{"id":"CVE-2026-53154","state":"PUBLISHED","title":"mm/hugetlb: restore reservation on error in hugetlb folio copy paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: restore reservation on error in hugetlb folio copy paths\n\nTwo sites in mm/hugetlb.c allocate a hugetlb folio via\nalloc_hugetlb_folio() (consuming a VMA reservation) and then call\ncopy_user_large_folio(), which became int-returning in commit 1cb9dc4b475c\n(\"mm: hwpoison: support recovery from HugePage copy-on-write faults\") and\ncan now fail (e.g.  -EHWPOISON on a hwpoisoned source page).  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's 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's 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 paths.","publishedAt":"2026-06-25T08:38:38.168Z","updatedAt":"2026-06-25T08:38:38.168Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"e47bf16af3c45470ea32f2241fa69aefe0dd61bd","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"c72469ac0f274bde3f0df60a4584e14a123d0aa6","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"45e33d43243d71d089af42f5077b8213cee6610f","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"40c81856e622a9dc59294a90d169ac07ea25b0b0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/hugetlb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/hugetlb.c"]}],"references":["https://git.kernel.org/stable/c/8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38","https://git.kernel.org/stable/c/e47bf16af3c45470ea32f2241fa69aefe0dd61bd","https://git.kernel.org/stable/c/c72469ac0f274bde3f0df60a4584e14a123d0aa6","https://git.kernel.org/stable/c/45e33d43243d71d089af42f5077b8213cee6610f","https://git.kernel.org/stable/c/40c81856e622a9dc59294a90d169ac07ea25b0b0"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53154.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53154","state":"PUBLISHED","datePublished":"2026-06-25T08:38:38.168Z","dateUpdated":"2026-06-25T08:38:38.168Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.388Z"},"containers":{"cna":{"title":"mm/hugetlb: restore reservation on error in hugetlb folio copy paths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: restore reservation on error in hugetlb folio copy paths\n\nTwo sites in mm/hugetlb.c allocate a hugetlb folio via\nalloc_hugetlb_folio() (consuming a VMA reservation) and then call\ncopy_user_large_folio(), which became int-returning in commit 1cb9dc4b475c\n(\"mm: hwpoison: support recovery from HugePage copy-on-write faults\") and\ncan now fail (e.g.  -EHWPOISON on a hwpoisoned source page).  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's 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's 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 paths."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"e47bf16af3c45470ea32f2241fa69aefe0dd61bd","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"c72469ac0f274bde3f0df60a4584e14a123d0aa6","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"45e33d43243d71d089af42f5077b8213cee6610f","versionType":"git"},{"version":"1cb9dc4b475c7418f925ab0c97b6750007d9f52e","status":"affected","lessThan":"40c81856e622a9dc59294a90d169ac07ea25b0b0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/hugetlb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/hugetlb.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38"},{"url":"https://git.kernel.org/stable/c/e47bf16af3c45470ea32f2241fa69aefe0dd61bd"},{"url":"https://git.kernel.org/stable/c/c72469ac0f274bde3f0df60a4584e14a123d0aa6"},{"url":"https://git.kernel.org/stable/c/45e33d43243d71d089af42f5077b8213cee6610f"},{"url":"https://git.kernel.org/stable/c/40c81856e622a9dc59294a90d169ac07ea25b0b0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-25T08:38:38.168Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}