io_uring/kbuf: reallocate buf lists on upgrade
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
CVE-2025-21836
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21836
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2fcabce2d7d34f69a888146dab15b36a917f09d4",
"lessThan": "146a185f6c05ee263db715f860620606303c4633",
"versionType": "git"
},
{
"status": "affected",
"version": "2fcabce2d7d34f69a888146dab15b36a917f09d4",
"lessThan": "7d0dc28dae836caf7645fef62a10befc624dd17b",
"versionType": "git"
},
{
"status": "affected",
"version": "2fcabce2d7d34f69a888146dab15b36a917f09d4",
"lessThan": "2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4",
"versionType": "git"
},
{
"status": "affected",
"version": "2fcabce2d7d34f69a888146dab15b36a917f09d4",
"lessThan": "8802766324e1f5d414a81ac43365c20142e85603",
"versionType": "git"
}
],
"programFiles": [
"io_uring/kbuf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.79",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.16",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.4",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"io_uring/kbuf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21836
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30437 · Revision 1
- Added to Heist Feed
- Publisher date