CVE-2026-53154None▾ SunlitIn 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 rese…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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:
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.
Linux >= 1cb9dc4b475c7418f925ab0c97b6750007d9f52e < 8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38Linux >= 1cb9dc4b475c7418f925ab0c97b6750007d9f52e < e47bf16af3c45470ea32f2241fa69aefe0dd61bdLinux >= 1cb9dc4b475c7418f925ab0c97b6750007d9f52e < c72469ac0f274bde3f0df60a4584e14a123d0aa6Linux >= 1cb9dc4b475c7418f925ab0c97b6750007d9f52e < 45e33d43243d71d089af42f5077b8213cee6610fLinux >= 1cb9dc4b475c7418f925ab0c97b6750007d9f52e < 40c81856e622a9dc59294a90d169ac07ea25b0b0Linux 6.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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