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

Vulnerability from cvelistv5 – Published: 2026-01-13 15:31 – Updated: 2026-02-09 08:34
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113 (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4642686699a46718d7f2fb5acd1e9d866a9d9cca (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < e1b4c6a58304fd490124cc2b454d80edc786665c (git)
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    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)
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{
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          "programFiles": [
            "fs/libfs.c",
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              "operator": "OR"
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      "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()."
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      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:34:22.909Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c"
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      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71072",
    "datePublished": "2026-01-13T15:31:26.089Z",
    "dateReserved": "2026-01-13T15:30:19.647Z",
    "dateUpdated": "2026-02-09T08:34:22.909Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71072\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:06.633\",\"lastModified\":\"2026-01-14T16:26:00.933\",\"vulnStatus\":\"Awaiting Analysis\",\"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().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4642686699a46718d7f2fb5acd1e9d866a9d9cca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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