Linux Kernel up to 6.17-rc2 request_irq out-of-bounds

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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.17-rc2. Affected by this issue is the function request_irq. The manipulation leads to out-of-bounds. This vulnerability is referenced as CVE-2025-39685. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.17-rc2. This issue affects the function request_irq. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: comedi: pcl726: Prevent invalid irq number The reproducer passed in an irq number(0x80008000) that was too large, which triggered the oob. Added an interrupt number check to prevent users from passing in an irq number that was too large. If `it->options[1]` is 31, then `1 << it->options[1]` is still invalid because it shifts a 1-bit into the sign bit (which is UB in C). Possible solutions include reducing the upper bound on the `it->options[1]` value to 30 or lower, or using `1U << it->options[1]`. The old code would just not attempt to request the IRQ if the `options[1]` value were invalid. And it would still configure the device without interrupts even if the call to `request_irq` returned an error. So it would be better to combine this test with the test below.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2025-39685 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 261637 (Linux Distros Unpatched Vulnerability : CVE-2025-39685), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 or 6.17-rc3 eliminates this vulnerability. Applying the patch bab220b0bb5af652007e278e8e8357f952b0e1ea/5a33d07c94ba91306093e823112a7aa9727549f6/0eb4ed2aa261dee228f1668dbfa6d87353e8162d/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6/d8992c9a01f81128f36acb7c5755530e21fcd059/96cb948408b3adb69df7e451ba7da9d21f814d00 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (261637) and CERT Bund (WID-SEC-2025-1988). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • NetApp FAS
  • NetApp AFF
  • NetApp ActiveIQ Unified Manager
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Microsoft Azure
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM
  • IBM Security Verify Access
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 261637
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39685

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.190/6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc3
Patch: bab220b0bb5af652007e278e8e8357f952b0e1ea/5a33d07c94ba91306093e823112a7aa9727549f6/0eb4ed2aa261dee228f1668dbfa6d87353e8162d/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6/d8992c9a01f81128f36acb7c5755530e21fcd059/96cb948408b3adb69df7e451ba7da9d21f814d00

Timelineinfo

04/16/2025 CVE reserved
09/05/2025 +142 days Advisory disclosed
09/05/2025 +0 days VulDB entry created
02/09/2026 +157 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39685 (🔒)
GCVE (CVE): GCVE-0-2025-39685
GCVE (VulDB): GCVE-100-322895
CERT Bund: WID-SEC-2025-1988 - Linux Kernel: Mehrere Schwachstellen erm&ouml;glichen Denial of Service

Entryinfo

Created: 09/05/2025 21:45
Updated: 02/09/2026 16:44
Changes: 09/05/2025 21:45 (58), 09/07/2025 05:14 (2), 11/06/2025 17:47 (7), 11/26/2025 07:23 (1), 11/27/2025 16:56 (1), 01/03/2026 12:12 (1), 01/05/2026 10:32 (1), 01/09/2026 07:30 (12), 02/09/2026 16:44 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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