In the Linux kernel, the following vulnerability has been resolved: riscv: Sanitize syscall table indexing under speculation The syscall number is a… (CVE-2025-71203)
A vulnerability in the Linux kernel affecting the RISC-V architecture has been resolved. The issue involved improper sanitization of syscall table indexing under speculative execution, where a user-controlled syscall number could lead to speculative out-of-bounds access and potential data leakage via cache side channels. This vulnerability is part of a broader set of security fixes addressing multiple architectures and subsystems in the Linux kernel. The vulnerability has a CVSS score of 7.0 and is rated medium severity. Patches are available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later.
AI Analysis
Technical Summary
CVE-2025-71203 addresses a vulnerability in the Linux kernel's RISC-V architecture where the syscall number, a user-controlled value, was used to index the syscall table without proper sanitization under speculative execution. This could allow speculative out-of-bounds access leading to data leakage through cache side channels. The fix involves using array_index_nospec() to clamp the syscall number after bounds checking, preventing speculative execution from accessing out-of-bounds memory. This vulnerability is part of a comprehensive set of Linux kernel security updates that fix multiple issues across various architectures and subsystems. The vulnerability has a CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a medium severity with high impact on confidentiality, integrity, and availability but requiring local access with high attack complexity and low privileges.
Potential Impact
If exploited, this vulnerability could allow a local attacker with low privileges to cause speculative execution to access out-of-bounds syscall table entries, potentially leaking sensitive information via cache side channels. The impact includes high confidentiality, integrity, and availability consequences. However, exploitation requires local access and has high attack complexity.
Mitigation Recommendations
A patch addressing this vulnerability is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to these or later versions and reboot the system to apply the fixes. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow vendor instructions for updating and rebuilding kernel modules as needed.
In the Linux kernel, the following vulnerability has been resolved: riscv: Sanitize syscall table indexing under speculation The syscall number is a… (CVE-2025-71203)
Description
A vulnerability in the Linux kernel affecting the RISC-V architecture has been resolved. The issue involved improper sanitization of syscall table indexing under speculative execution, where a user-controlled syscall number could lead to speculative out-of-bounds access and potential data leakage via cache side channels. This vulnerability is part of a broader set of security fixes addressing multiple architectures and subsystems in the Linux kernel. The vulnerability has a CVSS score of 7.0 and is rated medium severity. Patches are available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later.
CVSS v3.1
Score 7.0high
Affected software
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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=questingpkg:deb/ubuntu/[email 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
CVE-2025-71203 addresses a vulnerability in the Linux kernel's RISC-V architecture where the syscall number, a user-controlled value, was used to index the syscall table without proper sanitization under speculative execution. This could allow speculative out-of-bounds access leading to data leakage through cache side channels. The fix involves using array_index_nospec() to clamp the syscall number after bounds checking, preventing speculative execution from accessing out-of-bounds memory. This vulnerability is part of a comprehensive set of Linux kernel security updates that fix multiple issues across various architectures and subsystems. The vulnerability has a CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a medium severity with high impact on confidentiality, integrity, and availability but requiring local access with high attack complexity and low privileges.
Potential Impact
If exploited, this vulnerability could allow a local attacker with low privileges to cause speculative execution to access out-of-bounds syscall table entries, potentially leaking sensitive information via cache side channels. The impact includes high confidentiality, integrity, and availability consequences. However, exploitation requires local access and has high attack complexity.
Mitigation Recommendations
A patch addressing this vulnerability is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to these or later versions and reboot the system to apply the fixes. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow vendor instructions for updating and rebuilding kernel modules as needed.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71203
- 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","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b639c2d1edb114c8b7b44
Added to database: 07/18/2026, 11:29:32 UTC
Last enriched: 08/01/2026, 23:34:44 UTC
Last updated: 09/10/2026, 19:24:57 UTC
Views: 6
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