perf/core: Check kernel access when kernel callchains are requested
perf_event_open() currently gates perf_allow_kernel() only on
!attr.exclude_kernel.
However, users can still request kernel callchain collection with
attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1.
That still requires kernel profiling privilege, but the existing check
does not enforce it.
Update the permission check to call perf_allow_kernel() when either
kernel sampling is requested or kernel callchains are requested.
This keeps permission checks aligned with requested data and prevents
unprivileged use of kernel callchain capture.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
No data available yet.
No solution or workaround provided in the CVE record.
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Tracking
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Fri, 23 Oct 2026 15:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-284 |
Fri, 23 Oct 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: perf/core: Check kernel access when kernel callchains are requested perf_event_open() currently gates perf_allow_kernel() only on !attr.exclude_kernel. However, users can still request kernel callchain collection with attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1. That still requires kernel profiling privilege, but the existing check does not enforce it. Update the permission check to call perf_allow_kernel() when either kernel sampling is requested or kernel callchains are requested. This keeps permission checks aligned with requested data and prevents unprivileged use of kernel callchain capture. | |
| Title | perf/core: Check kernel access when kernel callchains are requested | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-10-23T12:11:53.327Z
Reserved: 2026-09-25T10:25:14.381Z
Link: CVE-2026-98937
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-23T13:17:14.613
Modified: 2026-10-23T13:17:14.613
Link: CVE-2026-98937
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-10-23T14:45:17Z