cve-2024-56693
Vulnerability from cvelistv5
Published
2024-12-28 09:46
Modified
2025-02-10 17:21
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: brd: defer automatic disk creation until module initialization succeeds My colleague Wupeng found the following problems during fault injection: BUG: unable to handle page fault for address: fffffbfff809d073 PGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:__asan_load8+0x4c/0xa0 ... Call Trace: <TASK> blkdev_put_whole+0x41/0x70 bdev_release+0x1a3/0x250 blkdev_release+0x11/0x20 __fput+0x1d7/0x4a0 task_work_run+0xfc/0x180 syscall_exit_to_user_mode+0x1de/0x1f0 do_syscall_64+0x6b/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e loop_init() is calling loop_add() after __register_blkdev() succeeds and is ignoring disk_add() failure from loop_add(), for loop_add() failure is not fatal and successfully created disks are already visible to bdev_open(). brd_init() is currently calling brd_alloc() before __register_blkdev() succeeds and is releasing successfully created disks when brd_init() returns an error. This can cause UAF for the latter two case: case 1: T1: modprobe brd brd_init brd_alloc(0) // success add_disk disk_scan_partitions bdev_file_open_by_dev // alloc file fput // won't free until back to userspace brd_alloc(1) // failed since mem alloc error inject // error path for modprobe will release code segment // back to userspace __fput blkdev_release bdev_release blkdev_put_whole bdev->bd_disk->fops->release // fops is freed now, UAF! case 2: T1: T2: modprobe brd brd_init brd_alloc(0) // success open(/dev/ram0) brd_alloc(1) // fail // error path for modprobe close(/dev/ram0) ... /* UAF! */ bdev->bd_disk->fops->release Fix this problem by following what loop_init() does. Besides, reintroduce brd_devices_mutex to help serialize modifications to brd_list.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/259bf925583ec9e3781df778cadf00594095090dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/410896624db639500f24f46478b4bfa05c76bf56Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41219c147df8bbd6591f59af5d695fb6c9a1cbffPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63dfd728b30f79495dacc886127695a379805152Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/826cc42adf44930a633d11a5993676d85ddb0842Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0c2744cd2939ec5999c51dbaf2af16886548b7bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
Version: 7f9b348cb5e94259acdcbafbcaed55d3bb515304
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   Linux Linux Version: 5.14
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{
   containers: {
      adp: [
         {
            metrics: [
               {
                  cvssV3_1: {
                     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",
                  },
               },
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                  other: {
                     content: {
                        id: "CVE-2024-56693",
                        options: [
                           {
                              Exploitation: "none",
                           },
                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "total",
                           },
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                        role: "CISA Coordinator",
                        timestamp: "2025-02-10T17:12:21.851341Z",
                        version: "2.0.3",
                     },
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                  },
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                        description: "CWE-416 Use After Free",
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               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
         },
      ],
      cna: {
         affected: [
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               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
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               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "5.14",
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                  {
                     lessThan: "5.14",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
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                     version: "6.1.120",
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                     status: "unaffected",
                     version: "6.6.64",
                     versionType: "semver",
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                     status: "unaffected",
                     version: "6.11.11",
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                     versionType: "semver",
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                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.13",
                     versionType: "original_commit_for_fix",
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         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nbrd: defer automatic disk creation until module initialization succeeds\n\nMy colleague Wupeng found the following problems during fault injection:\n\nBUG: unable to handle page fault for address: fffffbfff809d073\nPGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:__asan_load8+0x4c/0xa0\n...\nCall Trace:\n <TASK>\n blkdev_put_whole+0x41/0x70\n bdev_release+0x1a3/0x250\n blkdev_release+0x11/0x20\n __fput+0x1d7/0x4a0\n task_work_run+0xfc/0x180\n syscall_exit_to_user_mode+0x1de/0x1f0\n do_syscall_64+0x6b/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nloop_init() is calling loop_add() after __register_blkdev() succeeds and\nis ignoring disk_add() failure from loop_add(), for loop_add() failure\nis not fatal and successfully created disks are already visible to\nbdev_open().\n\nbrd_init() is currently calling brd_alloc() before __register_blkdev()\nsucceeds and is releasing successfully created disks when brd_init()\nreturns an error. This can cause UAF for the latter two case:\n\ncase 1:\n    T1:\nmodprobe brd\n  brd_init\n    brd_alloc(0) // success\n      add_disk\n        disk_scan_partitions\n          bdev_file_open_by_dev // alloc file\n          fput // won't free until back to userspace\n    brd_alloc(1) // failed since mem alloc error inject\n  // error path for modprobe will release code segment\n  // back to userspace\n  __fput\n    blkdev_release\n      bdev_release\n        blkdev_put_whole\n          bdev->bd_disk->fops->release // fops is freed now, UAF!\n\ncase 2:\n    T1:                            T2:\nmodprobe brd\n  brd_init\n    brd_alloc(0) // success\n                                   open(/dev/ram0)\n    brd_alloc(1) // fail\n  // error path for modprobe\n\n                                   close(/dev/ram0)\n                                   ...\n                                   /* UAF! */\n                                   bdev->bd_disk->fops->release\n\nFix this problem by following what loop_init() does. Besides,\nreintroduce brd_devices_mutex to help serialize modifications to\nbrd_list.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2025-01-20T06:26:20.012Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/41219c147df8bbd6591f59af5d695fb6c9a1cbff",
            },
            {
               url: "https://git.kernel.org/stable/c/259bf925583ec9e3781df778cadf00594095090d",
            },
            {
               url: "https://git.kernel.org/stable/c/410896624db639500f24f46478b4bfa05c76bf56",
            },
            {
               url: "https://git.kernel.org/stable/c/c0c2744cd2939ec5999c51dbaf2af16886548b7b",
            },
            {
               url: "https://git.kernel.org/stable/c/63dfd728b30f79495dacc886127695a379805152",
            },
            {
               url: "https://git.kernel.org/stable/c/826cc42adf44930a633d11a5993676d85ddb0842",
            },
         ],
         title: "brd: defer automatic disk creation until module initialization succeeds",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
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   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-56693",
      datePublished: "2024-12-28T09:46:18.203Z",
      dateReserved: "2024-12-27T15:00:39.849Z",
      dateUpdated: "2025-02-10T17:21:06.885Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-56693\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-28T10:15:14.833\",\"lastModified\":\"2025-03-24T17:31:47.693\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbrd: defer automatic disk creation until module initialization succeeds\\n\\nMy colleague Wupeng found the following problems during fault injection:\\n\\nBUG: unable to handle page fault for address: fffffbfff809d073\\nPGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI\\nCPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:__asan_load8+0x4c/0xa0\\n...\\nCall Trace:\\n <TASK>\\n blkdev_put_whole+0x41/0x70\\n bdev_release+0x1a3/0x250\\n blkdev_release+0x11/0x20\\n __fput+0x1d7/0x4a0\\n task_work_run+0xfc/0x180\\n syscall_exit_to_user_mode+0x1de/0x1f0\\n do_syscall_64+0x6b/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nloop_init() is calling loop_add() after __register_blkdev() succeeds and\\nis ignoring disk_add() failure from loop_add(), for loop_add() failure\\nis not fatal and successfully created disks are already visible to\\nbdev_open().\\n\\nbrd_init() is currently calling brd_alloc() before __register_blkdev()\\nsucceeds and is releasing successfully created disks when brd_init()\\nreturns an error. This can cause UAF for the latter two case:\\n\\ncase 1:\\n    T1:\\nmodprobe brd\\n  brd_init\\n    brd_alloc(0) // success\\n      add_disk\\n        disk_scan_partitions\\n          bdev_file_open_by_dev // alloc file\\n          fput // won't free until back to userspace\\n    brd_alloc(1) // failed since mem alloc error inject\\n  // error path for modprobe will release code segment\\n  // back to userspace\\n  __fput\\n    blkdev_release\\n      bdev_release\\n        blkdev_put_whole\\n          bdev->bd_disk->fops->release // fops is freed now, UAF!\\n\\ncase 2:\\n    T1:                            T2:\\nmodprobe brd\\n  brd_init\\n    brd_alloc(0) // success\\n                                   open(/dev/ram0)\\n    brd_alloc(1) // fail\\n  // error path for modprobe\\n\\n                                   close(/dev/ram0)\\n                                   ...\\n                                   /* UAF! */\\n                                   bdev->bd_disk->fops->release\\n\\nFix this problem by following what loop_init() does. Besides,\\nreintroduce brd_devices_mutex to help serialize modifications to\\nbrd_list.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: brd: aplazar la creación automática de discos hasta que la inicialización del módulo tenga éxito. Mi colega Wupeng encontró los siguientes problemas durante la inyección de fallas: ERROR: no se puede gestionar la falla de página para la dirección: fffffbfff809d073 PGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 5 UID: 0 PID: 755 Comm: modprobe No contaminado 6.12.0-rc3+ #17 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:__asan_load8+0x4c/0xa0 ... Seguimiento de llamadas:  blkdev_put_whole+0x41/0x70 bdev_release+0x1a3/0x250 blkdev_release+0x11/0x20 __fput+0x1d7/0x4a0 task_work_run+0xfc/0x180 syscall_exit_to_user_mode+0x1de/0x1f0 do_syscall_64+0x6b/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e loop_init() está llamando a loop_add() después de que __register_blkdev() tenga éxito e ignora el error de disk_add() de loop_add(), ya que el error de loop_add() no es fatal y los discos creados correctamente ya están visibles para bdev_open().brd_init() actualmente está llamando a brd_alloc() antes de que __register_blkdev() tenga éxito y está liberando discos creados exitosamente cuando brd_init() devuelve un error. Esto puede causar UAF para los últimos dos casos: caso 1: T1: modprobe brd brd_init brd_alloc(0) // éxito add_disk disk_scan_partitions bdev_file_open_by_dev // asignar archivo fput // no se liberará hasta que regrese al espacio de usuario brd_alloc(1) // falló debido a un error de asignación de memoria inject // error la ruta para modprobe liberará el segmento de código // de regreso al espacio de usuario __fput blkdev_release bdev_release blkdev_put_whole bdev-&gt;bd_disk-&gt;fops-&gt;release // fops está liberado ahora, ¡UAF! caso 2: T1: T2: modprobe brd brd_init brd_alloc(0) // éxito open(/dev/ram0) brd_alloc(1) // error // ruta de error para modprobe close(/dev/ram0) ... /* UAF! */ bdev-&gt;bd_disk-&gt;fops-&gt;release Solucione este problema siguiendo lo que hace loop_init(). Además, vuelva a introducir brd_devices_mutex para ayudar a serializar las modificaciones a brd_list.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"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\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14\",\"versionEndExcluding\":\"5.15.174\",\"matchCriteriaId\":\"018DF5B7-C996-453C-A0E3-17831086B30F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.120\",\"matchCriteriaId\":\"09AC6122-E2A4-40FE-9D33-268A1B2EC265\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.64\",\"matchCriteriaId\":\"CA16DEE3-ABEC-4449-9F4A-7A3DC4FC36C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.11\",\"matchCriteriaId\":\"21434379-192D-472F-9B54-D45E3650E893\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.2\",\"matchCriteriaId\":\"D8882B1B-2ABC-4838-AC1D-DBDBB5764776\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/259bf925583ec9e3781df778cadf00594095090d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/410896624db639500f24f46478b4bfa05c76bf56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41219c147df8bbd6591f59af5d695fb6c9a1cbff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/63dfd728b30f79495dacc886127695a379805152\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/826cc42adf44930a633d11a5993676d85ddb0842\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c0c2744cd2939ec5999c51dbaf2af16886548b7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-56693\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-10T17:12:21.851341Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-10T17:12:23.390Z\"}}], \"cna\": {\"title\": \"brd: defer automatic disk creation until module initialization succeeds\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"41219c147df8bbd6591f59af5d695fb6c9a1cbff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"259bf925583ec9e3781df778cadf00594095090d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"410896624db639500f24f46478b4bfa05c76bf56\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"c0c2744cd2939ec5999c51dbaf2af16886548b7b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"63dfd728b30f79495dacc886127695a379805152\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7f9b348cb5e94259acdcbafbcaed55d3bb515304\", \"lessThan\": \"826cc42adf44930a633d11a5993676d85ddb0842\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/block/brd.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.174\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/block/brd.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/41219c147df8bbd6591f59af5d695fb6c9a1cbff\"}, {\"url\": \"https://git.kernel.org/stable/c/259bf925583ec9e3781df778cadf00594095090d\"}, {\"url\": \"https://git.kernel.org/stable/c/410896624db639500f24f46478b4bfa05c76bf56\"}, {\"url\": \"https://git.kernel.org/stable/c/c0c2744cd2939ec5999c51dbaf2af16886548b7b\"}, {\"url\": \"https://git.kernel.org/stable/c/63dfd728b30f79495dacc886127695a379805152\"}, {\"url\": \"https://git.kernel.org/stable/c/826cc42adf44930a633d11a5993676d85ddb0842\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbrd: defer automatic disk creation until module initialization succeeds\\n\\nMy colleague Wupeng found the following problems during fault injection:\\n\\nBUG: unable to handle page fault for address: fffffbfff809d073\\nPGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI\\nCPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:__asan_load8+0x4c/0xa0\\n...\\nCall Trace:\\n <TASK>\\n blkdev_put_whole+0x41/0x70\\n bdev_release+0x1a3/0x250\\n blkdev_release+0x11/0x20\\n __fput+0x1d7/0x4a0\\n task_work_run+0xfc/0x180\\n syscall_exit_to_user_mode+0x1de/0x1f0\\n do_syscall_64+0x6b/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nloop_init() is calling loop_add() after __register_blkdev() succeeds and\\nis ignoring disk_add() failure from loop_add(), for loop_add() failure\\nis not fatal and successfully created disks are already visible to\\nbdev_open().\\n\\nbrd_init() is currently calling brd_alloc() before __register_blkdev()\\nsucceeds and is releasing successfully created disks when brd_init()\\nreturns an error. This can cause UAF for the latter two case:\\n\\ncase 1:\\n    T1:\\nmodprobe brd\\n  brd_init\\n    brd_alloc(0) // success\\n      add_disk\\n        disk_scan_partitions\\n          bdev_file_open_by_dev // alloc file\\n          fput // won't free until back to userspace\\n    brd_alloc(1) // failed since mem alloc error inject\\n  // error path for modprobe will release code segment\\n  // back to userspace\\n  __fput\\n    blkdev_release\\n      bdev_release\\n        blkdev_put_whole\\n          bdev->bd_disk->fops->release // fops is freed now, UAF!\\n\\ncase 2:\\n    T1:                            T2:\\nmodprobe brd\\n  brd_init\\n    brd_alloc(0) // success\\n                                   open(/dev/ram0)\\n    brd_alloc(1) // fail\\n  // error path for modprobe\\n\\n                                   close(/dev/ram0)\\n                                   ...\\n                                   /* UAF! */\\n                                   bdev->bd_disk->fops->release\\n\\nFix this problem by following what loop_init() does. Besides,\\nreintroduce brd_devices_mutex to help serialize modifications to\\nbrd_list.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-01-20T06:26:20.012Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-56693\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-10T17:21:06.885Z\", \"dateReserved\": \"2024-12-27T15:00:39.849Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-28T09:46:18.203Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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