Vulnerability-Lookup

FKIE_CVE-2025-71072

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-07-30 06:24

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4642686699a46718d7f2fb5acd1e9d866a9d9cca	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.6
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/libfs.c",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
            {
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            },
            {
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              "status": "unaffected",
              "version": "6.12.64",
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            },
            {
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              "status": "unaffected",
              "version": "6.18.3",
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            },
            {
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  "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\u0027t fail past the\nsuccessful call of shmem_whiteout().\n\nNot hard to fix, fortunately - mtree_store() can\u0027t 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\u0027s 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\u0027d 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 recuperaci\u00f3n 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\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() exitoso."
    }
  ],
  "id": "CVE-2025-71072",
  "lastModified": "2026-07-30T06:24:48.857",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
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        "type": "Secondary"
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          "baseScore": 5.5,
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  "published": "2026-01-13T16:16:06.633",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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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

Title

shmem: fix recovery on rename failures

Summary

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/4b0fe71fb3965d0db…
https://git.kernel.org/stable/c/4642686699a46718d…
https://git.kernel.org/stable/c/e1b4c6a58304fd490…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113 (git) Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4642686699a46718d7f2fb5acd1e9d866a9d9cca (git) Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < e1b4c6a58304fd490124cc2b454d80edc786665c (git)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/libfs.c",
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              "lang": "en",
              "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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    "cveId": "CVE-2025-71072",
    "datePublished": "2026-01-13T15:31:26.089Z",
    "dateReserved": "2026-01-13T15:30:19.647Z",
    "dateUpdated": "2026-08-05T12:11:52.290Z",
    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.