EUVD-2026-76407
GHSA-9677-q555-56wx
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition requires winning a timing window (AC:H); local authenticated access needed (AV:L/PR:L); full kernel impact if race is won (C:H/I:H/A:H).
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
6DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
Because, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page, hold cpu_buffer->lock to prevent races with ring_buffer_alloc_read_page() and ring_buffer_free_read_page().
AnalysisAI
Linux kernel ring-buffer subsystem exposes a race condition between subbuffer resize and page allocation/free operations, enabling local privilege escalation. When ring_buffer_subbuf_order_set() clears cpu_buffer->free_page without holding the cpu_buffer->lock, a concurrent ring_buffer_alloc_read_page() or ring_buffer_free_read_page() call can operate on a stale or freed page, producing kernel memory corruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local authenticated access (PR:L) to a Linux system where the ftrace ring-buffer subsystem is accessible - typically guarded by CAP_PERFMON, CAP_SYS_ADMIN, or equivalent capability, or by /sys/kernel/debug/tracing being world-readable (non-default on hardened distributions). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate despite the 7.8 CVSS score. … 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 | Update to patched kernel releases: Linux 6.12.109, 6.18.50, 7.2.4, or 7.3-rc1. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 24 hours, inventory all Linux systems and confirm patch availability from your Linux distribution vendor. …
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