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CVE-2026-90358

HIGHCVSS 7.8/10

Last modified

CVE-2026-90358 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots. Compute the register count from arg_size for all arguments to fix it..

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots. Compute the register count from arg_size for all arguments to fix it.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 4aed2346fa9b88d458eeb8c01123f3c07585a675; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 40f3bfbbb222b92278f3797614b70f68d46824ac; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < a6d7d7a253c550e74b0651897fe313c2f9b2301f; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 814cba835ef648e0c5eb79505c96c0493b29eea6
LinuxLinux6.1

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90358?
In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots. Compute the register count from arg_size for all arguments to fix it.
How severe is CVE-2026-90358?
CVE-2026-90358 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-90358?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST