cve-2024-49881
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: update orig_path in ext4_find_extent() In ext4_find_extent(), if the path is not big enough, we free it and set *orig_path to NULL. But after reallocating and successfully initializing the path, we don't update *orig_path, in which case the caller gets a valid path but a NULL ppath, and this may cause a NULL pointer dereference or a path memory leak. For example: ext4_split_extent path = *ppath = 2000 ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path = 2000); *orig_path = path = NULL; path = kcalloc() = 3000 ext4_split_extent_at(*ppath = NULL) path = *ppath; ex = path[depth].p_ext; // NULL pointer dereference! ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000010 CPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847 RIP: 0010:ext4_split_extent_at+0x6d/0x560 Call Trace: <TASK> ext4_split_extent.isra.0+0xcb/0x1b0 ext4_ext_convert_to_initialized+0x168/0x6c0 ext4_ext_handle_unwritten_extents+0x325/0x4d0 ext4_ext_map_blocks+0x520/0xdb0 ext4_map_blocks+0x2b0/0x690 ext4_iomap_begin+0x20e/0x2c0 [...] ================================================================== Therefore, *orig_path is updated when the extent lookup succeeds, so that the caller can safely use path or *ppath.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2Patch
Impacted products
Vendor Product Version
Linux Linux Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
Version: 10809df84a4d868db61af621bae3658494165279
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   Linux Linux Version: 3.18
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{
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                        id: "CVE-2024-49881",
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               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\next4: update orig_path in ext4_find_extent()\n\nIn ext4_find_extent(), if the path is not big enough, we free it and set\n*orig_path to NULL. But after reallocating and successfully initializing\nthe path, we don't update *orig_path, in which case the caller gets a\nvalid path but a NULL ppath, and this may cause a NULL pointer dereference\nor a path memory leak. For example:\n\next4_split_extent\n  path = *ppath = 2000\n  ext4_find_extent\n    if (depth > path[0].p_maxdepth)\n      kfree(path = 2000);\n      *orig_path = path = NULL;\n      path = kcalloc() = 3000\n  ext4_split_extent_at(*ppath = NULL)\n    path = *ppath;\n    ex = path[depth].p_ext;\n    // NULL pointer dereference!\n\n==================================================================\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nCPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847\nRIP: 0010:ext4_split_extent_at+0x6d/0x560\nCall Trace:\n <TASK>\n ext4_split_extent.isra.0+0xcb/0x1b0\n ext4_ext_convert_to_initialized+0x168/0x6c0\n ext4_ext_handle_unwritten_extents+0x325/0x4d0\n ext4_ext_map_blocks+0x520/0xdb0\n ext4_map_blocks+0x2b0/0x690\n ext4_iomap_begin+0x20e/0x2c0\n[...]\n==================================================================\n\nTherefore, *orig_path is updated when the extent lookup succeeds, so that\nthe caller can safely use path or *ppath.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T09:28:16.400Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff",
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            {
               url: "https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599",
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            {
               url: "https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd",
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               url: "https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2",
            },
            {
               url: "https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42",
            },
            {
               url: "https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96",
            },
            {
               url: "https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1",
            },
         ],
         title: "ext4: update orig_path in ext4_find_extent()",
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   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-49881",
      datePublished: "2024-10-21T18:01:19.478Z",
      dateReserved: "2024-10-21T12:17:06.021Z",
      dateUpdated: "2024-12-19T09:28:16.400Z",
      state: "PUBLISHED",
   },
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-49881\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:10.560\",\"lastModified\":\"2024-11-08T16:15:29.960\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: update orig_path in ext4_find_extent()\\n\\nIn ext4_find_extent(), if the path is not big enough, we free it and set\\n*orig_path to NULL. But after reallocating and successfully initializing\\nthe path, we don't update *orig_path, in which case the caller gets a\\nvalid path but a NULL ppath, and this may cause a NULL pointer dereference\\nor a path memory leak. For example:\\n\\next4_split_extent\\n  path = *ppath = 2000\\n  ext4_find_extent\\n    if (depth > path[0].p_maxdepth)\\n      kfree(path = 2000);\\n      *orig_path = path = NULL;\\n      path = kcalloc() = 3000\\n  ext4_split_extent_at(*ppath = NULL)\\n    path = *ppath;\\n    ex = path[depth].p_ext;\\n    // NULL pointer dereference!\\n\\n==================================================================\\nBUG: kernel NULL pointer dereference, address: 0000000000000010\\nCPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847\\nRIP: 0010:ext4_split_extent_at+0x6d/0x560\\nCall Trace:\\n <TASK>\\n ext4_split_extent.isra.0+0xcb/0x1b0\\n ext4_ext_convert_to_initialized+0x168/0x6c0\\n ext4_ext_handle_unwritten_extents+0x325/0x4d0\\n ext4_ext_map_blocks+0x520/0xdb0\\n ext4_map_blocks+0x2b0/0x690\\n ext4_iomap_begin+0x20e/0x2c0\\n[...]\\n==================================================================\\n\\nTherefore, *orig_path is updated when the extent lookup succeeds, so that\\nthe caller can safely use path or *ppath.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: actualización de orig_path en ext4_find_extent() En ext4_find_extent(), si la ruta no es lo suficientemente grande, la liberamos y establecemos *orig_path en NULL. Pero después de reasignar e inicializar correctamente la ruta, no actualizamos *orig_path, en cuyo caso el llamador obtiene una ruta válida pero un ppath NULL, y esto puede causar una desreferencia de puntero NULL o una pérdida de memoria de ruta. Por ejemplo: ext4_split_extent path = *ppath = 2000 ext4_find_extent if (depth &gt; path[0].p_maxdepth) kfree(path = 2000); *orig_path = path = NULL; path = kcalloc() = 3000 ext4_split_extent_at(*ppath = NULL) path = *ppath; ex = path[depth].p_ext; // ¡Desreferencia de puntero NULL! ===================================================================== ERROR: Desreferencia de puntero NULL del núcleo, dirección: 000000000000010 CPU: 6 UID: 0 PID: 576 Comm: fsstress No contaminado 6.11.0-rc2-dirty #847 RIP: 0010:ext4_split_extent_at+0x6d/0x560 Rastreo de llamada:  ext4_split_extent.isra.0+0xcb/0x1b0 ext4_ext_convert_to_initialized+0x168/0x6c0 ext4_ext_handle_unwritten_extents+0x325/0x4d0 ext4_ext_map_blocks+0x520/0xdb0 ext4_map_blocks+0x2b0/0x690 ext4_iomap_begin+0x20e/0x2c0 [...] ====================================================================== Por lo tanto, *orig_path se actualiza cuando la búsqueda de extensión tiene éxito, de modo que el llamador puede usar path o *ppath de forma segura.\"}],\"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-476\"}]}],\"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/11b230100d6801c014fab2afabc8bdea304c1b96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49881\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:45:38.096654Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:45:41.526Z\"}}], \"cna\": {\"title\": \"ext4: update orig_path in ext4_find_extent()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"6766937d0327000ac1b87c97bbecdd28b0dd6599\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"a9fcb1717d75061d3653ed69365c8d45331815cd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"6801ed1298204d16a38571091e31178bfdc3c679\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"b63481b3a388ee2df9e295f97273226140422a42\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"11b230100d6801c014fab2afabc8bdea304c1b96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"10809df84a4d868db61af621bae3658494165279\", \"lessThan\": \"5b4b2dcace35f618fe361a87bae6f0d13af31bc1\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/extents.c\", \"fs/ext4/move_extent.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\": \"5.10.227\", \"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\", \"fs/ext4/move_extent.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff\"}, {\"url\": \"https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599\"}, {\"url\": \"https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd\"}, {\"url\": \"https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679\"}, {\"url\": \"https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2\"}, {\"url\": \"https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42\"}, {\"url\": \"https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96\"}, {\"url\": \"https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: update orig_path in ext4_find_extent()\\n\\nIn ext4_find_extent(), if the path is not big enough, we free it and set\\n*orig_path to NULL. But after reallocating and successfully initializing\\nthe path, we don't update *orig_path, in which case the caller gets a\\nvalid path but a NULL ppath, and this may cause a NULL pointer dereference\\nor a path memory leak. For example:\\n\\next4_split_extent\\n  path = *ppath = 2000\\n  ext4_find_extent\\n    if (depth > path[0].p_maxdepth)\\n      kfree(path = 2000);\\n      *orig_path = path = NULL;\\n      path = kcalloc() = 3000\\n  ext4_split_extent_at(*ppath = NULL)\\n    path = *ppath;\\n    ex = path[depth].p_ext;\\n    // NULL pointer dereference!\\n\\n==================================================================\\nBUG: kernel NULL pointer dereference, address: 0000000000000010\\nCPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847\\nRIP: 0010:ext4_split_extent_at+0x6d/0x560\\nCall Trace:\\n <TASK>\\n ext4_split_extent.isra.0+0xcb/0x1b0\\n ext4_ext_convert_to_initialized+0x168/0x6c0\\n ext4_ext_handle_unwritten_extents+0x325/0x4d0\\n ext4_ext_map_blocks+0x520/0xdb0\\n ext4_map_blocks+0x2b0/0x690\\n ext4_iomap_begin+0x20e/0x2c0\\n[...]\\n==================================================================\\n\\nTherefore, *orig_path is updated when the extent lookup succeeds, so that\\nthe caller can safely use path or *ppath.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:28:16.400Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-49881\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:28:16.400Z\", \"dateReserved\": \"2024-10-21T12:17:06.021Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:19.478Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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