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 ?
No CVSS data available.
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) |
||
{
"containers": {
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"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"mm/hugetlb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38",
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"version": "1cb9dc4b475c7418f925ab0c97b6750007d9f52e",
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"versionType": "git"
},
{
"lessThan": "45e33d43243d71d089af42f5077b8213cee6610f",
"status": "affected",
"version": "1cb9dc4b475c7418f925ab0c97b6750007d9f52e",
"versionType": "git"
},
{
"lessThan": "40c81856e622a9dc59294a90d169ac07ea25b0b0",
"status": "affected",
"version": "1cb9dc4b475c7418f925ab0c97b6750007d9f52e",
"versionType": "git"
}
]
},
{
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"product": "Linux",
"programFiles": [
"mm/hugetlb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"lessThan": "6.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.143",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.94",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.36",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.13",
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{
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],
"negate": false,
"operator": "OR"
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],
"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\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 paths."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-25T08:38:38.168Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "mm/hugetlb: restore reservation on error in hugetlb folio copy paths",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-53154",
"datePublished": "2026-06-25T08:38:38.168Z",
"dateReserved": "2026-06-09T07:44:35.388Z",
"dateUpdated": "2026-06-25T08:38:38.168Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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