CVE-2023-52622 (GCVE-0-2023-52622)

Vulnerability from cvelistv5 – Published: 2024-03-26 17:19 – Updated: 2026-05-11 19:30
VLAI?
Title
ext4: avoid online resizing failures due to oversized flex bg
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid online resizing failures due to oversized flex bg When we online resize an ext4 filesystem with a oversized flexbg_size, mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount $dev $dir resize2fs $dev 16G the following WARN_ON is triggered: ================================================================== WARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550 Modules linked in: sg(E) CPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Call Trace: <TASK> __kmalloc_large_node+0xa2/0x200 __kmalloc+0x16e/0x290 ext4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ================================================================== This is because flexbg_size is too large and the size of the new_group_data array to be allocated exceeds MAX_ORDER. Currently, the minimum value of MAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding maximum number of groups that can be allocated is: (PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845 And the value that is down-aligned to the power of 2 is 16384. Therefore, this value is defined as MAX_RESIZE_BG, and the number of groups added each time does not exceed this value during resizing, and is added multiple times to complete the online resizing. The difference is that the metadata in a flex_bg may be more dispersed.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < cd1f93ca97a9136989f3bd2bf90696732a2ed644 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < b183fe8702e78bba3dcef8e7193cab6898abee07 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < cfbbb3199e71b63fc26cee0ebff327c47128a1e8 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < 6d2cbf517dcabc093159cf138ad5712c9c7fa954 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < dc3e0f55bec4410f3d74352c4a7c79f518088ee2 (git)
Affected: 28c7bac0091687e6116ebd6c179e154ae4053c90 , < 5d1935ac02ca5aee364a449a35e2977ea84509b0 (git)
Create a notification for this product.
Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 4.19.307 , ≤ 4.19.* (semver)
Unaffected: 5.4.269 , ≤ 5.4.* (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.77 , ≤ 6.1.* (semver)
Unaffected: 6.6.16 , ≤ 6.6.* (semver)
Unaffected: 6.7.4 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52622\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-26T18:15:08.873\",\"lastModified\":\"2025-03-17T15:19:52.373\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: avoid online resizing failures due to oversized flex bg\\n\\nWhen we online resize an ext4 filesystem with a oversized flexbg_size,\\n\\n     mkfs.ext4 -F -G 67108864 $dev -b 4096 100M\\n     mount $dev $dir\\n     resize2fs $dev 16G\\n\\nthe following WARN_ON is triggered:\\n==================================================================\\nWARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550\\nModules linked in: sg(E)\\nCPU: 0 PID: 427 Comm: resize2fs Tainted: G  E  6.6.0-rc5+ #314\\nRIP: 0010:__alloc_pages+0x411/0x550\\nCall Trace:\\n \u003cTASK\u003e\\n __kmalloc_large_node+0xa2/0x200\\n __kmalloc+0x16e/0x290\\n ext4_resize_fs+0x481/0xd80\\n __ext4_ioctl+0x1616/0x1d90\\n ext4_ioctl+0x12/0x20\\n __x64_sys_ioctl+0xf0/0x150\\n do_syscall_64+0x3b/0x90\\n==================================================================\\n\\nThis is because flexbg_size is too large and the size of the new_group_data\\narray to be allocated exceeds MAX_ORDER. Currently, the minimum value of\\nMAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding\\nmaximum number of groups that can be allocated is:\\n\\n (PAGE_SIZE \u003c\u003c MAX_ORDER) / sizeof(struct ext4_new_group_data) \u2248 21845\\n\\nAnd the value that is down-aligned to the power of 2 is 16384. Therefore,\\nthis value is defined as MAX_RESIZE_BG, and the number of groups added\\neach time does not exceed this value during resizing, and is added multiple\\ntimes to complete the online resizing. The difference is that the metadata\\nin a flex_bg may be more dispersed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: evita fallos de cambio de tama\u00f1o en l\u00ednea debido a flex bg sobredimensionado Cuando redimensionamos en l\u00ednea un sistema de archivos ext4 con un flexbg_size sobredimensionado, mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount $dev $dir resize2fs $dev 16G se activa el siguiente WARN_ON: ===================================== ============================== ADVERTENCIA: CPU: 0 PID: 427 en mm/page_alloc.c:4402 __alloc_pages+0x411/ 0x550 M\u00f3dulos vinculados en: sg(E) CPU: 0 PID: 427 Comm: resize2fs Contaminado: GE 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Seguimiento de llamadas:  __kmalloc_large_node+0xa2/0x200 __kmalloc+ 0x16e/0x290 text4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 text4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ======== =============== ============================================ Esto se debe a que flexbg_size tambi\u00e9n lo es grande y el tama\u00f1o de la matriz new_group_data que se asignar\u00e1 excede MAX_ORDER. Actualmente, el valor m\u00ednimo de MAX_ORDER es 8, el valor m\u00ednimo de PAGE_SIZE es 4096, el n\u00famero m\u00e1ximo correspondiente de grupos que se pueden asignar es: (PAGE_SIZE \u0026lt;\u0026lt; MAX_ORDER) / sizeof(struct text4_new_group_data) ? 21845 Y el valor que est\u00e1 hacia abajo -alineado a la potencia de 2 es 16384. Por lo tanto, este valor se define como MAX_RESIZE_BG, y el n\u00famero de grupos agregados cada vez no excede este valor durante el cambio de tama\u00f1o y se agrega varias veces para completar el cambio de tama\u00f1o en l\u00ednea. La diferencia es que los metadatos en flex_bg pueden estar m\u00e1s 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due to oversized flex bg\\n\\nWhen we online resize an ext4 filesystem with a oversized flexbg_size,\\n\\n     mkfs.ext4 -F -G 67108864 $dev -b 4096 100M\\n     mount $dev $dir\\n     resize2fs $dev 16G\\n\\nthe following WARN_ON is triggered:\\n==================================================================\\nWARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550\\nModules linked in: sg(E)\\nCPU: 0 PID: 427 Comm: resize2fs Tainted: G  E  6.6.0-rc5+ #314\\nRIP: 0010:__alloc_pages+0x411/0x550\\nCall Trace:\\n \u003cTASK\u003e\\n __kmalloc_large_node+0xa2/0x200\\n __kmalloc+0x16e/0x290\\n ext4_resize_fs+0x481/0xd80\\n __ext4_ioctl+0x1616/0x1d90\\n ext4_ioctl+0x12/0x20\\n __x64_sys_ioctl+0xf0/0x150\\n do_syscall_64+0x3b/0x90\\n==================================================================\\n\\nThis is because flexbg_size is too large and the size of the new_group_data\\narray to be allocated exceeds MAX_ORDER. 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      "cveMetadata": "{\"cveId\": \"CVE-2023-52622\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:16:46.434Z\", \"dateReserved\": \"2024-03-06T09:52:12.090Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-26T17:19:23.838Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.