CVE-2022-48631 (GCVE-0-2022-48631)

Vulnerability from cvelistv5 – Published: 2024-04-28 12:59 – Updated: 2026-05-11 18:44
VLAI
Title
ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0 When walking through an inode extents, the ext4_ext_binsearch_idx() function assumes that the extent header has been previously validated. However, there are no checks that verify that the number of entries (eh->eh_entries) is non-zero when depth is > 0. And this will lead to problems because the EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this: [ 135.245946] ------------[ cut here ]------------ [ 135.247579] kernel BUG at fs/ext4/extents.c:2258! [ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code: [ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace: [ 135.278635] <TASK> [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [ 135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hwframe+0x46/0xb0 This patch simply adds an extra check in __ext4_ext_check(), verifying that eh_entries is not 0 when eh_depth is > 0.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-28 18:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c29c0ae7f282828da3695167ed870131798348d9 , < bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0 (git)
Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 958b0ee23f5ac106e7cc11472b71aa2ea9a033bc (git)
Affected: c29c0ae7f282828da3695167ed870131798348d9 , < be4df018c0be5ebecf1ca510feacc23be415cefc (git)
Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 2f5e9de15e4f55fbf56f22d4a2ce406246cc462d (git)
Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 5.4.215 , ≤ 5.4.* (semver)
Unaffected: 5.10.146 , ≤ 5.10.* (semver)
Unaffected: 5.15.71 , ≤ 5.15.* (semver)
Unaffected: 5.19.12 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corrige error en el an\u00e1lisis de extensiones cuando eh_entries == 0 y eh_ Depth \u0026gt; 0 Al recorrer las extensiones de un inodo, la funci\u00f3n ext4_ext_binsearch_idx() asume que el encabezado de la extensi\u00f3n ha sido validado previamente. Sin embargo, no hay comprobaciones que verifiquen que el n\u00famero de entradas (eh-\u0026gt;eh_entries) sea distinto de cero cuando la profundidad es \u0026gt; 0. Y esto generar\u00e1 problemas porque EXT_FIRST_INDEX() y EXT_LAST_INDEX() devolver\u00e1n basura y dar\u00e1n como resultado esto: [135.245946] ------------[ cortar aqu\u00ed ]------------ [ 135.247579] \u00a1ERROR del kernel en fs/ext4/extents.c:2258! [ 135.249045] c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] SMP PREEMPT [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 No contaminado 5.19.0-rc8+ #4 [ 135.252067] Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996) , BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 01/04/2014 [135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [135.256475] C\u00f3digo: [135.261433] RSP: ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000000 3 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 00000000000002602 R 11: 0000000000000000 R12: 0000000000000024 [ 135.270477 ] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) ) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3 : 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Seguimiento de llamadas: [ 135.278635]  [ 135.279247] ? preempt_count_add+0x6d/0xa0 [135.280358]? \u00bfpercpu_counter_add_batch+0x55/0xb0 [135.281612]? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [135.284562] ext4_mpage_readpages+0x3d6/0x770 [135.285646] read_pages+0x67/0x1d0 [135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [135.290332] filemap_read+0xbf/0x300 [135.291158]? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] Entry_SYSCALL_64_after_hwframe+0x46/0xb0 Este parche simplemente agrega un verificaci\u00f3n adicional en __ext4_ext_check(), verificando que eh_entries no sea 0 cuando eh_ Depth sea \u0026gt; 0."
          }
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        "id": "CVE-2022-48631",
        "lastModified": "2026-06-17T05:15:46.153",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48631.json",
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                  "versionType": "original_commit_for_fix"
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0."
            }
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            "dateUpdated": "2026-05-11T18:44:06.323Z",
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            },
            {
              "url": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d"
            },
            {
              "url": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0"
            }
          ],
          "title": "ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48631",
        "datePublished": "2024-04-28T12:59:06.569Z",
        "dateReserved": "2024-02-25T13:44:28.315Z",
        "dateUpdated": "2026-05-11T18:44:06.323Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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