CVE-2026-89503ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order.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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected bce761d757452ba5eb77e11fecc37a04b67494e7 – < 2313ff69bd237aad264a5913907f374f958335a2
- affected bce761d757452ba5eb77e11fecc37a04b67494e7 – < 2dc510957fe8fd098ab3c3147ebdf34d00cd2734
- affected bce761d757452ba5eb77e11fecc37a04b67494e7 – < 53106e9262a310ef2c9a9321168c03705940c678
- affected bce761d757452ba5eb77e11fecc37a04b67494e7 – < e743527c5bfdceda1095bc0a9e596e2aebb6a9c3
- affected 6.8
- unaffected < 6.8
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/2313ff69bd237aad264a5913907f374f958335a2 (opens in a new tab)
- https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734 (opens in a new tab)
- https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678 (opens in a new tab)
- https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76409 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89503)Record last updated .