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CVE-2023-52935 (GCVE-0-2023-52935)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:37 – Updated: 2026-08-05 09:12
VLAI
Title
mm/khugepaged: fix ->anon_vma race
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: fix ->anon_vma race If an ->anon_vma is attached to the VMA, collapse_and_free_pmd() requires it to be locked. Page table traversal is allowed under any one of the mmap lock, the anon_vma lock (if the VMA is associated with an anon_vma), and the mapping lock (if the VMA is associated with a mapping); and so to be able to remove page tables, we must hold all three of them. retract_page_tables() bails out if an ->anon_vma is attached, but does this check before holding the mmap lock (as the comment above the check explains). If we racily merged an existing ->anon_vma (shared with a child process) from a neighboring VMA, subsequent rmap traversals on pages belonging to the child will be able to see the page tables that we are concurrently removing while assuming that nothing else can access them. Repeat the ->anon_vma check once we hold the mmap lock to ensure that there really is no concurrent page table access. Hitting this bug causes a lockdep warning in collapse_and_free_pmd(), in the line "lockdep_assert_held_write(&vma->anon_vma->root->rwsem)". It can also lead to use-after-free access.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-28 15:22 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 , < 352fbf61ce776fef18dca6a68680a6cd943dac95 (git)
Affected: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 , < cee956ab1efbd858b4ca61c8b474af5aa24b29a6 (git)
Affected: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 , < abdf3c33918185c3e8ffeb09ed3e334b3d7df47c (git)
Affected: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 , < acb08187b5a83cdb9ac4112fae9e18cf983b0128 (git)
Affected: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 , < 023f47a8250c6bdb4aebe744db4bf7f73414028b (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.4.299 , ≤ 5.4.* (semver)
Unaffected: 5.10.243 , ≤ 5.10.* (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.11 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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Si se adjunta un -\u0026gt;anon_vma al VMA, la funci\u00f3n collapse_and_free_pmd() requiere que est\u00e9 bloqueada. Se permite el recorrido de la tabla de p\u00e1ginas bajo cualquiera de los bloqueos mmap, anon_vma (si el VMA est\u00e1 asociado a un anon_vma) y mapeo (si el VMA est\u00e1 asociado a un mapeo). Por lo tanto, para poder eliminar tablas de p\u00e1ginas, debemos mantener las tres. La funci\u00f3n retract_page_tables() se activa si se adjunta un -\u0026gt;anon_vma, pero realiza esta comprobaci\u00f3n antes de mantener el bloqueo mmap (como explica el comentario sobre la comprobaci\u00f3n). Si fusionamos r\u00e1pidamente un -\u0026gt;anon_vma existente (compartido con un proceso hijo) de un VMA vecino, los recorridos posteriores de rmap en p\u00e1ginas pertenecientes al hijo podr\u00e1n ver las tablas de p\u00e1ginas que estamos eliminando simult\u00e1neamente, asumiendo que nadie m\u00e1s puede acceder a ellas. 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Tambi\u00e9n puede provocar accesos de 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T23:13:20+00:00",
      "cve": "CVE-2023-52935",
      "id": "CVE-2023-52935",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "126",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/khugepaged: fix -\u003eanon_vma race",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52935.json",
      "version": "3"
    },
    "vulnrichment": {
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and so to be\\nable to remove page tables, we must hold all three of them. \\nretract_page_tables() bails out if an -\u003eanon_vma is attached, but does\\nthis check before holding the mmap lock (as the comment above the check\\nexplains).\\n\\nIf we racily merged an existing -\u003eanon_vma (shared with a child\\nprocess) from a neighboring VMA, subsequent rmap traversals on pages\\nbelonging to the child will be able to see the page tables that we are\\nconcurrently removing while assuming that nothing else can access them.\\n\\nRepeat the -\u003eanon_vma check once we hold the mmap lock to ensure that\\nthere really is no concurrent page table access.\\n\\nHitting this bug causes a lockdep warning in collapse_and_free_pmd(),\\nin the line \\\"lockdep_assert_held_write(\u0026vma-\u003eanon_vma-\u003eroot-\u003erwsem)\\\". \\nIt can also lead to use-after-free access.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.299\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.243\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.192\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.11\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-09T17:05:44.962Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52935\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T17:31:05.059Z\", \"dateReserved\": \"2024-08-21T06:07:11.020Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T16:37:15.505Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


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.