Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0 usb pn_rx_complete frags[] heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

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. This issue affects the function pn_rx_complete of the component usb. Such manipulation of the argument frags[] leads to heap-based overflow. This vulnerability is documented as CVE-2026-31616. The attack requires being on the local network. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0. It has been rated as critical. Affected by this issue is the function pn_rx_complete of the component usb. The manipulation of the argument frags[] with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete() A broken/bored/mean USB host can overflow the skb_shared_info->frags[] array on a Linux gadget exposing a Phonet function by sending an unbounded sequence of full-page OUT transfers. pn_rx_complete() finalizes the skb only when req->actual < req->length, where req->length is set to PAGE_SIZE by the gadget. If the host always sends exactly PAGE_SIZE bytes per transfer, fp->rx.skb will never be reset and each completion will add another fragment via skb_add_rx_frag(). Once nr_frags exceeds MAX_SKB_FRAGS (default 17), subsequent frag stores overwrite memory adjacent to the shinfo on the heap. Drop the skb and account a length error when the frag limit is reached, matching the fix applied in t7xx by commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path").

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-31616 since 03/09/2026. The exploitation is known to be easy. The attack can only be initiated within the local network. 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 06/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310283 (Linux Distros Unpatched Vulnerability : CVE-2026-31616), 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 c9315ce9da3632c591666a29de82d3e92d46bec1/4e476c25bfcab0535ba7c76a903ae77ca8747711/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7/66f7471c4042e4eb300e30b5b9d87d1406862673 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 (310283), EUVD (EUVD-2026-25509) and CERT Bund (WID-SEC-2026-1279). Once again VulDB remains the best source for vulnerability data.

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: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / 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: 310283
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31616

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: c9315ce9da3632c591666a29de82d3e92d46bec1/4e476c25bfcab0535ba7c76a903ae77ca8747711/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7/66f7471c4042e4eb300e30b5b9d87d1406862673

Timelineinfo

03/09/2026 CVE reserved
04/24/2026 +45 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
06/03/2026 +40 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31616 (🔒)
GCVE (CVE): GCVE-0-2026-31616
GCVE (VulDB): GCVE-100-359396
EUVD: 🔒
CERT Bund: WID-SEC-2026-1279 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/24/2026 17:53
Updated: 06/03/2026 14:21
Changes: 04/24/2026 17:53 (60), 04/26/2026 01:01 (1), 04/27/2026 11:35 (2), 05/26/2026 07:38 (7), 06/03/2026 14:21 (12)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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