CVE-2026-89502Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's ring-buffer component. When sub-buffers are configured with a specific memory allocation order greater than zero, the system attempts to free a memory page using an incorrect size. This memory managem…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.4
none → medium
— → 4.4
none → medium
— → 4.4
none → medium
Last analysed / modified upstream
4.4 → 5.5
A flaw was found in the Linux kernel's ring-buffer component. When sub-buffers are configured with a specific memory allocation order greater than zero, the system attempts to free a memory page using an incorrect size. This memory management error can lead to memory corruption, potentially allowing a local attacker to escalate privileges or cause a system crash (Denial of Service).
kernel: ring-buffer: Free cpu_buffer::free_page with subbuf_order — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-16.
Affected:
No fix planned:
Not affected:
Fix deferred
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-89500High· 7.0kernel: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page (CVE-2026-89500)
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CVE-2026-89501High· 7.0kernel: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf (CVE-2026-89501)
CVE-2026-89503Medium· 5.5kernel: ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() (CVE-2026-89503)
CVE-2026-89521Medium· 5.5kernel: sched/core: Handle pick_task() releasing the rq lock (CVE-2026-89521)