CVE-2024-57975

{
  "id": "CVE-2024-57975",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "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"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "17ca04aff7e6171df684b7b65804df8830eb8c15",
              "lessThan": "5ae72abbf91eb172ce3a838a4dc34be3c9707296",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "17ca04aff7e6171df684b7b65804df8830eb8c15",
              "lessThan": "2434533f1c963e7317c45880c98287e5bed98325",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "17ca04aff7e6171df684b7b65804df8830eb8c15",
              "lessThan": "c2b47df81c8e20a8e8cd94f0d7df211137ae94ed",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/inode.c",
            "fs/btrfs/subpage.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.5"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.5",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.13",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/inode.c",
            "fs/btrfs/subpage.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-27T02:15:10.687",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2434533f1c963e7317c45880c98287e5bed98325",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ae72abbf91eb172ce3a838a4dc34be3c9707296",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c2b47df81c8e20a8e8cd94f0d7df211137ae94ed",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-459"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do proper folio cleanup when run_delalloc_nocow() failed\n\n[BUG]\nWith CONFIG_DEBUG_VM set, test case generic/476 has some chance to crash\nwith the following VM_BUG_ON_FOLIO():\n\n  BTRFS error (device dm-3): cow_file_range failed, start 1146880 end 1253375 len 106496 ret -28\n  BTRFS error (device dm-3): run_delalloc_nocow failed, start 1146880 end 1253375 len 106496 ret -28\n  page: refcount:4 mapcount:0 mapping:00000000592787cc index:0x12 pfn:0x10664\n  aops:btrfs_aops [btrfs] ino:101 dentry name(?):\"f1774\"\n  flags: 0x2fffff80004028(uptodate|lru|private|node=0|zone=2|lastcpupid=0xfffff)\n  page dumped because: VM_BUG_ON_FOLIO(!folio_test_locked(folio))\n  ------------[ cut here ]------------\n  kernel BUG at mm/page-writeback.c:2992!\n  Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n  CPU: 2 UID: 0 PID: 3943513 Comm: kworker/u24:15 Tainted: G           OE      6.12.0-rc7-custom+ #87\n  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022\n  Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs]\n  pc : folio_clear_dirty_for_io+0x128/0x258\n  lr : folio_clear_dirty_for_io+0x128/0x258\n  Call trace:\n   folio_clear_dirty_for_io+0x128/0x258\n   btrfs_folio_clamp_clear_dirty+0x80/0xd0 [btrfs]\n   __process_folios_contig+0x154/0x268 [btrfs]\n   extent_clear_unlock_delalloc+0x5c/0x80 [btrfs]\n   run_delalloc_nocow+0x5f8/0x760 [btrfs]\n   btrfs_run_delalloc_range+0xa8/0x220 [btrfs]\n   writepage_delalloc+0x230/0x4c8 [btrfs]\n   extent_writepage+0xb8/0x358 [btrfs]\n   extent_write_cache_pages+0x21c/0x4e8 [btrfs]\n   btrfs_writepages+0x94/0x150 [btrfs]\n   do_writepages+0x74/0x190\n   filemap_fdatawrite_wbc+0x88/0xc8\n   start_delalloc_inodes+0x178/0x3a8 [btrfs]\n   btrfs_start_delalloc_roots+0x174/0x280 [btrfs]\n   shrink_delalloc+0x114/0x280 [btrfs]\n   flush_space+0x250/0x2f8 [btrfs]\n   btrfs_async_reclaim_data_space+0x180/0x228 [btrfs]\n   process_one_work+0x164/0x408\n   worker_thread+0x25c/0x388\n   kthread+0x100/0x118\n   ret_from_fork+0x10/0x20\n  Code: 910a8021 a90363f7 a9046bf9 94012379 (d4210000)\n  ---[ end trace 0000000000000000 ]---\n\n[CAUSE]\nThe first two lines of extra debug messages show the problem is caused\nby the error handling of run_delalloc_nocow().\n\nE.g. we have the following dirtied range (4K blocksize 4K page size):\n\n    0                 16K                  32K\n    |//////////////////////////////////////|\n    |  Pre-allocated  |\n\nAnd the range [0, 16K) has a preallocated extent.\n\n- Enter run_delalloc_nocow() for range [0, 16K)\n  Which found range [0, 16K) is preallocated, can do the proper NOCOW\n  write.\n\n- Enter fallback_to_fow() for range [16K, 32K)\n  Since the range [16K, 32K) is not backed by preallocated extent, we\n  have to go COW.\n\n- cow_file_range() failed for range [16K, 32K)\n  So cow_file_range() will do the clean up by clearing folio dirty,\n  unlock the folios.\n\n  Now the folios in range [16K, 32K) is unlocked.\n\n- Enter extent_clear_unlock_delalloc() from run_delalloc_nocow()\n  Which is called with PAGE_START_WRITEBACK to start page writeback.\n  But folios can only be marked writeback when it's properly locked,\n  thus this triggered the VM_BUG_ON_FOLIO().\n\nFurthermore there is another hidden but common bug that\nrun_delalloc_nocow() is not clearing the folio dirty flags in its error\nhandling path.\nThis is the common bug shared between run_delalloc_nocow() and\ncow_file_range().\n\n[FIX]\n- Clear folio dirty for range [@start, @cur_offset)\n  Introduce a helper, cleanup_dirty_folios(), which\n  will find and lock the folio in the range, clear the dirty flag and\n  start/end the writeback, with the extra handling for the\n  @locked_folio.\n\n- Introduce a helper to clear folio dirty, start and end writeback\n\n- Introduce a helper to record the last failed COW range end\n  This is to trace which range we should skip, to avoid double\n  unlocking.\n\n- Skip the failed COW range for the e\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: realizar una depuración de folio adecuada cuando falla run_delalloc_nocow() [ERROR] Con CONFIG_DEBUG_VM establecido, el caso de prueba genérico/476 tiene alguna posibilidad de bloquearse con el siguiente VM_BUG_ON_FOLIO(): BTRFS error (device dm-3): cow_file_range failed, start 1146880 end 1253375 len 106496 ret -28 BTRFS error (device dm-3): run_delalloc_nocow failed, start 1146880 end 1253375 len 106496 ret -28 page: refcount:4 mapcount:0 mapping:00000000592787cc index:0x12 pfn:0x10664 aops:btrfs_aops [btrfs] ino:101 dentry name(?):\"f1774\" flags: 0x2fffff80004028(uptodate|lru|private|node=0|zone=2|lastcpupid=0xfffff) page dumped because: VM_BUG_ON_FOLIO(!folio_test_locked(folio)) ------------[ cut here ]------------ kernel BUG at mm/page-writeback.c:2992! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP CPU: 2 UID: 0 PID: 3943513 Comm: kworker/u24:15 Tainted: G OE 6.12.0-rc7-custom+ #87 Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022 Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs] pc : folio_clear_dirty_for_io+0x128/0x258 lr : folio_clear_dirty_for_io+0x128/0x258 Call trace: folio_clear_dirty_for_io+0x128/0x258 btrfs_folio_clamp_clear_dirty+0x80/0xd0 [btrfs] __process_folios_contig+0x154/0x268 [btrfs] extent_clear_unlock_delalloc+0x5c/0x80 [btrfs] run_delalloc_nocow+0x5f8/0x760 [btrfs] btrfs_run_delalloc_range+0xa8/0x220 [btrfs] writepage_delalloc+0x230/0x4c8 [btrfs] extent_writepage+0xb8/0x358 [btrfs] extent_write_cache_pages+0x21c/0x4e8 [btrfs] btrfs_writepages+0x94/0x150 [btrfs] do_writepages+0x74/0x190 filemap_fdatawrite_wbc+0x88/0xc8 start_delalloc_inodes+0x178/0x3a8 [btrfs] btrfs_start_delalloc_roots+0x174/0x280 [btrfs] shrink_delalloc+0x114/0x280 [btrfs] flush_space+0x250/0x2f8 [btrfs] btrfs_async_reclaim_data_space+0x180/0x228 [btrfs] process_one_work+0x164/0x408 worker_thread+0x25c/0x388 kthread+0x100/0x118 ret_from_fork+0x10/0x20 Code: 910a8021 a90363f7 a9046bf9 94012379 (d4210000) ---[ end trace 0000000000000000 ]--- [CAUSE] The first two lines of extra debug messages show the problem is caused by the error handling of run_delalloc_nocow(). E.g. we have the following dirtied range (4K blocksize 4K page size): 0 16K 32K |//////////////////////////////////////| | Pre-allocated | And the range [0, 16K) has a preallocated extent. - Enter run_delalloc_nocow() for range [0, 16K) Which found range [0, 16K) is preallocated, can do the proper NOCOW write. - Enter fallback_to_fow() for range [16K, 32K) Since the range [16K, 32K) is not backed by preallocated extent, we have to go COW. - cow_file_range() failed for range [16K, 32K) So cow_file_range() will do the clean up by clearing folio dirty, unlock the folios. Now the folios in range [16K, 32K) is unlocked. - Enter extent_clear_unlock_delalloc() from run_delalloc_nocow() Which is called with PAGE_START_WRITEBACK to start page writeback. Pero los folios solo se pueden marcar como escritura diferida cuando están correctamente bloqueados, por lo que esto activó VM_BUG_ON_FOLIO(). Además, hay otro error oculto pero común: run_delalloc_nocow() no borra las banderas de folio sucio en su ruta de gestión de errores. Este es el error común compartido entre run_delalloc_nocow() y cow_file_range(). [FIX] - Limpiar el folio sucio para el rango [@start, @cur_offset) Introducir un ayudante, cleanup_dirty_folios(), que encontrará y bloqueará el folio en el rango, limpiará la bandera sucia y comenzará/finalizará la escritura diferida, con el manejo adicional para @locked_folio. - Introducir un ayudante para limpiar el folio sucio, iniciar y finalizar la escritura diferida - Introducir un ayudante para registrar el último final del rango COW fallido Esto es para rastrear qué rango debemos omitir, para evitar el doble desbloqueo. - Omitir el rango COW fallido para el e ---truncado---"
    }
  ],
  "lastModified": "2026-08-04T11:22:33.390",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F4AD16DC-627B-4DDF-9FEE-C7ABEC63B62B",
              "versionEndExcluding": "6.12.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D4116B1-1BFD-4F23-BA84-169CC05FC5A3",
              "versionEndExcluding": "6.13.2",
              "versionStartIncluding": "6.13"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}