CVE-2026-53189 (GCVE-0-2026-53189)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:33
VLAI
Title
mm/huge_memory: update file PMD counter before folio_put()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: update file PMD counter before folio_put() __split_huge_pmd_locked() updates the file/shmem RSS counter after dropping the PMD mapping's folio reference. If folio_put() drops the last reference, mm_counter_file() can later read freed folio state via folio_test_swapbacked(). Move the counter update before folio_put().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 84b3212b166b446faea27ebebb7161405ffceef9 (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 108963978a681c0c468d279cac2b930c27672877 (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 459771c9cf30f378bdbd30fc65d17f7eb931bb59 (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < ae9d4caf6f133e884cf5fcda4982c493b35e5194 (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 6c29a8ba084e89499ca77b947e07ae817f9c16ce (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 5f5b604e1e6bde4e889199168ee80fe8306d06ad (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < ed5b030931292c94133437ac5e5ff580e498eabd (git)
Affected: fadae2953072e9005c5f1d64e1049edb043494dc , < 8d878059924f12c1bc24556a92ec56add74de3c8 (git)
Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:L - Reachable by a local process through ordinary memory-management paths such as page fault creation of a file/shmem huge PMD followed by mprotect/munmap/mremap-style PMD splitting. No network, adjacent, or physical input path reaches this core MM helper.\nAC:L - An attacker can create suitable file/shmem THP mappings and trigger PMD splits from their own process; any last-reference/race condition can be driven with attacker-controlled local threads and file operations. Under the uncertainty rule, this is Low complexity.\nPR:L - The path requires only an unprivileged local user able to mmap and modify protections or mappings of their own file/tmpfs memory. No real root or init-namespace capability gate is required.\nUI:N - Exploitation does not require another user to take action. The local attacker can set up the mapping and trigger the split themselves.\nS:U - The vulnerable code is in the kernel MM subsystem and impacts kernel-managed resources within the same security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a use-after-free read of folio state after the PMD mapping reference may be dropped. Following kernel UAF guidance and the higher-severity rule, this is treated as potentially enabling high confidentiality impact.\nI:H - The stale freed folio state controls which RSS counter is updated and represents UAF-driven kernel memory/accounting corruption in core MM. Following the UAF guidance and higher-severity rule, integrity impact is High.\nA:H - A UAF in the huge PMD split path can corrupt kernel MM state and can plausibly lead to warnings, oopses, or crashes when repeatedly triggered. Kernel UAF availability impact is therefore High."
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If folio_put() drops the last\\nreference, mm_counter_file() can later read freed folio state via\\nfolio_test_swapbacked().\\n\\nMove the counter update before 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:35:36+00:00",
      "cve": "CVE-2026-53189",
      "id": "CVE-2026-53189",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/huge_memory: update file PMD counter before folio_put()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53189.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:14:13Z",
      "cve": "CVE-2026-53189",
      "id": "CVE-2026-53189",
      "initial_release_date": "2026-06-26T02:10:41Z",
      "product_status:known_affected": "228",
      "product_status:known_not_affected": "67",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53189",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53189.json",
      "version": "5"
    }
  }
}



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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.