Linux Kernel up to 6.18.44/7.1.8 dibs dibs_dev_alloc uninitialized variable

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.44/7.1.8. It has been declared as very critical. The affected element is the function dibs_dev_alloc of the component dibs. Such manipulation leads to uninitialized variable. This vulnerability is referenced as CVE-2026-74617. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 6.18.44/7.1.8. Affected by this issue is the function dibs_dev_alloc of the component dibs. The manipulation with an unknown input leads to a uninitialized variable vulnerability. Using CWE to declare the problem leads to CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: dibs: initialise dibs->lock in dibs_dev_alloc() dibs->lock is initialised by dibs_dev_add(), but a dibs device can already take interrupts before that call: ism_probe() runs ism_dev_init(), and hence request_irq(), before it calls dibs_dev_add(). No client can have registered a dmb at that point, so no dmb interrupt can occur, but a GID event interrupt can, and ism_handle_irq() takes dibs->lock unconditionally on entry, before it inspects anything else. Initialise the lock in dibs_dev_alloc() instead, so that it is valid as soon as a driver can publish the device to its interrupt handler.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-74617 since 08/15/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/24/2026).

The vulnerability scanner Nessus provides a plugin with the ID 339006 (Linux Distros Unpatched Vulnerability : CVE-2026-74617), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch fe79571f40434b257d68cbfb7b3ae93a794d8a11/2926031acba100d0c18fcfaa7a2ed29609318848/c27e360545373b7aee9862a5beef3b9fb3df0c25 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (339006) and CERT Bund (WID-SEC-2026-2970). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Uninitialized variable
CWE: CWE-457 / CWE-453
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 339006
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-74617

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.45/7.1.9
Patch: fe79571f40434b257d68cbfb7b3ae93a794d8a11/2926031acba100d0c18fcfaa7a2ed29609318848/c27e360545373b7aee9862a5beef3b9fb3df0c25

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/24/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74617 (🔒)
GCVE (CVE): GCVE-0-2026-74617
GCVE (VulDB): GCVE-100-394400
CERT Bund: WID-SEC-2026-2970 - Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 08/22/2026 18:15
Updated: 08/24/2026 22:47
Changes: 08/22/2026 18:15 (59), 08/23/2026 17:24 (2), 08/24/2026 22:47 (7)
Complete: 🔍
Cache ID: 216::103

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