CVE-2026-72482
gpib: fix double decrement of descriptor_busy in command_ioctl()
Description
In the Linux kernel, the following vulnerability has been resolved: gpib: fix double decrement of descriptor_busy in command_ioctl() commit d1857f8296dc ("gpib: fix use-after-free in IO ioctl handlers") introduced a descriptor_busy reference counter to pin struct gpib_descriptor across IO ioctl operations. In command_ioctl(), the error path inside the loop decrements descriptor_busy and breaks, but execution then falls through to the unconditional decrement after the loop, underflowing the counter to -1. This re-enables the use-after-free that the original fix was meant to prevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on an actively-used descriptor and frees it. Remove the early decrement from the error path. The post-loop decrement already handles all exit paths, matching the correct pattern used in read_ioctl() and write_ioctl().
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:19 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Remove the early decrement in the error path.
- Ensure post-loop decrement handles all exit paths.
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-2026-72482.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72482 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-2026-72482
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-2026-72482 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72482 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': 'cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c', 'lessThan': 'fdee9f207a48ce204ec6cfceaa1459d2473600a5', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': '8b5f1d295dda8677e4545ce340053fcfa8b634c7', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': 'c4faab452b3c1ada003d49c477609dd80523b9bf', 'versionType': 'git'}, {'status': 'affected', 'version': '28c75dd143ead62e0dfac564c79d251e21d5d74b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.18.22', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.12', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['drivers/gpib/common/gpib_os.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/gpib/common/gpib_os.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c', 'lessThan': 'fdee9f207a48ce204ec6cfceaa1459d2473600a5', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': '8b5f1d295dda8677e4545ce340053fcfa8b634c7', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': 'c4faab452b3c1ada003d49c477609dd80523b9bf', 'versionType': 'git'}, {'status': 'affected', 'version': '28c75dd143ead62e0dfac564c79d251e21d5d74b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.18.22', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.12', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['drivers/gpib/common/gpib_os.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/gpib/common/gpib_os.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': 'cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c', 'lessThan': 'fdee9f207a48ce204ec6cfceaa1459d2473600a5', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': '8b5f1d295dda8677e4545ce340053fcfa8b634c7', 'versionType': 'git'}, {'status': 'affected', 'version': 'd1857f8296dceb75d00ab857fc3c61bc00c7f5c6', 'lessThan': 'c4faab452b3c1ada003d49c477609dd80523b9bf', 'versionType': 'git'}, {'status': 'affected', 'version': '28c75dd143ead62e0dfac564c79d251e21d5d74b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.18.22', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.12', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['drivers/gpib/common/gpib_os.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/gpib/common/gpib_os.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: gpib: fix double decrement of descriptor_busy in command_ioctl() commit d1857f8296dc ("gpib: fix use-after-free in IO ioctl handlers") introduced a descriptor_busy reference counter to pin struct gpib_descriptor across IO ioctl operations. In command_ioctl(), the error path inside the loop decrements descriptor_busy and breaks, but execution then falls through to the unconditional decrement after the loop, underflowing the counter to -1. This re-enables the use-after-free that the original fix was meant to prevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on an actively-used descriptor and frees it. Remove the early decrement from the error path. The post-loop decrement already handles all exit paths, matching the correct pattern used in read_ioctl() and write_ioctl(). Added Reference https://git.kernel.org/stable/c/8b5f1d295dda8677e4545ce340053fcfa8b634c7 Added Reference https://git.kernel.org/stable/c/c4faab452b3c1ada003d49c477609dd80523b9bf Added Reference https://git.kernel.org/stable/c/fdee9f207a48ce204ec6cfceaa1459d2473600a5