module/dups: Fix use-after-free in kmod_dup_req lifetime handling
In the Linux kernel, the following vulnerability has been resolved: module/dups: Fix use-after-free in kmod_dup_req lifetime handling The kmod dups code uses RCU to ensure that a kmod_dup_req instance is freed only after it is no longer referenced. When releasing an instance, the kmod_dup_request_delete() function removes the kmod_dup_req from the dup_kmod_reqs list, waits via synchronize_rcu() and finally frees it. However, this doesn't work correctly because parallel users referencing the instance in kmod_dup_request_exists_wait() don't enter an RCU read-side critical section. This can result in a use-after-free. The kmod_dup_request_exists_wait() function may need to hold a valid reference to a kmod_dup_req instance across a blocking wait until the corresponding modprobe command completes. This makes it unsuitable for RCU. Fix the issue by changing the lifecycle management of kmod_dup_req to use reference counting.
CVE-2026-90291
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-2026-90291
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": "8660484ed1cf3261e89e0bad94c6395597e87599",
"lessThan": "a3205bd1f218053575589b14caf8df667f344134",
"versionType": "git"
},
{
"status": "affected",
"version": "8660484ed1cf3261e89e0bad94c6395597e87599",
"lessThan": "2c85e0fb528e039aa8ea1e9c2a1f64347f990541",
"versionType": "git"
},
{
"status": "affected",
"version": "8660484ed1cf3261e89e0bad94c6395597e87599",
"lessThan": "b2709aad7599f6fd957939b60f4a8323c8f08072",
"versionType": "git"
},
{
"status": "affected",
"version": "8660484ed1cf3261e89e0bad94c6395597e87599",
"lessThan": "cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca",
"versionType": "git"
},
{
"status": "affected",
"version": "8660484ed1cf3261e89e0bad94c6395597e87599",
"lessThan": "5eecb11b543f9f417bcf0dea239ff99c6af65dbd",
"versionType": "git"
}
],
"programFiles": [
"kernel/module/dups.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/module/dups.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90291
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48656 · Revision 1
- Added to Heist Feed
- Publisher date