CVE-2025-21754

{
  "id": "CVE-2025-21754",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "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": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a",
              "lessThan": "927b930f117bbae730a853c1dc43da8afe8380fa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a",
              "lessThan": "0ff88c2a742a7cbaa4d08507d864737d099b435a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a",
              "lessThan": "8ea8db4216d1029527ab4666f730650419451e32",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a",
              "lessThan": "0d85f5c2dd91df6b5da454406756f463ba923b69",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/ordered-data.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.5",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.78",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.14",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/ordered-data.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-27T03:15:16.050",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d85f5c2dd91df6b5da454406756f463ba923b69",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0ff88c2a742a7cbaa4d08507d864737d099b435a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8ea8db4216d1029527ab4666f730650419451e32",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/927b930f117bbae730a853c1dc43da8afe8380fa",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix assertion failure when splitting ordered extent after transaction abort\n\nIf while we are doing a direct IO write a transaction abort happens, we\nmark all existing ordered extents with the BTRFS_ORDERED_IOERR flag (done\nat btrfs_destroy_ordered_extents()), and then after that if we enter\nbtrfs_split_ordered_extent() and the ordered extent has bytes left\n(meaning we have a bio that doesn't cover the whole ordered extent, see\ndetails at btrfs_extract_ordered_extent()), we will fail on the following\nassertion at btrfs_split_ordered_extent():\n\n   ASSERT(!(flags & ~BTRFS_ORDERED_TYPE_FLAGS));\n\nbecause the BTRFS_ORDERED_IOERR flag is set and the definition of\nBTRFS_ORDERED_TYPE_FLAGS is just the union of all flags that identify the\ntype of write (regular, nocow, prealloc, compressed, direct IO, encoded).\n\nFix this by returning an error from btrfs_extract_ordered_extent() if we\nfind the BTRFS_ORDERED_IOERR flag in the ordered extent. The error will\nbe the error that resulted in the transaction abort or -EIO if no\ntransaction abort happened.\n\nThis was recently reported by syzbot with the following trace:\n\n   FAULT_INJECTION: forcing a failure.\n   name failslab, interval 1, probability 0, space 0, times 1\n   CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller #0\n   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n   Call Trace:\n    <TASK>\n    __dump_stack lib/dump_stack.c:94 [inline]\n    dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n    fail_dump lib/fault-inject.c:53 [inline]\n    should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154\n    should_failslab+0xac/0x100 mm/failslab.c:46\n    slab_pre_alloc_hook mm/slub.c:4072 [inline]\n    slab_alloc_node mm/slub.c:4148 [inline]\n    __do_kmalloc_node mm/slub.c:4297 [inline]\n    __kmalloc_noprof+0xdd/0x4c0 mm/slub.c:4310\n    kmalloc_noprof include/linux/slab.h:905 [inline]\n    kzalloc_noprof include/linux/slab.h:1037 [inline]\n    btrfs_chunk_alloc_add_chunk_item+0x244/0x1100 fs/btrfs/volumes.c:5742\n    reserve_chunk_space+0x1ca/0x2c0 fs/btrfs/block-group.c:4292\n    check_system_chunk fs/btrfs/block-group.c:4319 [inline]\n    do_chunk_alloc fs/btrfs/block-group.c:3891 [inline]\n    btrfs_chunk_alloc+0x77b/0xf80 fs/btrfs/block-group.c:4187\n    find_free_extent_update_loop fs/btrfs/extent-tree.c:4166 [inline]\n    find_free_extent+0x42d1/0x5810 fs/btrfs/extent-tree.c:4579\n    btrfs_reserve_extent+0x422/0x810 fs/btrfs/extent-tree.c:4672\n    btrfs_new_extent_direct fs/btrfs/direct-io.c:186 [inline]\n    btrfs_get_blocks_direct_write+0x706/0xfa0 fs/btrfs/direct-io.c:321\n    btrfs_dio_iomap_begin+0xbb7/0x1180 fs/btrfs/direct-io.c:525\n    iomap_iter+0x697/0xf60 fs/iomap/iter.c:90\n    __iomap_dio_rw+0xeb9/0x25b0 fs/iomap/direct-io.c:702\n    btrfs_dio_write fs/btrfs/direct-io.c:775 [inline]\n    btrfs_direct_write+0x610/0xa30 fs/btrfs/direct-io.c:880\n    btrfs_do_write_iter+0x2a0/0x760 fs/btrfs/file.c:1397\n    do_iter_readv_writev+0x600/0x880\n    vfs_writev+0x376/0xba0 fs/read_write.c:1050\n    do_pwritev fs/read_write.c:1146 [inline]\n    __do_sys_pwritev2 fs/read_write.c:1204 [inline]\n    __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195\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   RIP: 0033:0x7f1281f85d29\n   RSP: 002b:00007f12819fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148\n   RAX: ffffffffffffffda RBX: 00007f1282176080 RCX: 00007f1281f85d29\n   RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005\n   RBP: 00007f12819fe090 R08: 0000000000000000 R09: 0000000000000003\n   R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000002\n   R13: 0000000000000000 R14: 00007f1282176080 R15: 00007ffcb9e23328\n    </TASK>\n   BTRFS error (device loop0 state A): Transaction aborted (error -12)\n   BTRFS: error (device loop0 state A\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: corrige el error de aserción al dividir la extensión ordenada después de la interrupción de la transacción Si mientras estamos realizando una escritura de E/S directa ocurre una interrupción de la transacción, marcamos todas las extensiones ordenadas existentes con el indicador BTRFS_ORDERED_IOERR (hecho en btrfs_destroy_ordered_extents()), y luego de eso si ingresamos btrfs_split_ordered_extent() y la extensión ordenada tiene bytes restantes (lo que significa que tenemos una biografía que no cubre toda la extensión ordenada, vea los detalles en btrfs_extract_ordered_extent()), fallaremos en la siguiente aserción en btrfs_split_ordered_extent(): ASSERT(!(flags &amp; ~BTRFS_ORDERED_TYPE_FLAGS)); porque el indicador BTRFS_ORDERED_IOERR está configurado y la definición de BTRFS_ORDERED_TYPE_FLAGS es solo la unión de todos los indicadores que identifican el tipo de escritura (regular, nocow, prealloc, comprimido, E/S directa, codificado). Solucione esto devolviendo un error de btrfs_extract_ordered_extent() si encontramos el indicador BTRFS_ORDERED_IOERR en la extensión ordenada. El error será el error que resultó en la interrupción de la transacción o -EIO si no ocurrió ninguna interrupción de la transacción. Esto fue informado recientemente por syzbot con el siguiente seguimiento: FAULT_INJECTION: forzando una falla. nombre failslab, intervalo 1, probabilidad 0, espacio 0, multiplicado por 1 CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 No contaminado 6.13.0-rc5-syzkaller #0 Nombre del hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 01/04/2014 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:94 [en línea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 fail_dump lib/fault-inject.c:53 [en línea] should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154 should_failslab+0xac/0x100 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4072 [en línea] slab_alloc_node mm/slub.c:4148 [en línea] __do_kmalloc_node mm/slub.c:4297 [en línea] __kmalloc_noprof+0xdd/0x4c0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [en línea] kzalloc_noprof include/linux/slab.h:1037 [en línea] btrfs_chunk_alloc_add_chunk_item+0x244/0x1100 fs/btrfs/volumes.c:5742 reserve_chunk_space+0x1ca/0x2c0 fs/btrfs/block-group.c:4292 check_system_chunk fs/btrfs/block-group.c:4319 [en línea] do_chunk_alloc fs/btrfs/block-group.c:3891 [en línea] btrfs_chunk_alloc+0x77b/0xf80 fs/btrfs/block-group.c:4187 find_free_extent_update_loop fs/btrfs/extent-tree.c:4166 [en línea] find_free_extent+0x42d1/0x5810 fs/btrfs/extent-tree.c:4579 btrfs_reserve_extent+0x422/0x810 fs/btrfs/extent-tree.c:4672 btrfs_new_extent_direct fs/btrfs/direct-io.c:186 [en línea] btrfs_get_blocks_direct_write+0x706/0xfa0 fs/btrfs/direct-io.c:321 btrfs_dio_iomap_begin+0xbb7/0x1180 fs/btrfs/direct-io.c:525 iomap_iter+0x697/0xf60 fs/iomap/iter.c:90 __iomap_dio_rw+0xeb9/0x25b0 fs/iomap/direct-io.c:702 btrfs_dio_write fs/btrfs/direct-io.c:775 [en línea] btrfs_direct_write+0x610/0xa30 fs/btrfs/direct-io.c:880 btrfs_do_write_iter+0x2a0/0x760 fs/btrfs/file.c:1397 do_iter_readv_writev+0x600/0x880 vfs_writev+0x376/0xba0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [en línea] __do_sys_pwritev2 fs/read_write.c:1204 [en línea] __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195 do_syscall_x64 arch/x86/entry/common.c:52 [en línea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1281f85d29 RSP: 002b:00007f12819fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f1282176080 RCX: 00007f1281f85d29 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 00000000000000005 RBP: 00007f12819fe090 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f1282176080 R15: 00007ffcb9e23328  Error BTRFS (estado A del bucle 0 del dispositivo): transacción abortada (error -12) BTRFS: ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T08:44:11.787",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "620D4308-FEF2-4D7F-84A9-21E66BDB5A28",
              "versionEndExcluding": "6.6.78",
              "versionStartIncluding": "6.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "033BB7EE-C9A2-45EA-BAC9-87BB9D951BCD",
              "versionEndExcluding": "6.12.14",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0E92CEE3-1FC3-4AFC-A513-DEDBA7414F00",
              "versionEndExcluding": "6.13.3",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}