CVE-2026-53154 (GCVE-0-2026-53154)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38
VLAI
Title
mm/hugetlb: restore reservation on error in hugetlb folio copy paths
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: restore reservation on error in hugetlb folio copy paths Two sites in mm/hugetlb.c allocate a hugetlb folio via alloc_hugetlb_folio() (consuming a VMA reservation) and then call copy_user_large_folio(), which became int-returning in commit 1cb9dc4b475c ("mm: hwpoison: support recovery from HugePage copy-on-write faults") and can now fail (e.g. -EHWPOISON on a hwpoisoned source page). On the failure path, folio_put() restores the global hugetlb pool count through free_huge_folio(), but the per-VMA reservation map entry is left marked consumed: - hugetlb_mfill_atomic_pte() resubmission path (UFFDIO_COPY) - copy_hugetlb_page_range() fork-time CoW path when hugetlb_try_dup_anon_rmap() fails (rare: pinned hugetlb anon folio under fork) User-visible effect: on UFFDIO_COPY into a private hugetlb VMA where the resubmission copy fails, the reservation for that address is leaked from the VMA's reserve map. A subsequent fault at the same address takes the no-reservation path, and under hugetlb pool pressure the task is SIGBUSed at an address it had previously reserved. The fork-time CoW path leaks the same way in the child VMA's reserve map, though it requires the much rarer combination of pinned hugetlb anon page + hwpoisoned source. Add the missing restore_reserve_on_error() call before folio_put() on both error paths.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1cb9dc4b475c7418f925ab0c97b6750007d9f52e , < 8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38 (git)
Affected: 1cb9dc4b475c7418f925ab0c97b6750007d9f52e , < e47bf16af3c45470ea32f2241fa69aefe0dd61bd (git)
Affected: 1cb9dc4b475c7418f925ab0c97b6750007d9f52e , < c72469ac0f274bde3f0df60a4584e14a123d0aa6 (git)
Affected: 1cb9dc4b475c7418f925ab0c97b6750007d9f52e , < 45e33d43243d71d089af42f5077b8213cee6610f (git)
Affected: 1cb9dc4b475c7418f925ab0c97b6750007d9f52e , < 40c81856e622a9dc59294a90d169ac07ea25b0b0 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (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)
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On the\\nfailure path, folio_put() restores the global hugetlb pool count through\\nfree_huge_folio(), but the per-VMA reservation map entry is left marked\\nconsumed:\\n\\n  - hugetlb_mfill_atomic_pte() resubmission path (UFFDIO_COPY)\\n  - copy_hugetlb_page_range() fork-time CoW path when\\n    hugetlb_try_dup_anon_rmap() fails (rare: pinned hugetlb anon\\n    folio under fork)\\n\\nUser-visible effect: on UFFDIO_COPY into a private hugetlb VMA where the\\nresubmission copy fails, the reservation for that address is leaked from\\nthe VMA\u0027s reserve map.  A subsequent fault at the same address takes the\\nno-reservation path, and under hugetlb pool pressure the task is SIGBUSed\\nat an address it had previously reserved.  The fork-time CoW path leaks\\nthe same way in the child VMA\u0027s reserve map, though it requires the much\\nrarer combination of pinned hugetlb anon page + hwpoisoned source.\\n\\nAdd the missing restore_reserve_on_error() call before folio_put() on both\\nerror 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-07T20:35:46+00:00",
      "cve": "CVE-2026-53154",
      "id": "CVE-2026-53154",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/hugetlb: restore reservation on error in hugetlb folio copy paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53154.json",
      "version": "3"
    }
  }
}



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