PT-2026-38992 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-26 · CVE-2026-43341

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/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 ioam6 fill trace data() function where the schema contribution to the trace length is stored in a u8 (an 8-bit unsigned integer). When bit 22 is enabled and the largest schema payload is used, the sclen variable wraps from 256 to 0, bypassing the remaining-space check. Consequently, the ioam6 fill trace data() function positions the write cursor without reserving the necessary schema area but still copies the 4-byte schema header and the full schema payload, leading to a trace buffer overrun.

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

Related Identifiers

CVE-2026-43341

Affected Products

Linux Kernel

References · 18

• https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50 · Patch
• https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f · Patch
• https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43341 · Security Note
• https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280 · Patch
• https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d · Patch
• https://cve.org/CVERecord?id=CVE-2026-43341 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43341 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43341 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43341 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43341 · Vendor Advisory
• https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09 · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-43341 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43341 · Vendor Advisory
• https://twitter.com/CVEnew/status/2052811037443830166 · Twitter Post