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7.8
HIGH CVSS 3.1
CVE-2026-74456
can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer. If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer. BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285 Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0 Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").

Details
INFO

Published Date :

Aug. 15, 2026, 1:17 p.m.

Last Modified :

Aug. 17, 2026, 6:19 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-74456 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Remove redundant buffer free to prevent double-free memory corruption.
  • Remove the explicit kfree(buf) call.
  • Ensure usb_free_urb() handles buffer deallocation.
  • Apply kernel patches addressing this issue.
  • Update the Linux kernel.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-74456.

URL Resource
https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b
https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba
https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0
https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9
https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-74456 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-74456 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-74456 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-74456 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '525640b93d3e5f82f4ebea4730f4e0cf799522ba', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '4bb3325075138dd5346b71589a959878b564dc0b', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '92d0de80ca2223b9c7da78020155b6cb27824cc0', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': 'dfb17bf04a764462000f11258a7c06aa92d1f261', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9', 'versionType': 'git'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '525640b93d3e5f82f4ebea4730f4e0cf799522ba', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '4bb3325075138dd5346b71589a959878b564dc0b', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '92d0de80ca2223b9c7da78020155b6cb27824cc0', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': 'dfb17bf04a764462000f11258a7c06aa92d1f261', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9', 'versionType': 'git'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '525640b93d3e5f82f4ebea4730f4e0cf799522ba', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '4bb3325075138dd5346b71589a959878b564dc0b', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '92d0de80ca2223b9c7da78020155b6cb27824cc0', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': 'dfb17bf04a764462000f11258a7c06aa92d1f261', 'versionType': 'git'}, {'status': 'affected', 'version': 'bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d', 'lessThan': '9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9', 'versionType': 'git'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/can/usb/peak_usb/pcan_usb_core.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer. If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer. BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285 Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0 Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").
    Added Reference https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b
    Added Reference https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba
    Added Reference https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0
    Added Reference https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9
    Added Reference https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact