Answer in brief
CVE-2026-89503 records a High severity (CVSS 7.8) vulnerability in ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bce761d757452ba5eb77e11fecc37a04b67494e7 <2dc510957fe8fd098ab3c3147ebdf34d00cd2734 || >=bce761d757452ba5eb77e11fecc37a04b67494e7 <53106e9262a310ef2c9a9321168c03705940c678 || >=bce761d757452ba5eb77e11fecc37a04b67494e7 <e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 | 2dc510957fe8fd098ab3c3147ebdf34d00cd2734, 53106e9262a310ef2c9a9321168c03705940c678, e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 |
| Linux/Linuxgeneric | >=bce761d757452ba5eb77e11fecc37a04b67494e7 <2313ff69bd237aad264a5913907f374f958335a2 || >=bce761d757452ba5eb77e11fecc37a04b67494e7 <2dc510957fe8fd098ab3c3147ebdf34d00cd2734 || >=bce761d757452ba5eb77e11fecc37a04b67494e7 <53106e9262a310ef2c9a9321168c03705940c678 || >=bce761d757452ba5eb77e11fecc37a04b67494e7 <e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 | 2313ff69bd237aad264a5913907f374f958335a2, 2dc510957fe8fd098ab3c3147ebdf34d00cd2734, 53106e9262a310ef2c9a9321168c03705940c678, e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again. However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory. Use bpage->order for the allocation to prevent this race.
Quoted source text, attributed separately from HOL analysis.