Linux Kernel up to 7.2-rc3 brcmfmac brcmf_sdio_probe use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k3.00

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5/7.2-rc3. The affected element is the function brcmf_sdio_probe of the component brcmfmac. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2026-68403. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5/7.2-rc3. This issue affects the function brcmf_sdio_probe of the component brcmfmac. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: initialize SDIO data work before cleanup brcmf_sdio_probe() stores the newly allocated bus in sdiodev->bus before allocating the ordered workqueue. If that allocation fails, the function jumps to fail and calls brcmf_sdio_remove(). brcmf_sdio_remove() unconditionally cancels bus->datawork. Initialize the work item before the first failure path that can reach brcmf_sdio_remove(), so the cleanup path always observes a valid work object. This issue was found by our static analysis tool and then confirmed by manual review of the probe error path and the remove-time work drain. The problem pattern is an early setup failure that reaches a cleanup helper which cancels an embedded work item before its initializer has run. A QEMU PoC forced alloc_ordered_workqueue() to fail at the same point in brcmf_sdio_probe(), before INIT_WORK(&bus->datawork) is reached. The resulting fail path calls brcmf_sdio_remove(), and DEBUG_OBJECTS reports the invalid work drain with brcmf_sdio_probe() and brcmf_sdio_remove() in the stack.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-68403 since 07/30/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/10/2026).

Upgrading to version 6.6.148, 6.12.101, 6.18.42, 7.1.6 or 7.2-rc4 eliminates this vulnerability. Applying the patch f50a2b9e57a751e70ae9a272875d80d39eaccd6a/6bd21ec8549a5854dd64204a66289952917a924c/5c342437ea44bb829680ca9e4f683dd5b325b219/c73c3fc1c7ca5a927639f0884624cb244ba791e4/2a665946e0407a05a3f81bd56a08553c446498e0 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.148/6.12.101/6.18.42/7.1.6/7.2-rc4
Patch: f50a2b9e57a751e70ae9a272875d80d39eaccd6a/6bd21ec8549a5854dd64204a66289952917a924c/5c342437ea44bb829680ca9e4f683dd5b325b219/c73c3fc1c7ca5a927639f0884624cb244ba791e4/2a665946e0407a05a3f81bd56a08553c446498e0

Timelineinfo

07/30/2026 CVE reserved
08/10/2026 +11 days Advisory disclosed
08/10/2026 +0 days VulDB entry created
08/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-68403 (🔒)
GCVE (CVE): GCVE-0-2026-68403
GCVE (VulDB): GCVE-100-387767

Entryinfo

Created: 08/10/2026 18:32
Changes: 08/10/2026 18:32 (59)
Complete: 🔍
Cache ID: 216::103

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