EUVD-2026-76406
GHSA-h78f-r23h-v8hg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition requires precise concurrent timing (AC:H); local access and low-priv tracing access confirmed; kernel memory corruption supports C:H/I:H/A:H.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
Discarding a cached reader page after a concurrent ring buffer resize uses the new global subbuf_order for the free_pages() call. This mismatched order may crashes the kernel or leaks memory because the cached page was allocated under the old size.
Save the actual free_page order alongside the page address to ensure we always refer to the correct value and do not rely on the potentially stalled cpu_buffer->subbuf_order value. The simplest is to make free_page a buffer_data_read_page which already covers exactly what we need: a page address and a page order.
AnalysisAI
Memory management order mismatch in the Linux kernel ring-buffer tracing subsystem allows a local low-privileged user to corrupt kernel memory or crash the system by triggering a ring buffer resize concurrently with cached reader page discard. The root cause is that cpu_buffer::free_page stores only a page address without preserving the allocation order; after a resize changes cpu_buffer->subbuf_order, free_pages() is invoked with the new order rather than the original, corrupting the buddy allocator's state. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a local user account with sufficient privilege to access the kernel tracing ring buffer - typically CAP_SYS_ADMIN or a system with tracefs/debugfs accessible to lower-privileged users (the CVSS PR:L suggests exploitation is possible without full root). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) captures the theoretical worst-case: a local low-privileged user corrupting kernel buddy allocator state to achieve privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Linux 6.18.51, 7.2.4, or 7.3-rc1, which include the upstream fix that replaces the bare free_page pointer with a buffer_data_read_page structure preserving allocation order. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Linux systems running kernel versions earlier than 6.18.51, 7.2.4, or 7.3-rc1, prioritizing production servers, development systems with user access, and shared infrastructure. …
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Same technique Denial Of Service
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External POC / Exploit Code
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