PT-2026-39027 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43366

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the io uring/kbuf component where a gap occurs between grabbing a buffer and its potential recycling. If the buffer list is empty, it may be upgraded to a ring-provided type, particularly when requests are forced via io-wq. The legacy recycling process fails to verify if the buffer list still exists and if it is of the correct type.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43366

Affected Products

Linux Kernel

References · 17

• https://nvd.nist.gov/vuln/detail/CVE-2026-43366 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-43366 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43366 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43366 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43366 · Security Note
• https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43366 · Vendor Advisory
• https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f · Patch
• https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c · Patch
• https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f · Patch
• https://git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa · Patch
• https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43366 · Vendor Advisory
• https://docs.bell-sw.com/security/cves/CVE-2026-43366 · Note
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post