Linux Kernel up to 6.12.109/6.18.51/7.2.5 dups kernel/module/dups.c kmod_dup_request_exists_wait use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.7$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.12.109/6.18.51/7.2.5. Affected by this issue is the function kmod_dup_request_exists_wait of the file kernel/module/dups.c of the component dups. Such manipulation leads to use after free. This vulnerability is traded as CVE-2026-90291. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.109/6.18.51/7.2.5 and classified as very critical. Affected by this issue is the function kmod_dup_request_exists_wait of the file kernel/module/dups.c of the component dups. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-90291 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are needed for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 2c85e0fb528e039aa8ea1e9c2a1f64347f990541/b2709aad7599f6fd957939b60f4a8323c8f08072/cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca/5eecb11b543f9f417bcf0dea239ff99c6af65dbd is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Name

Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 2c85e0fb528e039aa8ea1e9c2a1f64347f990541/b2709aad7599f6fd957939b60f4a8323c8f08072/cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca/5eecb11b543f9f417bcf0dea239ff99c6af65dbd

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90291 (🔒)
GCVE (CVE): GCVE-0-2026-90291
GCVE (VulDB): GCVE-100-406814

Entryinfo

Created: 09/17/2026 21:19
Changes: 09/17/2026 21:19 (60)
Complete: 🔍
Cache ID: 216::103

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