CVE-2026-68192
wifi: brcmfmac: make release_scratchbuffers idempotent
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: make release_scratchbuffers idempotent brcmf_pcie_release_scratchbuffers() frees the shared.scratch and shared.ringupd DMA buffers with dma_free_coherent() but does not clear the pointers afterwards, unlike the sibling release_ringbuffers() which NULLs commonrings/flowrings/idxbuf on release. Both the bus_reset .reset callback (brcmf_pcie_reset) and brcmf_pcie_remove() call release_scratchbuffers. When reset teardown has run before removal, remove's own teardown would call dma_free_coherent() a second time on the already-freed DMA allocation. NULL the pointers after free, matching release_ringbuffers(), so a later release observes that the allocation has already been released. This patch makes repeated sequential release safe; the reset-work lifetime is handled separately by the following patch. This issue was found by an in-house static analysis tool.
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 17, 2026, 5:18 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 provided kernel patch.
- Update the Linux kernel.
- Null pointers after freeing DMA buffers.
- Ensure consistent pointer handling.
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-2026-68192.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68192 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-2026-68192
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-2026-68192 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68192 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 Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': 'b7d1d8cb1bdca56aecebacd2896615da0acc126a', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '5a045c2f0fbf029873d2295178fa0785ade35af0', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '044fca8f45ba9ab6ca526163155234cf88287ff5', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '0ca80328df23f851c86866720d4977783c919ee6', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '538c51e9d124cf656f2dd0c0394a8545efc7102d', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': 'b7d1d8cb1bdca56aecebacd2896615da0acc126a', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '5a045c2f0fbf029873d2295178fa0785ade35af0', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '044fca8f45ba9ab6ca526163155234cf88287ff5', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '0ca80328df23f851c86866720d4977783c919ee6', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '538c51e9d124cf656f2dd0c0394a8545efc7102d', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 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': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': 'b7d1d8cb1bdca56aecebacd2896615da0acc126a', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '5a045c2f0fbf029873d2295178fa0785ade35af0', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '044fca8f45ba9ab6ca526163155234cf88287ff5', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '0ca80328df23f851c86866720d4977783c919ee6', 'versionType': 'git'}, {'status': 'affected', 'version': '4684997d9eea29380000e062755aa6d368d789a3', 'lessThan': '538c51e9d124cf656f2dd0c0394a8545efc7102d', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: make release_scratchbuffers idempotent brcmf_pcie_release_scratchbuffers() frees the shared.scratch and shared.ringupd DMA buffers with dma_free_coherent() but does not clear the pointers afterwards, unlike the sibling release_ringbuffers() which NULLs commonrings/flowrings/idxbuf on release. Both the bus_reset .reset callback (brcmf_pcie_reset) and brcmf_pcie_remove() call release_scratchbuffers. When reset teardown has run before removal, remove's own teardown would call dma_free_coherent() a second time on the already-freed DMA allocation. NULL the pointers after free, matching release_ringbuffers(), so a later release observes that the allocation has already been released. This patch makes repeated sequential release safe; the reset-work lifetime is handled separately by the following patch. This issue was found by an in-house static analysis tool. Added Reference https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5 Added Reference https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6 Added Reference https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d Added Reference https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0 Added Reference https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a