CVE-2025-38059 (GCVE-0-2025-38059)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2025-06-18 09:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: avoid NULL pointer dereference if no valid csum tree [BUG] When trying read-only scrub on a btrfs with rescue=idatacsums mount option, it will crash with the following call trace: BUG: kernel NULL pointer dereference, address: 0000000000000208 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: G O 6.15.0-rc3-custom+ #236 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs] Call Trace: <TASK> scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs] scrub_simple_mirror+0x175/0x290 [btrfs] scrub_stripe+0x5f7/0x6f0 [btrfs] scrub_chunk+0x9a/0x150 [btrfs] scrub_enumerate_chunks+0x333/0x660 [btrfs] btrfs_scrub_dev+0x23e/0x600 [btrfs] btrfs_ioctl+0x1dcf/0x2f80 [btrfs] __x64_sys_ioctl+0x97/0xc0 do_syscall_64+0x4f/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e [CAUSE] Mount option "rescue=idatacsums" will completely skip loading the csum tree, so that any data read will not find any data csum thus we will ignore data checksum verification. Normally call sites utilizing csum tree will check the fs state flag NO_DATA_CSUMS bit, but unfortunately scrub does not check that bit at all. This results in scrub to call btrfs_search_slot() on a NULL pointer and triggered above crash. [FIX] Check both extent and csum tree root before doing any tree search.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/scrub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "50d0de59f66cbe6d597481e099bf1c70fd07e0a9",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "6e9770de024964b1017f99ee94f71967bd6edaeb",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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            {
              "lessThan": "d35bed14b0bc95c6845863a3744ecd10b888c830",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/scrub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.31",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.93",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: avoid NULL pointer dereference if no valid csum tree\n\n[BUG]\nWhen trying read-only scrub on a btrfs with rescue=idatacsums mount\noption, it will crash with the following call trace:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000208\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: G           O        6.15.0-rc3-custom+ #236 PREEMPT(full)\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n  RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs]\n  Call Trace:\n   \u003cTASK\u003e\n   scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs]\n   scrub_simple_mirror+0x175/0x290 [btrfs]\n   scrub_stripe+0x5f7/0x6f0 [btrfs]\n   scrub_chunk+0x9a/0x150 [btrfs]\n   scrub_enumerate_chunks+0x333/0x660 [btrfs]\n   btrfs_scrub_dev+0x23e/0x600 [btrfs]\n   btrfs_ioctl+0x1dcf/0x2f80 [btrfs]\n   __x64_sys_ioctl+0x97/0xc0\n   do_syscall_64+0x4f/0x120\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n[CAUSE]\nMount option \"rescue=idatacsums\" will completely skip loading the csum\ntree, so that any data read will not find any data csum thus we will\nignore data checksum verification.\n\nNormally call sites utilizing csum tree will check the fs state flag\nNO_DATA_CSUMS bit, but unfortunately scrub does not check that bit at all.\n\nThis results in scrub to call btrfs_search_slot() on a NULL pointer\nand triggered above crash.\n\n[FIX]\nCheck both extent and csum tree root before doing any tree search."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:33:38.943Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50d0de59f66cbe6d597481e099bf1c70fd07e0a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e9770de024964b1017f99ee94f71967bd6edaeb"
        },
        {
          "url": "https://git.kernel.org/stable/c/d35bed14b0bc95c6845863a3744ecd10b888c830"
        },
        {
          "url": "https://git.kernel.org/stable/c/f95d186255b319c48a365d47b69bd997fecb674e"
        }
      ],
      "title": "btrfs: avoid NULL pointer dereference if no valid csum tree",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38059",
    "datePublished": "2025-06-18T09:33:38.943Z",
    "dateReserved": "2025-04-16T04:51:23.979Z",
    "dateUpdated": "2025-06-18T09:33:38.943Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38059\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:38.703\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: avoid NULL pointer dereference if no valid csum tree\\n\\n[BUG]\\nWhen trying read-only scrub on a btrfs with rescue=idatacsums mount\\noption, it will crash with the following call trace:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000208\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: G           O        6.15.0-rc3-custom+ #236 PREEMPT(full)\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\\n  RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs]\\n   scrub_simple_mirror+0x175/0x290 [btrfs]\\n   scrub_stripe+0x5f7/0x6f0 [btrfs]\\n   scrub_chunk+0x9a/0x150 [btrfs]\\n   scrub_enumerate_chunks+0x333/0x660 [btrfs]\\n   btrfs_scrub_dev+0x23e/0x600 [btrfs]\\n   btrfs_ioctl+0x1dcf/0x2f80 [btrfs]\\n   __x64_sys_ioctl+0x97/0xc0\\n   do_syscall_64+0x4f/0x120\\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n[CAUSE]\\nMount option \\\"rescue=idatacsums\\\" will completely skip loading the csum\\ntree, so that any data read will not find any data csum thus we will\\nignore data checksum verification.\\n\\nNormally call sites utilizing csum tree will check the fs state flag\\nNO_DATA_CSUMS bit, but unfortunately scrub does not check that bit at all.\\n\\nThis results in scrub to call btrfs_search_slot() on a NULL pointer\\nand triggered above crash.\\n\\n[FIX]\\nCheck both extent and csum tree root before doing any tree search.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: evitar la desreferencia de puntero NULL si no hay un \u00e1rbol csum v\u00e1lido [ERROR] Al intentar una limpieza de solo lectura en un btrfs con la opci\u00f3n de montaje rescue=idatacsums, se bloquear\u00e1 con el siguiente seguimiento de llamada: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000208 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: GO 6.15.0-rc3-custom+ #236 PREEMPT(full) Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS desconocido 02/02/2022 RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs] Seguimiento de llamadas:  scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs] scrub_simple_mirror+0x175/0x290 [btrfs] scrub_stripe+0x5f7/0x6f0 [btrfs] scrub_chunk+0x9a/0x150 [btrfs] scrub_enumerate_chunks+0x333/0x660 [btrfs] btrfs_scrub_dev+0x23e/0x600 [btrfs] btrfs_ioctl+0x1dcf/0x2f80 [btrfs] __x64_sys_ioctl+0x97/0xc0 do_syscall_64+0x4f/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e [CAUSE] La opci\u00f3n de montaje \\\"rescue=idatacsums\\\" omitir\u00e1 por completo la carga del \u00e1rbol de sumas de comprobaci\u00f3n (CSUM), por lo que los datos le\u00eddos no encontrar\u00e1n ninguna CSU, por lo que se ignorar\u00e1 la verificaci\u00f3n de la suma de comprobaci\u00f3n de datos. Normalmente, los sitios de llamada que utilizan el \u00e1rbol de CSU comprueban el bit NO_DATA_CSUMS del indicador de estado del sistema de archivos, pero lamentablemente, scrub no lo comprueba en absoluto. Esto provoca que scrub llame a btrfs_search_slot() en un puntero nulo, lo que provoc\u00f3 el bloqueo mencionado anteriormente. [CORRECCI\u00d3N] Compruebe la extensi\u00f3n y la ra\u00edz del \u00e1rbol de CSU antes de realizar cualquier b\u00fasqueda en el \u00e1rbol.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/50d0de59f66cbe6d597481e099bf1c70fd07e0a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e9770de024964b1017f99ee94f71967bd6edaeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d35bed14b0bc95c6845863a3744ecd10b888c830\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f95d186255b319c48a365d47b69bd997fecb674e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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