CVE-2026-89503ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order.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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from bce761d757452ba5eb77e11fecc37a04b67494e7 before 2313ff69bd237aad264a5913907f374f958335a2; from bce761d757452ba5eb77e11fecc37a04b67494e7 before 2dc510957fe8fd098ab3c3147ebdf34d00cd2734; from bce761d757452ba5eb77e11fecc37a04b67494e7 before 53106e9262a310ef2c9a9321168c03705940c678; from bce761d757452ba5eb77e11fecc37a04b67494e7 before e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 | CNA record |
References
- https://git.kernel.org/stable/c/2313ff69bd237aad264a5913907f374f958335a2
- https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734
- https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678
- https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.