PT-2026-42453 · Linux · Linux Kernel

Published 2026-05-21 · Updated 2026-05-25 · CVE-2026-43496

Positive Technologies (AI Summary)

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

Description A kernel panic can occur in the Linux kernel when a Random Early Detection (RED) queueing discipline (qdisc) has children, such as a Fair Queueing (FQ) qdisc, whose peek() callback is qdisc peek dequeued(). The issue arises when a parent qdisc attempts to retrieve a socket buffer (skb) from its child. After a successful peek() operation, the subsequent dequeue() call on the RED qdisc triggers a null-pointer dereference in the qfq dequeue() function because it attempts to grab a packet from the queue instead of retrieving the already peeked gso skb queue packet.

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

Related Identifiers

CVE-2026-43496

ECHO-44BA-D76C-2090

OPENSUSE-SU-2026:10859-1

Affected Products

Linux Kernel

References · 30

• https://nvd.nist.gov/vuln/detail/CVE-2026-43496 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43496 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10859-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43496 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43496 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43496 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43496 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43496 · Vendor Advisory
• https://git.kernel.org/stable/c/8d09618840b99ef00154d3e731ce9b11e096196d · Note
• https://git.kernel.org/stable/c/c7335f4dc0fa21f7015b910c6fc2f4d599732328 · Note
• https://git.kernel.org/stable/c/ce051eede433f876d322ac3550a36a3c6fc4c231 · Note
• https://git.kernel.org/stable/c/36aa34f42cb6842cf371f3a2d3e855d24fd57a50 · Note
• https://git.kernel.org/linus/458d5615272d3de535748342eb68ca492343048c · Note
• https://suse.com/security/cve/CVE-2026-43502 · Note
• https://suse.com/security/cve/CVE-2026-43493 · Note