CVE-2025-37999 (GCVE-0-2025-37999)
Vulnerability from cvelistv5
Published
2025-05-29 13:15
Modified
2025-05-29 13:15
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
fs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()
If bio_add_folio() fails (because it is full),
erofs_fileio_scan_folio() needs to submit the I/O request via
erofs_fileio_rq_submit() and allocate a new I/O request with an empty
`struct bio`. Then it retries the bio_add_folio() call.
However, at this point, erofs_onlinefolio_split() has already been
called which increments `folio->private`; the retry will call
erofs_onlinefolio_split() again, but there will never be a matching
erofs_onlinefolio_end() call. This leaves the folio locked forever
and all waiters will be stuck in folio_wait_bit_common().
This bug has been added by commit ce63cb62d794 ("erofs: support
unencoded inodes for fileio"), but was practically unreachable because
there was room for 256 folios in the `struct bio` - until commit
9f74ae8c9ac9 ("erofs: shorten bvecs[] for file-backed mounts") which
reduced the array capacity to 16 folios.
It was now trivial to trigger the bug by manually invoking readahead
from userspace, e.g.:
posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED);
This should be fixed by invoking erofs_onlinefolio_split() only after
bio_add_folio() has succeeded. This is safe: asynchronous completions
invoking erofs_onlinefolio_end() will not unlock the folio because
erofs_fileio_scan_folio() is still holding a reference to be released
by erofs_onlinefolio_end() at the end.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"fs/erofs/fileio.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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},
{
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}
]
},
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],
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"vendor": "Linux",
"versions": [
{
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{
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"version": "6.14.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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"negate": false,
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()\n\nIf bio_add_folio() fails (because it is full),\nerofs_fileio_scan_folio() needs to submit the I/O request via\nerofs_fileio_rq_submit() and allocate a new I/O request with an empty\n`struct bio`. Then it retries the bio_add_folio() call.\n\nHowever, at this point, erofs_onlinefolio_split() has already been\ncalled which increments `folio-\u003eprivate`; the retry will call\nerofs_onlinefolio_split() again, but there will never be a matching\nerofs_onlinefolio_end() call. This leaves the folio locked forever\nand all waiters will be stuck in folio_wait_bit_common().\n\nThis bug has been added by commit ce63cb62d794 (\"erofs: support\nunencoded inodes for fileio\"), but was practically unreachable because\nthere was room for 256 folios in the `struct bio` - until commit\n9f74ae8c9ac9 (\"erofs: shorten bvecs[] for file-backed mounts\") which\nreduced the array capacity to 16 folios.\n\nIt was now trivial to trigger the bug by manually invoking readahead\nfrom userspace, e.g.:\n\n posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED);\n\nThis should be fixed by invoking erofs_onlinefolio_split() only after\nbio_add_folio() has succeeded. This is safe: asynchronous completions\ninvoking erofs_onlinefolio_end() will not unlock the folio because\nerofs_fileio_scan_folio() is still holding a reference to be released\nby erofs_onlinefolio_end() at the end."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-29T13:15:56.825Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/61e0fc3312309867e5a3495329dad0286d2a5703"
},
{
"url": "https://git.kernel.org/stable/c/c26076197df348c84cc23e5962d61902e072a0f5"
},
{
"url": "https://git.kernel.org/stable/c/bbfe756dc3062c1e934f06e5ba39c239aa953b92"
}
],
"title": "fs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2025-37999",
"datePublished": "2025-05-29T13:15:56.825Z",
"dateReserved": "2025-04-16T04:51:23.976Z",
"dateUpdated": "2025-05-29T13:15:56.825Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-37999\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-29T14:15:36.597\",\"lastModified\":\"2025-05-29T14:29:50.247\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()\\n\\nIf bio_add_folio() fails (because it is full),\\nerofs_fileio_scan_folio() needs to submit the I/O request via\\nerofs_fileio_rq_submit() and allocate a new I/O request with an empty\\n`struct bio`. Then it retries the bio_add_folio() call.\\n\\nHowever, at this point, erofs_onlinefolio_split() has already been\\ncalled which increments `folio-\u003eprivate`; the retry will call\\nerofs_onlinefolio_split() again, but there will never be a matching\\nerofs_onlinefolio_end() call. This leaves the folio locked forever\\nand all waiters will be stuck in folio_wait_bit_common().\\n\\nThis bug has been added by commit ce63cb62d794 (\\\"erofs: support\\nunencoded inodes for fileio\\\"), but was practically unreachable because\\nthere was room for 256 folios in the `struct bio` - until commit\\n9f74ae8c9ac9 (\\\"erofs: shorten bvecs[] for file-backed mounts\\\") which\\nreduced the array capacity to 16 folios.\\n\\nIt was now trivial to trigger the bug by manually invoking readahead\\nfrom userspace, e.g.:\\n\\n posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED);\\n\\nThis should be fixed by invoking erofs_onlinefolio_split() only after\\nbio_add_folio() has succeeded. This is safe: asynchronous completions\\ninvoking erofs_onlinefolio_end() will not unlock the folio because\\nerofs_fileio_scan_folio() is still holding a reference to be released\\nby erofs_onlinefolio_end() at the end.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/61e0fc3312309867e5a3495329dad0286d2a5703\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbfe756dc3062c1e934f06e5ba39c239aa953b92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c26076197df348c84cc23e5962d61902e072a0f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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