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CVE-2025-71072 (GCVE-0-2025-71072)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:31 – Updated: 2026-08-05 12:11
VLAI
Title
shmem: fix recovery on rename failures
Summary
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
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113 (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4642686699a46718d7f2fb5acd1e9d866a9d9cca (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < e1b4c6a58304fd490124cc2b454d80edc786665c (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:N - A remote NFS client can invoke ordinary RENAME on a writable tmpfs export through nfsd, reaching shmem_rename2() and the vulnerable offset helpers.\nAC:L - The failure requires severe memory pressure, but an attacker with write access to tmpfs can create files and consume memory while repeatedly attempting renames.\nPR:N - A reasonably configured anonymous writable NFS export can accept AUTH_NULL or mapped AUTH_SYS clients without prior authentication, subject only to directory write and search permissions.\nUI:N - The attacker directly sends rename operations and does not require a victim to perform any action.\nS:U - The corrupted directory state and resulting denial of service remain within the host kernel and filesystem security authority.\nC:N - The failure loses directory-offset mappings but creates no stale freed-object access, out-of-bounds read, or other information-disclosure primitive.\nI:L - A failed insertion can persistently desynchronize a live dentry from its maple-tree mapping, corrupting directory metadata and cookies, but it does not provide arbitrary data modification.\nA:H - The corrupted offsets can make local getdents or NFS READDIR repeat, omit, or fail to progress through entries, potentially rendering the exported directory unavailable to clients."
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Lo mismo ocurre con simple_offset_rename_exchange().\\n\\nAdem\u00e1s, shmem_whiteout() espera que, si tiene \u00e9xito, el llamador avance a d_move(), es decir, que shmem_rename2() no falle despu\u00e9s de la llamada exitosa de shmem_whiteout().\\n\\nNo es dif\u00edcil de arreglar, afortunadamente: mtree_store() no puede fallar si el \u00edndice en el que estamos intentando almacenar ya est\u00e1 presente en el \u00e1rbol 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 soluci\u00f3n es preinsertar el objetivo en el \u00e1rbol para new_dir; el resto se puede hacer sin ninguna operaci\u00f3n que pueda fallar.\\n\\nEsa preinserci\u00f3n tiene que hacerse en shmem_rename2() en lugar de en simple_offset_rename() mismo; de lo contrario, necesitar\u00edamos lidiar con la posibilidad de fallo despu\u00e9s de un shmem_whiteout() 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    "redhat_vex": {
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      "cve": "CVE-2025-71072",
      "id": "CVE-2025-71072",
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      "title": "kernel: shmem: fix recovery on rename failures",
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      "cve": "CVE-2025-71072",
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      "initial_release_date": "2026-01-14T00:25:57Z",
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      "product_status:recommended": "42",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-71072",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-71072.json",
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}



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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

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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.