In the Linux kernel, the following vulnerability has been resolved:
fs/buffer: add alert in try_to_free_buffers() for folios without buffers
try_to_free_buffers() can be called on folios with no buffers attached
when filemap_release_folio() is invoked on a folio belonging to a mapping
with AS_RELEASE_ALWAYS set but no release_folio operation defined.
In such cases, folio_needs_release() returns true because of the
AS_RELEASE_ALWAYS flag, but the folio has no private buffer data. This
causes try_to_free_buffers() to call drop_buffers() on a folio with no
buffers, leading to a null pointer dereference.
Adding a check in try_to_free_buffers() to return early if the folio has no
buffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.
This provides defensive hardening.
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-71295",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"dateUpdated": "2026-05-11T21:57:26.207Z",
"dateReserved": "2026-05-06T11:31:45.510Z",
"datePublished": "2026-05-06T11:32:25.917Z",
"state": "PUBLISHED"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T21:57:26.207Z"
},
"title": "fs/buffer: add alert in try_to_free_buffers() for folios without buffers",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: add alert in try_to_free_buffers() for folios without buffers\n\ntry_to_free_buffers() can be called on folios with no buffers attached\nwhen filemap_release_folio() is invoked on a folio belonging to a mapping\nwith AS_RELEASE_ALWAYS set but no release_folio operation defined.\n\nIn such cases, folio_needs_release() returns true because of the\nAS_RELEASE_ALWAYS flag, but the folio has no private buffer data. This\ncauses try_to_free_buffers() to call drop_buffers() on a folio with no\nbuffers, leading to a null pointer dereference.\n\nAdding a check in try_to_free_buffers() to return early if the folio has no\nbuffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.\nThis provides defensive hardening."
}
],
"affected": [
{
"vendor": "Linux",
"product": "Linux",
"programFiles": [
"fs/buffer.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"defaultStatus": "unaffected",
"versions": [
{
"version": "d0eafc763135508be118dac208887a26c0adb74d",
"status": "affected",
"versionType": "git",
"lessThan": "1b111a69a6e33a922622bf9870e4e63fb2b649c8"
},
{
"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
"status": "affected",
"versionType": "git",
"lessThan": "c1b6227555c52781178132b7a06466711855795c"
},
{
"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
"status": "affected",
"versionType": "git",
"lessThan": "727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3"
},
{
"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
"status": "affected",
"versionType": "git",
"lessThan": "42c32d7571ccd8ef32351cac506f00b0fae99fd2"
},
{
"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
"status": "affected",
"versionType": "git",
"lessThan": "c6246ca15999053d2632fbcc7b86e6eef7f077cb"
},
{
"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
"status": "affected",
"versionType": "git",
"lessThan": "b68f91ef3b3fe82ad78c417de71b675699a8467c"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"programFiles": [
"fs/buffer.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"defaultStatus": "affected",
"versions": [
{
"version": "6.6",
"status": "affected"
},
{
"version": "0",
"status": "unaffected",
"versionType": "semver",
"lessThan": "6.6"
},
{
"version": "6.1.165",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"version": "6.6.128",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"version": "6.12.75",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"version": "6.18.16",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"version": "6.19.6",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"version": "7.0",
"status": "unaffected",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8"
},
{
"url": "https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795c"
},
{
"url": "https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3"
},
{
"url": "https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2"
},
{
"url": "https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cb"
},
{
"url": "https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467c"
}
]
}
}
}