PT-2026-36438 · Linux · Linux Kernel

Published 2026-03-25 · Updated 2026-05-08 · CVE-2026-43021

Positive Technologies (AI Summary)

CVSS v2.0

6.2

Medium

Base vector

AV:L/AC:L/Au:S/C:C/I:N/A:C

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

Description A memory leak occurs in the Bluetooth component when the hci cmd sync queue once() function returns an error. In such cases, the destroy callback is not triggered, leading to leaking references and memory.

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

Memory Leak

Missing Release of Resource after Effective Lifetime

Weakness Enumeration

CWE-401

CWE-772

Related Identifiers

BDU:2026-06502

CVE-2026-43021

Affected Products

Linux Kernel

References · 14

• https://cve.org/CVERecord?id=CVE-2026-43021 · Security Note
• https://bdu.fstec.ru/vul/2026-06502 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43021 · Vendor Advisory
• https://git.kernel.org/stable/c/7fd74178d4b16dcf47179da634ea9d7c02e3608b · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43021 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43021 · Vendor Advisory
• https://git.kernel.org/stable/c/aca377208e7f7322bf4e107cdec6e7d7e8aa7a88 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43021 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43021 · Vendor Advisory
• https://access.redhat.com/security/cve/cve-2026-43021 · Note
• https://lore.kernel.org/linux-cve-announce/2026050158-CVE-2026-43021-ed82@gregkh · Note
• https://git.kernel.org/linus/aca377208e7f7322bf4e107cdec6e7d7e8aa7a88 · Note
• https://t.me/cveNotify/162716 · Telegram Post
• https://feedly.com/cve/CVE-2026-43021 · Note