Linux Kernel up to 6.19.8 wdm_read uninitialized pointer

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.19.8 and classified as critical. Affected by this issue is the function wdm_read. Performing a manipulation results in uninitialized pointer. This vulnerability was named CVE-2026-43427. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.19.8. This affects the function wdm_read. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. CWE is classifying the issue as CWE-824. The product accesses or uses a pointer that has not been initialized. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43427 since 05/01/2026. The exploitability is told to be difficult. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313398 (Linux Distros Unpatched Vulnerability : CVE-2026-43427), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 638328ca9c17ae6511ad62198c57bae32ffa3c91/170e8daca24da6edb4be82ab01abf44e87af387b/c8fa96ed021923dae147bcd9f9205b8df7b82360/4ee3062bf2c9a722afef429826e8607eaf3fc6a0/276aef0fd2b92f41b920ac891c72cadeee957934/67ed312124bb1b61858778ac0b985b48961c862a/e3c874b05901dc519054b5107d16620e6d2b5fea/8df672bfe3ec2268c2636584202755898e547173 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 vulnerability database at Tenable (313398). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.1
VulDB Temp Score: 6.8
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: Uninitialized pointer
CWE: CWE-824 / CWE-908
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: 313398
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-43427

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/5.15.203/6.1.167/6.6.130/6.12.78/6.18.19/6.19.9
Patch: 638328ca9c17ae6511ad62198c57bae32ffa3c91/170e8daca24da6edb4be82ab01abf44e87af387b/c8fa96ed021923dae147bcd9f9205b8df7b82360/4ee3062bf2c9a722afef429826e8607eaf3fc6a0/276aef0fd2b92f41b920ac891c72cadeee957934/67ed312124bb1b61858778ac0b985b48961c862a/e3c874b05901dc519054b5107d16620e6d2b5fea/8df672bfe3ec2268c2636584202755898e547173

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
05/21/2026 +13 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43427 (🔒)
GCVE (CVE): GCVE-0-2026-43427
GCVE (VulDB): GCVE-100-362253

Entryinfo

Created: 05/08/2026 18:34
Updated: 05/21/2026 03:20
Changes: 05/08/2026 18:34 (58), 05/09/2026 07:32 (2), 05/21/2026 03:20 (10)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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