CVE-2026-74646
misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke
Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Acquire fl->lock before moving mmaps.
- Ensure consistent locking around fl->mmaps access.
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-2026-74646.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74646 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-2026-74646
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-2026-74646 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74646 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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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 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': '76e8e4ace1ed2c97dba3b1370e0e105e07c572bc', 'lessThan': '3f265e405e5ef85030c3777262e18bb556bc8724', 'versionType': 'git'}, {'status': 'affected', 'version': '76e8e4ace1ed2c97dba3b1370e0e105e07c572bc', 'lessThan': 'a902fe1f80f58a2335b6be1131866f827ec44d1a', 'versionType': 'git'}, {'status': 'affected', 'version': '76e8e4ace1ed2c97dba3b1370e0e105e07c572bc', 'lessThan': 'af6345159abcbaa550518f31990d2a9558c2d369', 'versionType': 'git'}, {'status': 'affected', 'version': '76e8e4ace1ed2c97dba3b1370e0e105e07c572bc', 'lessThan': 'efd02f8d1a7449f15809bc18d3cd41aafea75d7e', 'versionType': 'git'}, {'status': 'affected', 'version': '76e8e4ace1ed2c97dba3b1370e0e105e07c572bc', 'lessThan': 'b85a0e91d7d6cd06a53c881a46f749cfcef416a2', 'versionType': 'git'}], 'programFiles': ['drivers/misc/fastrpc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/misc/fastrpc.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor. Added Reference https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724 Added Reference https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a Added Reference https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369 Added Reference https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2 Added Reference https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e