PT-2026-37393 · Linux · Linux Kernel

Published 2026-05-06 · Updated 2026-06-01 · CVE-2026-43083

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

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

Description An issue exists in the net: ioam6 component where an out-of-bounds access of the dev-> tx[] array can occur when is input is true. This happens because skb get tx queue() does not clamp the index, allowing skb->queue mapping to exceed dev->num tx queues if the ingress device has more RX queues than the egress device has TX queues. Additionally, there is a missing lock around the qdisc qstats qlen backlog() function. Since ioam6 fill trace data() is called from both softirq and process contexts, a spin lock bh() is required to ensure synchronization.

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

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-43083

Affected Products

Linux Kernel

References · 16

• https://ubuntu.com/security/CVE-2026-43083 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43083 · Security Note
• https://git.kernel.org/stable/c/6d1d9ed9b409e0662241e3d245d574a18f643494 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43083 · Vendor Advisory
• https://git.kernel.org/stable/c/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca · Patch
• https://cve.org/CVERecord?id=CVE-2026-43083 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43083 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43083 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43083 · Vendor Advisory
• https://git.kernel.org/stable/c/95a1334748c95dd15546056280ade0c4b8dd7b78 · Patch
• https://docs.bell-sw.com/security/cves/CVE-2026-43083 · Note
• https://reddit.com/r/linux/comments/1ttz0ft/interesting_cves_today · Reddit Post
• https://git.kernel.org/linus/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca · Note
• https://twitter.com/windowsforum/status/2052324144029503721 · Twitter Post
• https://twitter.com/lyrie_ai/status/2054570787340705807 · Twitter Post