block: don't revert iter for -EIOCBQUEUED
In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustment on whether or not the result is bigger-than-or-equal to zero (where bigger than makes more sense), and not checking the return value of blkdev_direct_IO() before doing an iov_iter_revert(). The latter can lead to attempting to revert with a negative value, which when passed to iov_iter_revert() as an unsigned value will lead to throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT. Be sane and don't revert for -EIOCBQUEUED, like what is done in other spots.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.129, 6.12.14, 6.13.3, 6.6.78
- CVEs
- CVE-2025-21832
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 20:02 UTC · Revision 1
Source evidence
In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustment on whether or not the result is bigger-than-or-equal to zero (where bigger than makes more sense), and not checking the return value of blkdev_direct_IO() before doing an iov_iter_revert(). The latter can lead to attempting to revert with a negative value, which when passed to iov_iter_revert() as an unsigned value will lead to throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT. Be sane and don't revert for -EIOCBQUEUED, like what is done in other spots.
osv:CVE-2025-21832
Kernel
Fixed versions: 6.1.129, 6.6.78, 6.12.14, 6.13.3
Complete source record
{
"id": "53ec5188d5be2139a91d52ee23e2d03c575f87d401264f1cd14138d83396a8e3",
"url": "https://osv.dev/vulnerability/CVE-2025-21832",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "block: don't revert iter for -EIOCBQUEUED",
"summary": "In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustment on whether or not the result is bigger-than-or-equal to zero (where bigger than makes more sense), and not checking the return value of blkdev_direct_IO() before doing an iov_iter_revert(). The latter can lead to attempting to revert with a negative value, which when passed to iov_iter_revert() as an unsigned value will lead to throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT. Be sane and don't revert for -EIOCBQUEUED, like what is done in other spots.",
"evidence": "osv:CVE-2025-21832",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.1.129",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.78",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.14",
"evidence": "/affected/1/ranges"
},
{
"value": "6.13.3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2025-21832",
"aliases": [
"CVE-2025-21832"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3e1f941dd9f33776b3df4e30f741fe445ff773f3"
},
{
"fixed": "6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb"
},
{
"fixed": "84671b0630ccb46ae9f1f99a45c7d63ffcd6a474"
},
{
"fixed": "68f16d3034a06661245ecd22f0d586a8b4e7c473"
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{
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{
"fixed": "b13ee668e8280ca5b07f8ce2846b9957a8a10853"
}
]
}
],
"database_specific": {
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}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.17.0"
},
{
"fixed": "6.1.129"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.78"
}
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{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
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{
"fixed": "6.12.14"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.13.3"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21832.json"
}
}
],
"modified": "2026-10-28T02:30:39.407609970Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
"https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473",
"https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb",
"https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474",
"https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77",
"https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853",
"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21832.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-21832",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21832.json"
}
},
"related_cves": [
{
"value": "CVE-2025-21832",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506459,
"published_at": "2025-03-06T16:22:34.125+00:00"
}