cve-2024-49868
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:27
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix a NULL pointer dereference when failed to start a new trasacntion [BUG] Syzbot reported a NULL pointer dereference with the following crash: FAULT_INJECTION: forcing a failure. start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676 prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642 relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678 ... BTRFS info (device loop0): balance: ended with status: -12 Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667] RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926 Call Trace: <TASK> commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496 btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430 del_balance_item fs/btrfs/volumes.c:3678 [inline] reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742 btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f [CAUSE] The allocation failure happens at the start_transaction() inside prepare_to_relocate(), and during the error handling we call unset_reloc_control(), which makes fs_info->balance_ctl to be NULL. Then we continue the error path cleanup in btrfs_balance() by calling reset_balance_state() which will call del_balance_item() to fully delete the balance item in the root tree. However during the small window between set_reloc_contrl() and unset_reloc_control(), we can have a subvolume tree update and created a reloc_root for that subvolume. Then we go into the final btrfs_commit_transaction() of del_balance_item(), and into btrfs_update_reloc_root() inside commit_fs_roots(). That function checks if fs_info->reloc_ctl is in the merge_reloc_tree stage, but since fs_info->reloc_ctl is NULL, it results a NULL pointer dereference. [FIX] Just add extra check on fs_info->reloc_ctl inside btrfs_update_reloc_root(), before checking fs_info->reloc_ctl->merge_reloc_tree. That DEAD_RELOC_TREE handling is to prevent further modification to the reloc tree during merge stage, but since there is no reloc_ctl at all, we do not need to bother that.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1282f001cbf56e5dd6e90a18e205a566793f4be0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37fee9c220b92c3b7bf22b51c51dde5364e7590bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39356ec0e319ed07627b3a0f402d0608546509e6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ad0c5868f2f0418619089513d95230c66cb7eb4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3b47f49e83197e8dffd023ec568403bcdbb774bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d13249c0df7aab885acb149695f82c54c0822a70Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d73d48acf36f57362df7e4f9d76568168bf5e944Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc02c1440705e3451abd1c2c8114a5c1bb188e9fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2024-49868",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:47:20.255256Z",
                "version": "2.0.3"
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              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2024-10-22T13:48:52.367Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.285",
              "versionType": "semver"
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              "version": "5.10.227",
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              "version": "6.1.113",
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            {
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              "version": "6.10.14",
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              "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\nbtrfs: fix a NULL pointer dereference when failed to start a new trasacntion\n\n[BUG]\nSyzbot reported a NULL pointer dereference with the following crash:\n\n  FAULT_INJECTION: forcing a failure.\n   start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676\n   prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642\n   relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678\n  ...\n  BTRFS info (device loop0): balance: ended with status: -12\n  Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI\n  KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667]\n  RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926\n  Call Trace:\n   \u003cTASK\u003e\n   commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496\n   btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430\n   del_balance_item fs/btrfs/volumes.c:3678 [inline]\n   reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742\n   btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574\n   btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673\n   vfs_ioctl fs/ioctl.c:51 [inline]\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\n   __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n[CAUSE]\nThe allocation failure happens at the start_transaction() inside\nprepare_to_relocate(), and during the error handling we call\nunset_reloc_control(), which makes fs_info-\u003ebalance_ctl to be NULL.\n\nThen we continue the error path cleanup in btrfs_balance() by calling\nreset_balance_state() which will call del_balance_item() to fully delete\nthe balance item in the root tree.\n\nHowever during the small window between set_reloc_contrl() and\nunset_reloc_control(), we can have a subvolume tree update and created a\nreloc_root for that subvolume.\n\nThen we go into the final btrfs_commit_transaction() of\ndel_balance_item(), and into btrfs_update_reloc_root() inside\ncommit_fs_roots().\n\nThat function checks if fs_info-\u003ereloc_ctl is in the merge_reloc_tree\nstage, but since fs_info-\u003ereloc_ctl is NULL, it results a NULL pointer\ndereference.\n\n[FIX]\nJust add extra check on fs_info-\u003ereloc_ctl inside\nbtrfs_update_reloc_root(), before checking\nfs_info-\u003ereloc_ctl-\u003emerge_reloc_tree.\n\nThat DEAD_RELOC_TREE handling is to prevent further modification to the\nreloc tree during merge stage, but since there is no reloc_ctl at all,\nwe do not need to bother that."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:27:54.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1282f001cbf56e5dd6e90a18e205a566793f4be0"
        },
        {
          "url": "https://git.kernel.org/stable/c/d73d48acf36f57362df7e4f9d76568168bf5e944"
        },
        {
          "url": "https://git.kernel.org/stable/c/37fee9c220b92c3b7bf22b51c51dde5364e7590b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d13249c0df7aab885acb149695f82c54c0822a70"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ad0c5868f2f0418619089513d95230c66cb7eb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc02c1440705e3451abd1c2c8114a5c1bb188e9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/39356ec0e319ed07627b3a0f402d0608546509e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3b47f49e83197e8dffd023ec568403bcdbb774b"
        }
      ],
      "title": "btrfs: fix a NULL pointer dereference when failed to start a new trasacntion",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49868",
    "datePublished": "2024-10-21T18:01:10.722Z",
    "dateReserved": "2024-10-21T12:17:06.019Z",
    "dateUpdated": "2024-12-19T09:27:54.412Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49868\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:06.623\",\"lastModified\":\"2024-11-08T16:15:29.227\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix a NULL pointer dereference when failed to start a new trasacntion\\n\\n[BUG]\\nSyzbot reported a NULL pointer dereference with the following crash:\\n\\n  FAULT_INJECTION: forcing a failure.\\n   start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676\\n   prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642\\n   relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678\\n  ...\\n  BTRFS info (device loop0): balance: ended with status: -12\\n  Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI\\n  KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667]\\n  RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926\\n  Call Trace:\\n   \u003cTASK\u003e\\n   commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496\\n   btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430\\n   del_balance_item fs/btrfs/volumes.c:3678 [inline]\\n   reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742\\n   btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574\\n   btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673\\n   vfs_ioctl fs/ioctl.c:51 [inline]\\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\\n   __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893\\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\n[CAUSE]\\nThe allocation failure happens at the start_transaction() inside\\nprepare_to_relocate(), and during the error handling we call\\nunset_reloc_control(), which makes fs_info-\u003ebalance_ctl to be NULL.\\n\\nThen we continue the error path cleanup in btrfs_balance() by calling\\nreset_balance_state() which will call del_balance_item() to fully delete\\nthe balance item in the root tree.\\n\\nHowever during the small window between set_reloc_contrl() and\\nunset_reloc_control(), we can have a subvolume tree update and created a\\nreloc_root for that subvolume.\\n\\nThen we go into the final btrfs_commit_transaction() of\\ndel_balance_item(), and into btrfs_update_reloc_root() inside\\ncommit_fs_roots().\\n\\nThat function checks if fs_info-\u003ereloc_ctl is in the merge_reloc_tree\\nstage, but since fs_info-\u003ereloc_ctl is NULL, it results a NULL pointer\\ndereference.\\n\\n[FIX]\\nJust add extra check on fs_info-\u003ereloc_ctl inside\\nbtrfs_update_reloc_root(), before checking\\nfs_info-\u003ereloc_ctl-\u003emerge_reloc_tree.\\n\\nThat DEAD_RELOC_TREE handling is to prevent further modification to the\\nreloc tree during merge stage, but since there is no reloc_ctl at all,\\nwe do not need to bother that.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: corrige una desreferencia de puntero NULL cuando no se puede iniciar una nueva transacci\u00f3n [ERROR] Syzbot inform\u00f3 una desreferencia de puntero NULL con el siguiente bloqueo: FAULT_INJECTION: forzando un fallo. start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676 prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642 relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678 ... Informaci\u00f3n de BTRFS (dispositivo loop0): balance: finalizado con estado: -12 Vaya: error de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref en el rango [0x000000000000660-0x0000000000000667] RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926 Seguimiento de llamadas:  commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496 btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430 del_balance_item fs/btrfs/volumes.c:3678 [en l\u00ednea] reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742 btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f [CAUSA] El fallo de asignaci\u00f3n ocurre en start_transaction() dentro de prepare_to_relocate(), y durante el manejo de errores llamamos a unset_reloc_control(), lo que hace que fs_info-\u0026gt;balance_ctl sea NULL. Luego continuamos con la limpieza de la ruta de error en btrfs_balance() llamando a reset_balance_state() que llamar\u00e1 a del_balance_item() para eliminar por completo el elemento de balance en el \u00e1rbol ra\u00edz. Sin embargo, durante la peque\u00f1a ventana entre set_reloc_contrl() y unset_reloc_control(), podemos tener una actualizaci\u00f3n del \u00e1rbol de subvolumen y crear un reloc_root para ese subvolumen. Luego pasamos a la btrfs_commit_transaction() final de del_balance_item() y a btrfs_update_reloc_root() dentro de commit_fs_roots(). Esa funci\u00f3n verifica si fs_info-\u0026gt;reloc_ctl est\u00e1 en la etapa merge_reloc_tree, pero dado que fs_info-\u0026gt;reloc_ctl es NULL, da como resultado una desreferencia de puntero NULL. [SOLUCI\u00d3N] Solo hay que a\u00f1adir una comprobaci\u00f3n adicional en fs_info-\u0026gt;reloc_ctl dentro de btrfs_update_reloc_root(), antes de comprobar fs_info-\u0026gt;reloc_ctl-\u0026gt;merge_reloc_tree. El manejo de DEAD_RELOC_TREE sirve para evitar modificaciones adicionales del \u00e1rbol de reubicaci\u00f3n durante la etapa de fusi\u00f3n, pero como no hay ning\u00fan reloc_ctl, no tenemos que preocuparnos por eso.\"}],\"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:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"EB525A44-6338-4857-AD90-EA2860D1AD1F\"},{\"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/1282f001cbf56e5dd6e90a18e205a566793f4be0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37fee9c220b92c3b7bf22b51c51dde5364e7590b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/39356ec0e319ed07627b3a0f402d0608546509e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7ad0c5868f2f0418619089513d95230c66cb7eb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c3b47f49e83197e8dffd023ec568403bcdbb774b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d13249c0df7aab885acb149695f82c54c0822a70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d73d48acf36f57362df7e4f9d76568168bf5e944\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dc02c1440705e3451abd1c2c8114a5c1bb188e9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49868\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:47:20.255256Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:47:23.940Z\"}}], \"cna\": {\"title\": \"btrfs: fix a NULL pointer dereference when failed to start a new trasacntion\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"1282f001cbf56e5dd6e90a18e205a566793f4be0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"d73d48acf36f57362df7e4f9d76568168bf5e944\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"37fee9c220b92c3b7bf22b51c51dde5364e7590b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"d13249c0df7aab885acb149695f82c54c0822a70\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"7ad0c5868f2f0418619089513d95230c66cb7eb4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"dc02c1440705e3451abd1c2c8114a5c1bb188e9f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"39356ec0e319ed07627b3a0f402d0608546509e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"c3b47f49e83197e8dffd023ec568403bcdbb774b\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/relocation.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.4.285\", \"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/btrfs/relocation.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1282f001cbf56e5dd6e90a18e205a566793f4be0\"}, {\"url\": \"https://git.kernel.org/stable/c/d73d48acf36f57362df7e4f9d76568168bf5e944\"}, {\"url\": \"https://git.kernel.org/stable/c/37fee9c220b92c3b7bf22b51c51dde5364e7590b\"}, {\"url\": \"https://git.kernel.org/stable/c/d13249c0df7aab885acb149695f82c54c0822a70\"}, {\"url\": \"https://git.kernel.org/stable/c/7ad0c5868f2f0418619089513d95230c66cb7eb4\"}, {\"url\": \"https://git.kernel.org/stable/c/dc02c1440705e3451abd1c2c8114a5c1bb188e9f\"}, {\"url\": \"https://git.kernel.org/stable/c/39356ec0e319ed07627b3a0f402d0608546509e6\"}, {\"url\": \"https://git.kernel.org/stable/c/c3b47f49e83197e8dffd023ec568403bcdbb774b\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix a NULL pointer dereference when failed to start a new trasacntion\\n\\n[BUG]\\nSyzbot reported a NULL pointer dereference with the following crash:\\n\\n  FAULT_INJECTION: forcing a failure.\\n   start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676\\n   prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642\\n   relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678\\n  ...\\n  BTRFS info (device loop0): balance: ended with status: -12\\n  Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI\\n  KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667]\\n  RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926\\n  Call Trace:\\n   \u003cTASK\u003e\\n   commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496\\n   btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430\\n   del_balance_item fs/btrfs/volumes.c:3678 [inline]\\n   reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742\\n   btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574\\n   btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673\\n   vfs_ioctl fs/ioctl.c:51 [inline]\\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\\n   __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893\\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\n[CAUSE]\\nThe allocation failure happens at the start_transaction() inside\\nprepare_to_relocate(), and during the error handling we call\\nunset_reloc_control(), which makes fs_info-\u003ebalance_ctl to be NULL.\\n\\nThen we continue the error path cleanup in btrfs_balance() by calling\\nreset_balance_state() which will call del_balance_item() to fully delete\\nthe balance item in the root tree.\\n\\nHowever during the small window between set_reloc_contrl() and\\nunset_reloc_control(), we can have a subvolume tree update and created a\\nreloc_root for that subvolume.\\n\\nThen we go into the final btrfs_commit_transaction() of\\ndel_balance_item(), and into btrfs_update_reloc_root() inside\\ncommit_fs_roots().\\n\\nThat function checks if fs_info-\u003ereloc_ctl is in the merge_reloc_tree\\nstage, but since fs_info-\u003ereloc_ctl is NULL, it results a NULL pointer\\ndereference.\\n\\n[FIX]\\nJust add extra check on fs_info-\u003ereloc_ctl inside\\nbtrfs_update_reloc_root(), before checking\\nfs_info-\u003ereloc_ctl-\u003emerge_reloc_tree.\\n\\nThat DEAD_RELOC_TREE handling is to prevent further modification to the\\nreloc tree during merge stage, but since there is no reloc_ctl at all,\\nwe do not need to bother that.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:27:54.412Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49868\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:27:54.412Z\", \"dateReserved\": \"2024-10-21T12:17:06.019Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:10.722Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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