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Vulnerability record · CVE-2026-43366 · published 8 May 2026

CVE-2026-43366: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6%
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f Patch
https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83 Patch
https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4 Patch
https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c Patch
https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f Patch
https://git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43366), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.