CVE-2026-89771Medium· 5.5▾ SunlitA flaw was found in the Linux kernel. A race condition exists in the ring buffer resizing mechanism, where `trace_buffer subbuf_size` can be read without proper locking while it is being simultaneously resized. This could allow a local att…
▾ 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%
— → 4.7
— → 4.7
none → medium
— → 7.8
none → high
7.8 → 4.7
high → medium
4.7 → 7.8
medium → high
7.8 → 4.7
high → medium
Last analysed / modified upstream
4.7 → 5.5
A flaw was found in the Linux kernel. A race condition exists in the ring buffer resizing mechanism, where trace_buffer subbuf_size can be read without proper locking while it is being simultaneously resized. This could allow a local attacker to trigger unpredictable behavior or a denial of service (DoS) by causing system instability.
kernel: ring-buffer: Fix subbuf resize race with ring buffer readers — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
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.
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