CVE-2026-68192 - Vulnerability Details

- 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.

Published: 2026-08-10

Score: 8.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The brcmfmac Wi‑Fi driver in the Linux kernel contains a double‑free flaw: it frees shared DMA buffers during a reset or removal without clearing their pointers. If a reset occurs before the device is removed, the second free attempts deallocate already‑freed memory and can corrupt kernel memory, leading to a crash.

Affected Systems

All Linux systems that ship the brcmfmac module, such as most mainstream distributions. The exact kernel versions are not specified, but any kernel containing this driver is potentially affected.

Risk and Exploitability

The CVSS score is 8.8 and the EPSS score is below 1 %. The vulnerability is not listed in CISA KEV. The flaw is a classic double‑free in kernel space; if an attacker can trigger a reset followed by removal, the driver may execute the second free and cause an oops. No public exploit is known and the low EPSS suggests a low likelihood of widespread attack, yet the impact can be a kernel crash or disruption of system availability.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 81c58a206d1deee01f4c29236d4154c0872f2a38
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 382ee00b2d1e31869ae576a60d3fbe7a2153512f
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 739b686aecdb14a6065300ea53401f043e51fd22
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< b7d1d8cb1bdca56aecebacd2896615da0acc126a
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 5a045c2f0fbf029873d2295178fa0785ade35af0
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 044fca8f45ba9ab6ca526163155234cf88287ff5
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 0ca80328df23f851c86866720d4977783c919ee6
`4684997d9eea29380000e062755aa6d368d789a3`	affected	< 538c51e9d124cf656f2dd0c0394a8545efc7102d

Linux

affected

Version	Status	Constraints
`5.2`	affected	—
`0`	unaffected	< 5.2
`5.10.265`	unaffected	≤ 5.10.*
`5.15.216`	unaffected	≤ 5.15.*
`6.1.183`	unaffected	≤ 6.1.*
`6.6.148`	unaffected	≤ 6.6.*
`6.12.101`	unaffected	≤ 6.12.*
`6.18.42`	unaffected	≤ 6.18.*
`7.1.6`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[4684997d9eea29380000e062755aa6d368d789a3,b7d1d8cb1bdca56aecebacd2896615da0acc126a)`	affected	code_commit	—
`[4684997d9eea29380000e062755aa6d368d789a3,5a045c2f0fbf029873d2295178fa0785ade35af0)`	affected	code_commit	—
`[4684997d9eea29380000e062755aa6d368d789a3,044fca8f45ba9ab6ca526163155234cf88287ff5)`	affected	code_commit	—
`[4684997d9eea29380000e062755aa6d368d789a3,0ca80328df23f851c86866720d4977783c919ee6)`	affected	code_commit	—
`[4684997d9eea29380000e062755aa6d368d789a3,538c51e9d124cf656f2dd0c0394a8545efc7102d)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`5.2`	affected	generic	—
`[0,5.2)`	unaffected	generic	—
`[6.6.148,6.7.0]`	unaffected	semver	—
`[6.12.101,6.13.0]`	unaffected	semver	—
`[6.18.42,6.19.0]`	unaffected	semver	—
`[7.1.6,7.2.0]`	unaffected	semver	—
`[7.2-rc5,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Upgrade the Linux kernel to a version that includes the brcmfmac release_scratchbuffers idempotent patch
If a kernel upgrade is not possible, disable or unload the brcmfmac Wi‑Fi module to prevent driver operations that could trigger the fault
For custom kernel builds, cherry‑pick the commit that adds pointer clearing after freeing and rebuild the kernel

Generated by OpenCVE AI on August 14, 2026 at 04:07 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4745-1	linux-6.12 security update

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00412.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5
https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6
https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f
https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d
https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0
https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22
https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38
https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a

History

Wed, 19 Aug 2026 16:45:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22 https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38

Fri, 14 Aug 2026 04:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-415

Fri, 14 Aug 2026 02:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-415

Thu, 13 Aug 2026 22:45:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}`

Mon, 10 Aug 2026 19:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-415

Mon, 10 Aug 2026 12:30:00 +0000

Type	Values Removed	Values 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.
Title		wifi: brcmfmac: make release_scratchbuffers idempotent
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5 https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6 https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0 https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-10T12:00:10.041Z

Updated: 2026-08-19T16:31:06.873Z

Reserved: 2026-07-30T09:28:09.373Z

Link: CVE-2026-68192

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-10T13:20:06.543

Modified: 2026-08-19T17:20:35.413

Link: CVE-2026-68192

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-14T04:15:03Z

Weaknesses

CWE-415
Double Free

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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