CVE-2026-46251

Estado: AnalizadaAlta (8.4)—

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix block_group_tree dirty_list corruption

When the incompat flag EXTENT_TREE_V2 is set, we unconditionally add the block group tree to the switch_commits list before calling switch_commit_roots, as we do for the tree root and the chunk root. However, the block group tree uses normal root dirty tracking and in any transaction that does an allocation and dirties a block group, the block group root will already be linked to a list by the dirty_list field and this use of list_add_tail() is invalid and corrupts the prev/next members of block_group_root->dirty_list.

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This is apparent on a subsequent list_del on the prev if we enable CONFIG_DEBUG_LIST:

Furthermore, this list corruption eventually (when we happen to add a new block group) results in getting the switch_commits and dirty_cowonly_roots lists mixed up and attempting to call update_root on the tree root which can't be found in the tree root, resulting in a transaction abort:

Detalles técnicos trazas, registros y código del informe original

  [32.1571] ------------[ cut here ]------------
  [32.1572] list_del corruption. next->prev should beffff958890202538, but was ffff9588992bd538. (next=ffff958890201538)
  [32.1575] WARNING: lib/list_debug.c:65 at 0x0, CPU#3: sync/607
  [32.1583] CPU: 3 UID: 0 PID: 607 Comm: sync Not tainted 6.18.0 #24PREEMPT(none)
  [32.1585] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS1.17.0-4.fc41 04/01/2014
  [32.1587] RIP: 0010:__list_del_entry_valid_or_report+0x108/0x120
  [32.1593] RSP: 0018:ffffaa288287fdd0 EFLAGS: 00010202
  [32.1594] RAX: 0000000000000001 RBX: ffff95889326e800 RCX:ffff958890201538
  [32.1596] RDX: ffff9588992bd538 RSI: ffff958890202538 RDI:ffffffff82a41e00
  [32.1597] RBP: ffff958890202538 R08: ffffffff828fc1e8 R09:00000000ffffefff
  [32.1599] R10: ffffffff8288c200 R11: ffffffff828e4200 R12:ffff958890201538
  [32.1601] R13: ffff95889326e958 R14: ffff958895c24000 R15:ffff958890202538
  [32.1603] FS:  00007f0c28eb5740(0000) GS:ffff958af2bd2000(0000)knlGS:0000000000000000
  [32.1605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [32.1607] CR2: 00007f0c28e8a3cc CR3: 0000000109942005 CR4:0000000000370ef0
  [32.1609] Call Trace:
  [32.1610]  <TASK>
  [32.1611]  switch_commit_roots+0x82/0x1d0 [btrfs]
  [32.1615]  btrfs_commit_transaction+0x968/0x1550 [btrfs]
  [32.1618]  ? btrfs_attach_transaction_barrier+0x23/0x60 [btrfs]
  [32.1621]  __iterate_supers+0xe8/0x190
  [32.1622]  ? __pfx_sync_fs_one_sb+0x10/0x10
  [32.1623]  ksys_sync+0x63/0xb0
  [32.1624]  __do_sys_sync+0xe/0x20
  [32.1625]  do_syscall_64+0x73/0x450
  [32.1626]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
  [32.1627] RIP: 0033:0x7f0c28d05d2b
  [32.1632] RSP: 002b:00007ffc9d988048 EFLAGS: 00000246 ORIG_RAX:00000000000000a2
  [32.1634] RAX: ffffffffffffffda RBX: 00007ffc9d988228 RCX:00007f0c28d05d2b
  [32.1636] RDX: 00007f0c28e02301 RSI: 00007ffc9d989b21 RDI:00007f0c28dba90d
  [32.1637] RBP: 0000000000000001 R08: 0000000000000001 R09:0000000000000000
  [32.1639] R10: 0000000000000000 R11: 0000000000000246 R12:000055b96572cb80
  [32.1641] R13: 000055b96572b19f R14: 00007f0c28dfa434 R15:000055b96572b034
  [32.1643]  </TASK>
  [32.1644] irq event stamp: 0
  [32.1644] hardirqs last  enabled at (0): [<0000000000000000>] 0x0
  [32.1646] hardirqs last disabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260
  [32.1648] softirqs last  enabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260
  [32.1650] softirqs last disabled at (0): [<0000000000000000>] 0x0
  [32.1652] ---[ end trace 0000000000000000 ]---

  [87.8269] BTRFS critical (device nvme1n1): unable to find root key (1 0 0) in tree 1
  [87.8272] ------------[ cut here ]------------
  [87.8274] BTRFS: Transaction aborted (error -117)
  [87.8275] WARNING: fs/btrfs/root-tree.c:153 at 0x0, CPU#4: sync/703
  [87.8285] CPU: 4 UID: 0 PID: 703 Comm: sync Not tainted 6.18.0 #25 PREEMPT(none)
  [87.8287] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-4.fc41 0
---truncated---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.4

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.20%
Percentil entre todas las CVEs puntuadas: 8
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact65 %

Vulnerabilidad local en kernel Linux (AV:L/PR:N/UI:N) sin interacción del usuario que corrompe estructuras de datos internas del filesystem btrfs, permitiendo DoS por corrupción de listas y aborto de transacciones. Sin elevación de privilegios explícita pero acceso local sin restricciones.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Filter Network Traffic Execution Prevention Encrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

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  "id": "CVE-2026-46251",
  "cveTags": [],
  "metrics": {
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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              "version": "6.12.75",
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              "versionType": "semver",
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            {
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  "published": "2026-06-03T18:16:25.603",
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      "tags": [
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      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix block_group_tree dirty_list corruption\n\nWhen the incompat flag EXTENT_TREE_V2 is set, we unconditionally add the\nblock group tree to the switch_commits list before calling\nswitch_commit_roots, as we do for the tree root and the chunk root.\nHowever, the block group tree uses normal root dirty tracking and in any\ntransaction that does an allocation and dirties a block group, the block\ngroup root will already be linked to a list by the dirty_list field and\nthis use of list_add_tail() is invalid and corrupts the prev/next\nmembers of block_group_root->dirty_list.\n\nThis is apparent on a subsequent list_del on the prev if we enable\nCONFIG_DEBUG_LIST:\n\n  [32.1571] ------------[ cut here ]------------\n  [32.1572] list_del corruption. next->prev should beffff958890202538, but was ffff9588992bd538. (next=ffff958890201538)\n  [32.1575] WARNING: lib/list_debug.c:65 at 0x0, CPU#3: sync/607\n  [32.1583] CPU: 3 UID: 0 PID: 607 Comm: sync Not tainted 6.18.0 #24PREEMPT(none)\n  [32.1585] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS1.17.0-4.fc41 04/01/2014\n  [32.1587] RIP: 0010:__list_del_entry_valid_or_report+0x108/0x120\n  [32.1593] RSP: 0018:ffffaa288287fdd0 EFLAGS: 00010202\n  [32.1594] RAX: 0000000000000001 RBX: ffff95889326e800 RCX:ffff958890201538\n  [32.1596] RDX: ffff9588992bd538 RSI: ffff958890202538 RDI:ffffffff82a41e00\n  [32.1597] RBP: ffff958890202538 R08: ffffffff828fc1e8 R09:00000000ffffefff\n  [32.1599] R10: ffffffff8288c200 R11: ffffffff828e4200 R12:ffff958890201538\n  [32.1601] R13: ffff95889326e958 R14: ffff958895c24000 R15:ffff958890202538\n  [32.1603] FS:  00007f0c28eb5740(0000) GS:ffff958af2bd2000(0000)knlGS:0000000000000000\n  [32.1605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  [32.1607] CR2: 00007f0c28e8a3cc CR3: 0000000109942005 CR4:0000000000370ef0\n  [32.1609] Call Trace:\n  [32.1610]  <TASK>\n  [32.1611]  switch_commit_roots+0x82/0x1d0 [btrfs]\n  [32.1615]  btrfs_commit_transaction+0x968/0x1550 [btrfs]\n  [32.1618]  ? btrfs_attach_transaction_barrier+0x23/0x60 [btrfs]\n  [32.1621]  __iterate_supers+0xe8/0x190\n  [32.1622]  ? __pfx_sync_fs_one_sb+0x10/0x10\n  [32.1623]  ksys_sync+0x63/0xb0\n  [32.1624]  __do_sys_sync+0xe/0x20\n  [32.1625]  do_syscall_64+0x73/0x450\n  [32.1626]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [32.1627] RIP: 0033:0x7f0c28d05d2b\n  [32.1632] RSP: 002b:00007ffc9d988048 EFLAGS: 00000246 ORIG_RAX:00000000000000a2\n  [32.1634] RAX: ffffffffffffffda RBX: 00007ffc9d988228 RCX:00007f0c28d05d2b\n  [32.1636] RDX: 00007f0c28e02301 RSI: 00007ffc9d989b21 RDI:00007f0c28dba90d\n  [32.1637] RBP: 0000000000000001 R08: 0000000000000001 R09:0000000000000000\n  [32.1639] R10: 0000000000000000 R11: 0000000000000246 R12:000055b96572cb80\n  [32.1641] R13: 000055b96572b19f R14: 00007f0c28dfa434 R15:000055b96572b034\n  [32.1643]  </TASK>\n  [32.1644] irq event stamp: 0\n  [32.1644] hardirqs last  enabled at (0): [<0000000000000000>] 0x0\n  [32.1646] hardirqs last disabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260\n  [32.1648] softirqs last  enabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260\n  [32.1650] softirqs last disabled at (0): [<0000000000000000>] 0x0\n  [32.1652] ---[ end trace 0000000000000000 ]---\n\nFurthermore, this list corruption eventually (when we happen to add a\nnew block group) results in getting the switch_commits and\ndirty_cowonly_roots lists mixed up and attempting to call update_root\non the tree root which can't be found in the tree root, resulting in a\ntransaction abort:\n\n  [87.8269] BTRFS critical (device nvme1n1): unable to find root key (1 0 0) in tree 1\n  [87.8272] ------------[ cut here ]------------\n  [87.8274] BTRFS: Transaction aborted (error -117)\n  [87.8275] WARNING: fs/btrfs/root-tree.c:153 at 0x0, CPU#4: sync/703\n  [87.8285] CPU: 4 UID: 0 PID: 703 Comm: sync Not tainted 6.18.0 #25 PREEMPT(none)\n  [87.8287] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-4.fc41 0\n---truncated---"
    }
  ],
  "lastModified": "2026-06-17T10:53:24.967",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2B225BF5-A395-474D-B3BC-E33E67B2BCEE",
              "versionEndExcluding": "6.1.165",
              "versionStartIncluding": "6.0.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2",
              "versionEndExcluding": "6.6.128",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2",
              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7",
              "versionEndExcluding": "6.18.14",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092",
              "versionEndExcluding": "6.19.4",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}