In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments… (CVE-2026-90358)
A vulnerability in the Linux kernel related to the BPF x86 trampoline stack size for 128-bit arguments has been resolved. The issue involved under-allocation of the register save area when handling 128-bit scalar arguments, causing stack slots to be overwritten. This flaw could lead to high impact on confidentiality, integrity, and availability.
AI Analysis
Technical Summary
The Linux kernel's bpf x86 trampoline implementation incorrectly calculated the stack size for 128-bit arguments such as __int128. The function btf_distill_func_proto() accepts function arguments up to 16 bytes, but the existing code assumed only one register was needed for __int128 arguments. This caused under-allocation of the register save area, leading to save_args() overwriting adjacent stack slots. The vulnerability was fixed by computing the register count from the argument size for all arguments, preventing stack corruption.
Potential Impact
This vulnerability allows overwriting of adjacent stack slots due to under-allocated register save area for 128-bit arguments in the BPF x86 trampoline. The CVSS score of 7.8 indicates a high severity with potential to impact confidentiality, integrity, and availability of the system. Exploitation requires local access (AV:L) with low complexity and privileges, but no user interaction is needed.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to correctly compute the register count from argument size, preventing stack corruption. Users should apply the official kernel update that includes this patch. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments… (CVE-2026-90358)
Description
A vulnerability in the Linux kernel related to the BPF x86 trampoline stack size for 128-bit arguments has been resolved. The issue involved under-allocation of the register save area when handling 128-bit scalar arguments, causing stack slots to be overwritten. This flaw could lead to high impact on confidentiality, integrity, and availability.
CVSS v3.1
Score 7.8high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's bpf x86 trampoline implementation incorrectly calculated the stack size for 128-bit arguments such as __int128. The function btf_distill_func_proto() accepts function arguments up to 16 bytes, but the existing code assumed only one register was needed for __int128 arguments. This caused under-allocation of the register save area, leading to save_args() overwriting adjacent stack slots. The vulnerability was fixed by computing the register count from the argument size for all arguments, preventing stack corruption.
Potential Impact
This vulnerability allows overwriting of adjacent stack slots due to under-allocated register save area for 128-bit arguments in the BPF x86 trampoline. The CVSS score of 7.8 indicates a high severity with potential to impact confidentiality, integrity, and availability of the system. Exploitation requires local access (AV:L) with low complexity and privileges, but no user interaction is needed.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to correctly compute the register count from argument size, preventing stack corruption. Users should apply the official kernel update that includes this patch. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4c82-vpvx-8vw4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-90358"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aade51e55bf5e2cf5edc164
Added to database: 09/19/2026, 01:27:58 UTC
Last enriched: 09/19/2026, 01:47:59 UTC
Last updated: 09/19/2026, 01:47:59 UTC
Views: 2
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