Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: phy: stm32-usphyc: Fix off by one in probe() The "index" variable is used as an… (CVE-2025-71196)
A medium severity vulnerability (CVE-2025-71196) in the Linux kernel's stm32-usphyc PHY driver was fixed by correcting an off-by-one error in the probe() function. The issue involved an 'index' variable used to access an array, which could go out of bounds if equal to the array size. The vulnerability was addressed by changing a boundary check from '>' to '>=' to prevent out-of-bounds access. This flaw originated from trusting device tree data, which is unlikely to be incorrect but still posed a risk. The fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS releases. Users are advised to apply the official patches and reboot systems to ensure remediation. No known exploits are reported in the wild.
AI Analysis
Technical Summary
The Linux kernel's stm32-usphyc PHY driver contained an off-by-one error in the probe() function where the 'index' variable, sourced from the device tree, was used as an index into the usbphyc->phys[] array. If 'index' equaled usbphyc->nphys, it resulted in an out-of-bounds array access. Although the device tree data is generally trusted and unlikely to be incorrect, this boundary condition was corrected by changing the comparison operator from '>' to '>=' to prevent potential memory access issues. This vulnerability was fixed in Linux kernel updates distributed by Ubuntu for various 5.15 kernel versions. The fix is part of broader kernel security updates addressing multiple subsystems. No active exploitation has been reported.
Potential Impact
An attacker could potentially exploit the off-by-one error to cause out-of-bounds memory access within the stm32-usphyc PHY driver in the Linux kernel. While the device tree data providing the index is trusted and unlikely to be maliciously crafted, the vulnerability could lead to memory corruption or system instability if triggered. No known exploits in the wild have been reported. The overall impact is considered medium severity due to the limited attack vector and the nature of the flaw.
Mitigation Recommendations
A patch correcting the off-by-one error is available and included in official Ubuntu Linux kernel updates for versions prior to 5.15.0-1105.112~20.04.1 and related builds. Users should apply the latest kernel updates from their distribution repositories and reboot their systems to activate the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No additional mitigation steps are necessary beyond applying the official patches.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: phy: stm32-usphyc: Fix off by one in probe() The "index" variable is used as an… (CVE-2025-71196)
Description
A medium severity vulnerability (CVE-2025-71196) in the Linux kernel's stm32-usphyc PHY driver was fixed by correcting an off-by-one error in the probe() function. The issue involved an 'index' variable used to access an array, which could go out of bounds if equal to the array size. The vulnerability was addressed by changing a boundary check from '>' to '>=' to prevent out-of-bounds access. This flaw originated from trusting device tree data, which is unlikely to be incorrect but still posed a risk. The fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS releases. Users are advised to apply the official patches and reboot systems to ensure remediation. No known exploits are reported in the wild.
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email 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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's stm32-usphyc PHY driver contained an off-by-one error in the probe() function where the 'index' variable, sourced from the device tree, was used as an index into the usbphyc->phys[] array. If 'index' equaled usbphyc->nphys, it resulted in an out-of-bounds array access. Although the device tree data is generally trusted and unlikely to be incorrect, this boundary condition was corrected by changing the comparison operator from '>' to '>=' to prevent potential memory access issues. This vulnerability was fixed in Linux kernel updates distributed by Ubuntu for various 5.15 kernel versions. The fix is part of broader kernel security updates addressing multiple subsystems. No active exploitation has been reported.
Potential Impact
An attacker could potentially exploit the off-by-one error to cause out-of-bounds memory access within the stm32-usphyc PHY driver in the Linux kernel. While the device tree data providing the index is trusted and unlikely to be maliciously crafted, the vulnerability could lead to memory corruption or system instability if triggered. No known exploits in the wild have been reported. The overall impact is considered medium severity due to the limited attack vector and the nature of the flaw.
Mitigation Recommendations
A patch correcting the off-by-one error is available and included in official Ubuntu Linux kernel updates for versions prior to 5.15.0-1105.112~20.04.1 and related builds. Users should apply the latest kernel updates from their distribution repositories and reboot their systems to activate the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No additional mitigation steps are necessary beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71196
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro: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","Ubuntu:25.10"]
Threat ID: 6a5b63a32d1edb114c8b837f
Added to database: 07/18/2026, 11:29:39 UTC
Last enriched: 08/22/2026, 22:01:21 UTC
Last updated: 09/10/2026, 19:24:57 UTC
Views: 7
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