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
Linux Linux Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113 (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 4642686699a46718d7f2fb5acd1e9d866a9d9cca (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < e1b4c6a58304fd490124cc2b454d80edc786665c (git)
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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/libfs.c",
            "include/linux/fs.h",
            "mm/shmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113",
              "status": "affected",
              "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
              "versionType": "git"
            },
            {
              "lessThan": "4642686699a46718d7f2fb5acd1e9d866a9d9cca",
              "status": "affected",
              "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
              "versionType": "git"
            },
            {
              "lessThan": "e1b4c6a58304fd490124cc2b454d80edc786665c",
              "status": "affected",
              "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/libfs.c",
            "include/linux/fs.h",
            "mm/shmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:52.290Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113"
        },
        {
          "url": "https://git.kernel.org/stable/c/4642686699a46718d7f2fb5acd1e9d866a9d9cca"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c"
        }
      ],
      "title": "shmem: fix recovery on rename failures",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-71072",
      "date": "2026-08-15",
      "epss": "0.0025",
      "percentile": "0.16637"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:57:44.000Z",
      "cve": "CVE-2025-71072",
      "id": "msrc_CVE-2025-71072",
      "initial_release_date": "2026-01-02T00:00:00.000Z",
      "product_status:known_affected": "11",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "shmem: fix recovery on rename failures",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-71072.json",
      "version": "12"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71072\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:06.633\",\"lastModified\":\"2026-07-30T06:24:48.857\",\"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\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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/libfs.c\",\"include/linux/fs.h\",\"mm/shmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a2e459555c5f9da3e619b7e47a63f98574dc75f1\",\"lessThan\":\"4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a2e459555c5f9da3e619b7e47a63f98574dc75f1\",\"lessThan\":\"4642686699a46718d7f2fb5acd1e9d866a9d9cca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a2e459555c5f9da3e619b7e47a63f98574dc75f1\",\"lessThan\":\"e1b4c6a58304fd490124cc2b454d80edc786665c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/libfs.c\",\"include/linux/fs.h\",\"mm/shmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.64\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.3\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.1\",\"versionEndExcluding\":\"6.12.64\",\"matchCriteriaId\":\"44DC6A0C-1CDA-49FB-A889-9025B3D5827A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.3\",\"matchCriteriaId\":\"2DC484D8-FB4F-4112-900F-AE333B6FE7A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.6:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"E346B162-D566-4E62-ABDE-ECBFB21B8BFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB5B7DFC-C36B-45D8-922C-877569FDDF43\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4642686699a46718d7f2fb5acd1e9d866a9d9cca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-11T15:33:07+00:00",
      "cve": "CVE-2025-71072",
      "id": "CVE-2025-71072",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: shmem: fix recovery on rename failures",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71072.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-13T01:35:50Z",
      "cve": "CVE-2025-71072",
      "id": "CVE-2025-71072",
      "initial_release_date": "2026-01-14T00:25:57Z",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "333",
      "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",
      "version": "12"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.