bpf, x86: Fix trampoline stack size for 128-bit arguments

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90358
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:34 UTC
Updated2026-09-18 18:17:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002000000 probability, percentile 0.102000000 (date 2026-09-18)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 4aed2346fa9b88d458eeb8c01123f3c07585a675 git Not specified
CNA Linux Linux affected a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 40f3bfbbb222b92278f3797614b70f68d46824ac git Not specified
CNA Linux Linux affected a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 a6d7d7a253c550e74b0651897fe313c2f9b2301f git Not specified
CNA Linux Linux affected a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 814cba835ef648e0c5eb79505c96c0493b29eea6 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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