rapidio: mport_cdev: fix use-after-free in dma_req_free()
In the Linux kernel, the following vulnerability has been resolved: rapidio: mport_cdev: fix use-after-free in dma_req_free() dma_req_free() acquires buf_mutex through req->map, drops the mapping reference with kref_put(), and then dereferences req->map again to unlock the mutex. If kref_put() drops the last reference, mport_release_mapping() frees the mapping, and the subsequent mutex_unlock() dereferences a freed object. This is a use-after-free. Fix this by caching map and md before kref_put(), clearing req->map while holding buf_mutex, and using the cached md for mutex unlocking. The bug is reachable from userspace via the RapidIO mport character device interface.
CVE-2026-89742
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-2026-89742
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": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "fc79c07cdcde02c5b17633d78777de6ac2c14b29",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "bd8881c24a9520f9c3d3e855d866197f63e471a7",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "9a9929ec875ff20922c90c96fd544ae8a2a61a8d",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "211c68d817a3d9dc14c0026a59da7cac30f8147e",
"versionType": "git"
},
{
"status": "affected",
"version": "e8de370188d098bb49483c287b44925957c3c9b6",
"lessThan": "5cbef379a94b161726c5f504598bf4791d45cedc",
"versionType": "git"
}
],
"programFiles": [
"drivers/rapidio/devices/rio_mport_cdev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/rapidio/devices/rio_mport_cdev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89742
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35216 · Revision 1
- Added to Heist Feed
- Publisher date