent_at() Nos topamos con el siguiente use after free: ====================================================================== ERROR: KASAN: slab-use-after-free en ext4_split_extent_at+0xba8/0xcc0 Lectura de tama\u00f1o 2 en la direcci\u00f3n ffff88810548ed08 por la tarea kworker/u20:0/40 CPU: 0 PID: 40 Comm: kworker/u20:0 No contaminado 6.9.0-dirty #724 Seguimiento de llamadas:  kasan_report+0x93/0xc0 ext4_split_extent_at+0xba8/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Asignado por la tarea 40: __kmalloc_noprof+0x1ac/0x480 ext4_find_extent+0xf3b/0x1e70 ext4_ext_map_blocks+0x188/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Liberado por la tarea 40: kfree+0xf1/0x2b0 ext4_find_extent+0xa71/0x1e70 ext4_ext_insert_extent+0xa22/0x3260 ext4_split_extent_at+0x3ef/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ==================================================================== El flujo de activaci\u00f3n del problema es el siguiente: ext4_split_extent_at path = *ppath ext4_ext_insert_extent(ppath) ext4_ext_create_new_leaf(ppath) ext4_find_extent(orig_path) path = *orig_path read_extent_tree_block // devuelve -ENOMEM o -EIO ext4_free_ext_path(path) kfree(path) *orig_path = NULL a. Si err es -ENOMEM: ext4_ext_dirty(path + path-\u0026gt;p_depth) // \u00a1\u00a1\u00a1path use after free!!! b. Si err es -EIO y tenemos EXT_DEBUG definido: ext4_ext_show_leaf(path) eh = path[depth].p_hdr // \u00a1\u00a1\u00a1La ruta tambi\u00e9n es use after free!!! Por lo tanto, cuando intente poner a cero o corregir la longitud de la extensi\u00f3n, llame a ext4_find_extent() para actualizar la ruta. Adem\u00e1s, usamos *ppath directamente como una entrada de ext4_ext_show_leaf() para evitar un posible use after free cuando se define EXT_DEBUG y para evitar actualizaciones de ruta innecesarias.\"}],\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.18\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"5C882E98-F19D-47B6-A807-73BB9ABA763C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49884\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:45:15.776351Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:45:18.895Z\"}}], \"cna\": {\"title\": \"ext4: fix slab-use-after-free in ext4_split_extent_at()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"393a46f60ea4f249dc9d496d4eb2d542f5e11ade\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"448100a29395b0c8b4c42967155849fe0fbe808f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"e52f933598b781d291b9297e39c463536da0e185\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"cafcc1bd62934547c76abf46c6d0d54f135006fe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"a5401d4c3e2a3d25643c567d26e6de327774a2c9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"8fe117790b37c84c651e2bad9efc0e7fda73c0e3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"5d949ea75bb529ea6342e83465938a3b0ac51238\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"915ac3630488af0ca194dc63b86d99802b4f6e18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfe5080939ea4686b3414b5d970a9b26733c57a4\", \"lessThan\": \"c26ab35702f8cd0cdc78f96aa5856bfb77be798f\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.290\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade\"}, {\"url\": \"https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f\"}, {\"url\": \"https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185\"}, {\"url\": \"https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe\"}, {\"url\": \"https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9\"}, {\"url\": \"https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3\"}, {\"url\": \"https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238\"}, {\"url\": \"https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18\"}, {\"url\": \"https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix slab-use-after-free in ext4_split_extent_at()\\n\\nWe hit the following use-after-free:\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\\nCall Trace:\\n \u003cTASK\u003e\\n kasan_report+0x93/0xc0\\n ext4_split_extent_at+0xba8/0xcc0\\n ext4_split_extent.isra.0+0x18f/0x500\\n ext4_split_convert_extents+0x275/0x750\\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\\n ext4_ext_map_blocks+0xe20/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n\\nAllocated by task 40:\\n __kmalloc_noprof+0x1ac/0x480\\n ext4_find_extent+0xf3b/0x1e70\\n ext4_ext_map_blocks+0x188/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n\\nFreed by task 40:\\n kfree+0xf1/0x2b0\\n ext4_find_extent+0xa71/0x1e70\\n ext4_ext_insert_extent+0xa22/0x3260\\n ext4_split_extent_at+0x3ef/0xcc0\\n ext4_split_extent.isra.0+0x18f/0x500\\n ext4_split_convert_extents+0x275/0x750\\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\\n ext4_ext_map_blocks+0xe20/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n==================================================================\\n\\nThe flow of issue triggering is as follows:\\n\\next4_split_extent_at\\n  path = *ppath\\n  ext4_ext_insert_extent(ppath)\\n    ext4_ext_create_new_leaf(ppath)\\n      ext4_find_extent(orig_path)\\n        path = *orig_path\\n        read_extent_tree_block\\n          // return -ENOMEM or -EIO\\n        ext4_free_ext_path(path)\\n          kfree(path)\\n        *orig_path = NULL\\n  a. If err is -ENOMEM:\\n  ext4_ext_dirty(path + path-\u003ep_depth)\\n  // path use-after-free !!!\\n  b. If err is -EIO and we have EXT_DEBUG defined:\\n  ext4_ext_show_leaf(path)\\n    eh = path[depth].p_hdr\\n    // path also use-after-free !!!\\n\\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\\nto update the path.\\n\\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\\nunnecessary path updates.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-02-02T10:14:42.912Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49884\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-02T10:14:42.912Z\", \"dateReserved\": \"2024-10-21T12:17:06.022Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:21.517Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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