In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Check the return value of of_property_read_string_index()…
A vulnerability in the Linux kernel's brcmfmac WiFi driver was resolved by adding a check for the return value of the function of_property_read_string_index(). Without this check, the driver could crash due to passing an uninitialized pointer to devm_kstrdup(), leading to a kernel page fault. This issue was observed between kernel versions 6.10 and 6.11. The vulnerability causes a denial of service via a kernel crash but does not impact confidentiality or integrity.
AI Analysis
Technical Summary
The Linux kernel's brcmfmac WiFi driver lacked proper validation of the return value from of_property_read_string_index(). When the property did not exist, the variable 'tmp' remained uninitialized, resulting in a random pointer being passed to devm_kstrdup(). This led to a kernel crash with a page fault error. The issue was introduced sometime between kernel versions 6.10 and 6.11 and was fixed by adding the necessary return value check. The vulnerability results in a denial of service condition due to kernel crashes but does not affect data confidentiality or integrity.
Potential Impact
The vulnerability causes the affected Linux kernel to crash when the brcmfmac driver attempts to read a non-existent property without checking the return value, leading to an uninitialized pointer dereference. This results in a denial of service (system crash). There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 6.11 and later. Users and administrators should upgrade to a patched kernel version at or beyond 6.11 to remediate this issue. Patch status is confirmed by the resolution between versions 6.10 and 6.11. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Check the return value of of_property_read_string_index()…
Description
A vulnerability in the Linux kernel's brcmfmac WiFi driver was resolved by adding a check for the return value of the function of_property_read_string_index(). Without this check, the driver could crash due to passing an uninitialized pointer to devm_kstrdup(), leading to a kernel page fault. This issue was observed between kernel versions 6.10 and 6.11. The vulnerability causes a denial of service via a kernel crash but does not impact confidentiality or integrity.
CVSS v3.1
Score 5.5medium
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=bluefield/noblepkg:deb/ubuntu/[email protected]+fips1?arch=source&distro=fips-updates/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=realtime/nobleRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's brcmfmac WiFi driver lacked proper validation of the return value from of_property_read_string_index(). When the property did not exist, the variable 'tmp' remained uninitialized, resulting in a random pointer being passed to devm_kstrdup(). This led to a kernel crash with a page fault error. The issue was introduced sometime between kernel versions 6.10 and 6.11 and was fixed by adding the necessary return value check. The vulnerability results in a denial of service condition due to kernel crashes but does not affect data confidentiality or integrity.
Potential Impact
The vulnerability causes the affected Linux kernel to crash when the brcmfmac driver attempts to read a non-existent property without checking the return value, leading to an uninitialized pointer dereference. This results in a denial of service (system crash). There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 6.11 and later. Users and administrators should upgrade to a patched kernel version at or beyond 6.11 to remediate this issue. Patch status is confirmed by the resolution between versions 6.10 and 6.11. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-21750
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5fd1381010f89cc21c5cd7
Added to database: 07/21/2026, 20:06:16 UTC
Last enriched: 07/23/2026, 03:26:31 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 6
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