module/dups: Fix use-after-free in kmod_dup_req lifetime handling (CVE-2026-90291) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90291

module/dups: Fix use-after-free in kmod_dup_req lifetime handling

Answer in brief

CVE-2026-90291 records a Unknown severity vulnerability in module/dups: Fix use-after-free in kmod_dup_req lifetime handling. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=8660484ed1cf3261e89e0bad94c6395597e87599 <2c85e0fb528e039aa8ea1e9c2a1f64347f990541 \|\| >=8660484ed1cf3261e89e0bad94c6395597e87599 <b2709aad7599f6fd957939b60f4a8323c8f08072 \|\| >=8660484ed1cf3261e89e0bad94c6395597e87599 <cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca \|\| >=8660484ed1cf3261e89e0bad94c6395597e87599 <5eecb11b543f9f417bcf0dea239ff99c6af65dbd	2c85e0fb528e039aa8ea1e9c2a1f64347f990541, b2709aad7599f6fd957939b60f4a8323c8f08072, cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca, 5eecb11b543f9f417bcf0dea239ff99c6af65dbd
Linux/Linuxgeneric	6.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2c85e0fb528e039aa8ea1e9c2a1f64347f990541 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.