CVE-2026-74647
misc: fastrpc: Remove buffer from list prior to unmap operation
Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Remove buffer from list prior to unmap operation fastrpc_req_munmap_impl() is called to unmap any buffer. The buffer is getting removed from the list after it is unmapped from DSP. This can create potential race conditions if multiple threads invoke unmap concurrently, where one thread may remove the entry from the list while another thread's unmap operation is still ongoing. Fix this by removing the buffer entry from the list before calling the unmap operation. If the unmap fails, the entry is re-added to the list so that userspace can retry the unmap, or alternatively, the buffer will be cleaned up during device release when the DSP process is torn down and all DSP-side mappings are freed along with remaining buffers in the list.
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
- Remove buffer from list before unmap operation.
- Re-add entry if unmap operation fails.
- Ensure cleanup during device release.
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-2026-74647.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74647 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-2026-74647
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-2026-74647 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74647 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': '2419e55e532de14fdf336e09e453aa2831c73a25', 'lessThan': '97273624f7b356eaf8261609a75cfcb8738a165a', 'versionType': 'git'}, {'status': 'affected', 'version': '2419e55e532de14fdf336e09e453aa2831c73a25', 'lessThan': 'fe70329055977fc1e8dc6291318d0dd75470795a', 'versionType': 'git'}, {'status': 'affected', 'version': '2419e55e532de14fdf336e09e453aa2831c73a25', 'lessThan': '9bf22a7d950cec2d1efeca7f16bb20fcca84c36a', 'versionType': 'git'}, {'status': 'affected', 'version': '2419e55e532de14fdf336e09e453aa2831c73a25', 'lessThan': '0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5', 'versionType': 'git'}, {'status': 'affected', 'version': '2419e55e532de14fdf336e09e453aa2831c73a25', 'lessThan': '6102ceb4eab845743ee57acd3863fbd06e93c927', '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': '5.5'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.5', '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: Remove buffer from list prior to unmap operation fastrpc_req_munmap_impl() is called to unmap any buffer. The buffer is getting removed from the list after it is unmapped from DSP. This can create potential race conditions if multiple threads invoke unmap concurrently, where one thread may remove the entry from the list while another thread's unmap operation is still ongoing. Fix this by removing the buffer entry from the list before calling the unmap operation. If the unmap fails, the entry is re-added to the list so that userspace can retry the unmap, or alternatively, the buffer will be cleaned up during device release when the DSP process is torn down and all DSP-side mappings are freed along with remaining buffers in the list. Added Reference https://git.kernel.org/stable/c/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5 Added Reference https://git.kernel.org/stable/c/6102ceb4eab845743ee57acd3863fbd06e93c927 Added Reference https://git.kernel.org/stable/c/97273624f7b356eaf8261609a75cfcb8738a165a Added Reference https://git.kernel.org/stable/c/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a Added Reference https://git.kernel.org/stable/c/fe70329055977fc1e8dc6291318d0dd75470795a