CVE-2026-89503
ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order.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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2026 |
| Last Updated | Sep 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
bce761d757452ba5eb77e11fecc37a04b67494e7 < 2dc510957fe8fd098ab3c3147ebdf34d00cd2734 bce761d757452ba5eb77e11fecc37a04b67494e7 < 53106e9262a310ef2c9a9321168c03705940c678 bce761d757452ba5eb77e11fecc37a04b67494e7 < e743527c5bfdceda1095bc0a9e596e2aebb6a9c3
Linux / Linux
6.8