CVE-2025-71072

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: shmem: fix recovery on rename failures maple_tree insertions can fail if we are seriously short on memory; simple_offset_rename() does not recover well if it runs into that. The same goes for simple_offset_rename_exchange(). Moreover, shmem_whiteout() expects that if it succeeds, the caller will progress to d_move(), i.e. that shmem_rename2() won't fail past the successful call of shmem_whiteout(). Not hard to fix, fortunately - mtree_store() can't fail if the index we are trying to store into is already present in the tree as a singleton. For simple_offset_rename_exchange() that's enough - we just need to be careful about the order of operations. For simple_offset_rename() solution is to preinsert the target into the tree for new_dir; the rest can be done without any potentially failing operations. That preinsertion has to be done in shmem_rename2() rather than in simple_offset_rename() itself - otherwise we'd need to deal with the possibility of failure after successful shmem_whiteout().

Severity

MEDIUM

CVSS score

5.5 (v3.1)

Vulnerability status

Modified

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-01-13 16:16:06.633000

Last modified

2026-10-21 13:18:24.783000

View original CVE JSON

{
  "id": "CVE-2025-71072",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-01-13T16:16:06.633",
  "lastModified": "2026-10-21T13:18:24.783",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nshmem: fix recovery on rename failures\n\nmaple_tree insertions can fail if we are seriously short on memory;\nsimple_offset_rename() does not recover well if it runs into that.\nThe same goes for simple_offset_rename_exchange().\n\nMoreover, shmem_whiteout() expects that if it succeeds, the caller will\nprogress to d_move(), i.e. that shmem_rename2() won't fail past the\nsuccessful call of shmem_whiteout().\n\nNot hard to fix, fortunately - mtree_store() can't fail if the index we\nare trying to store into is already present in the tree as a singleton.\n\nFor simple_offset_rename_exchange() that's enough - we just need to be\ncareful about the order of operations.\n\nFor simple_offset_rename() solution is to preinsert the target into the\ntree for new_dir; the rest can be done without any potentially failing\noperations.\n\nThat preinsertion has to be done in shmem_rename2() rather than in\nsimple_offset_rename() itself - otherwise we'd need to deal with the\npossibility of failure after successful shmem_whiteout()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nshmem: corrige la recuperación en fallos de renombrado\n\nLas inserciones de maple_tree pueden fallar si tenemos una escasez grave de memoria; simple_offset_rename() no se recupera bien si se encuentra con eso. Lo mismo ocurre con simple_offset_rename_exchange().\n\nAdemás, shmem_whiteout() espera que, si tiene éxito, el llamador avance a d_move(), es decir, que shmem_rename2() no falle después de la llamada exitosa de shmem_whiteout().\n\nNo es difícil de arreglar, afortunadamente: mtree_store() no puede fallar si el índice en el que estamos intentando almacenar ya está presente en el árbol como un singleton.\n\nPara simple_offset_rename_exchange() eso es suficiente; solo necesitamos tener cuidado con el orden de las operaciones.\n\nPara simple_offset_rename() la solución es preinsertar el objetivo en el árbol para new_dir; el resto se puede hacer sin ninguna operación que pueda fallar.\n\nEsa preinserción tiene que hacerse en shmem_rename2() en lugar de en simple_offset_rename() mismo; de lo contrario, necesitaríamos lidiar con la posibilidad de fallo después de un shmem_whiteout() exitoso."
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