PT-2026-39049 · Linux · Linux Kernel

CVE-2026-43388 · Published 2026-05-08 · Updated 2026-05-21

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 damos walk() function where ctx->walk control is set to a caller-provided control structure before verifying if the context is running. If the context is inactive, the function returns an error without clearing ctx->walk control, leaving a dangling pointer to a stack-allocated structure. This can lead to a use-after-free scenario if the context is started and kdamond dereferences the pointer, or result in a permanent -EBUSY error during subsequent damos walk() calls because the pointer remains non-NULL.

Recommendations Clear ctx->walk control under walk control lock before returning -EINVAL in the damos walk() function.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-43388

Affected Products

Linux Kernel

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43388.json · Exploit
• https://cve.org/CVERecord?id=CVE-2026-43388 · Security Note
• https://ubuntu.com/security/CVE-2026-43388 · Vendor Advisory
• https://git.kernel.org/stable/c/9320c77134ab8d7701e20608bbf08517df4fa321 · Patch
• https://git.kernel.org/stable/c/ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b · Patch
• https://git.kernel.org/stable/c/d210fdcac9c0d1380eab448aebc93f602c1cd4e6 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43388 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-43388 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43388 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43388 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43388 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43388 · Vendor Advisory
• https://docs.bell-sw.com/security/cves/CVE-2026-43388 · Note
• https://git.kernel.org/linus/d210fdcac9c0d1380eab448aebc93f602c1cd4e6 · Note
• https://twitter.com/infoflowcloud/status/2052769664313237512 · Twitter Post