CVE-2026-72383
sctp: fix addr_wq_timer race in sctp_free_addr_wq()
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix addr_wq_timer race in sctp_free_addr_wq() sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete() while holding addr_wq_lock. However, timer_delete() does not guarantee that a currently running timer handler has completed. This allows a race with sctp_addr_wq_timeout_handler(), where the handler may still run after addr_waitq has been freed, acquire addr_wq_lock, and access freed memory, leading to a use-after-free. Fix this by calling timer_shutdown_sync() before taking addr_wq_lock. This guarantees that any in-flight timer handler has finished and prevents the timer from being re-armed during teardown, making subsequent cleanup safe.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:18 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
- Apply the Linux kernel patch for sctp.
- Ensure timer handlers complete before cleanup.
- Synchronize timer shutdown before acquiring lock.
- Prevent timer re-arming during teardown.
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-2026-72383.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72383 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-2026-72383
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-2026-72383 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72383 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.
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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': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'a8323fb2ab6cd6978f359daeed6688e0cadf32ba', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': '976c19de0f22a857ba0112f39635f8fd7a257568', 'versionType': 'git'}], 'programFiles': ['net/sctp/protocol.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.7', '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-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/protocol.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'a8323fb2ab6cd6978f359daeed6688e0cadf32ba', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': '976c19de0f22a857ba0112f39635f8fd7a257568', 'versionType': 'git'}], 'programFiles': ['net/sctp/protocol.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.7', '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': ['net/sctp/protocol.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': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'a8323fb2ab6cd6978f359daeed6688e0cadf32ba', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': 'c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1', 'versionType': 'git'}, {'status': 'affected', 'version': '4db67e808640e3934d82ce61ee8e2e89fd877ba8', 'lessThan': '976c19de0f22a857ba0112f39635f8fd7a257568', 'versionType': 'git'}], 'programFiles': ['net/sctp/protocol.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.7', '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-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/protocol.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: sctp: fix addr_wq_timer race in sctp_free_addr_wq() sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete() while holding addr_wq_lock. However, timer_delete() does not guarantee that a currently running timer handler has completed. This allows a race with sctp_addr_wq_timeout_handler(), where the handler may still run after addr_waitq has been freed, acquire addr_wq_lock, and access freed memory, leading to a use-after-free. Fix this by calling timer_shutdown_sync() before taking addr_wq_lock. This guarantees that any in-flight timer handler has finished and prevents the timer from being re-armed during teardown, making subsequent cleanup safe. Added Reference https://git.kernel.org/stable/c/976c19de0f22a857ba0112f39635f8fd7a257568 Added Reference https://git.kernel.org/stable/c/a8323fb2ab6cd6978f359daeed6688e0cadf32ba Added Reference https://git.kernel.org/stable/c/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1