Improper access control in Linux kernel - CVE-2026-46333
Published: May 15, 2026
Vulnerability identifier: #VU131583
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46333
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local privileged user to disclose sensitive information.
The vulnerability exists due to improper access control in ptrace_may_access() when checking dumpability for tasks without an associated mm pointer. A local privileged user can inspect kernel thread details to disclose sensitive information.
The issue affects cases involving threads that no longer have a VM or never had one, such as kernel threads.
How to mitigate CVE-2026-46333
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/01363cb3fbd0238ffdeb09f53e9039c9edf8a730
- https://git.kernel.org/stable/c/15b828a46f305ae9f05a7c16914b3ce273474205
- https://git.kernel.org/stable/c/2a93a4fac7b6051d3be7cd1b015fe7320cd0404d
- https://git.kernel.org/stable/c/4709234fd1b95136ceb789f639b1e7ea5de1b181
- https://git.kernel.org/stable/c/6e5b51e74a40d377bcd3081dd33fbaa0e1aa7e3d
- https://git.kernel.org/stable/c/8f907d345bae8f4b3f004c5abc56bf2dfb851ea7
- https://git.kernel.org/stable/c/93d4ba49d18e3d7fb41a9927c2d0cca5e9dfefd6