Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0 USB rx_complete frags[] buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0. It has been declared as critical. This affects the function rx_complete of the component USB Handler. The manipulation of the argument frags[] results in an unknown weakness. This vulnerability is known as CVE-2026-31623. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0. Affected is the function rx_complete of the component USB Handler. The manipulation of the argument frags[] with an unknown input leads to a unknown weakness. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers. Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-31623 since 03/09/2026. 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 06/04/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310277 (Linux Distros Unpatched Vulnerability : CVE-2026-31623), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.83, 6.18.24, 6.19.14 or 7.0.1 eliminates this vulnerability. Applying the patch a23b1b1aaf41e174181d5853a70e65d4d01e648c/c183d5775129a0a7495bd61a6e57ec230dcf01e5/ebf75c6301c4972a87542ebf2d994c6391eb5d46/9989938d13cc5ba8447eeed5a61acfcf61bc6801 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 (310277) and CERT Bund (WID-SEC-2026-1279). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Oracle Linux
  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / 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: 310277
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31623

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.83/6.18.24/6.19.14/7.0.1
Patch: a23b1b1aaf41e174181d5853a70e65d4d01e648c/c183d5775129a0a7495bd61a6e57ec230dcf01e5/ebf75c6301c4972a87542ebf2d994c6391eb5d46/9989938d13cc5ba8447eeed5a61acfcf61bc6801

Timelineinfo

03/09/2026 CVE reserved
04/24/2026 +45 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
06/04/2026 +41 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31623 (🔒)
GCVE (CVE): GCVE-0-2026-31623
GCVE (VulDB): GCVE-100-359400
CERT Bund: WID-SEC-2026-1279 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/24/2026 17:56
Updated: 06/04/2026 04:04
Changes: 04/24/2026 17:56 (59), 04/27/2026 19:18 (2), 05/26/2026 08:13 (7), 06/04/2026 04:04 (12)
Complete: 🔍
Cache ID: 216::103

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