Vulnerability Report

CVE-2026-46333

Title: Information disclosure in Linux kernel ptrace

Auth Bypass

Proof Of Concept

PoC Available for CVE-2026-46333

CWE Category NVD-CWE-noinfo

Published Date May 15, 2026

Modified Date May 22, 2026

Exploit Status Available

Score 7.1 CVSS v

Exploit Probability (EPSS)

1.53%

Vulnerability Summary

CVE-2026-46333: In the Linux kernel, the following vulnerability has been resolved: ptrace: slightly saner 'get_dumpable()' logic The 'dumpability' of a task is fundamentally about the memory image of the task - the concept comes from whether it can core dump or not - and makes no sense when you don't have an associated mm. And almost all users do in fact use it only for the case where the task has a mm pointer. But we have one odd special case: ptrace_may_access() uses 'dumpable' to check various other things entirely independently of the MM (typically explicitly using flags like PTRACE_MODE_READ_FSCREDS). Including for threads that no longer have a VM (and maybe never did, like most kernel threads). It's not what this flag was designed for, but it is what it is. The ptrace code does check that the uid/gid matches, so you do have to be uid-0 to see kernel thread details, but this means that the traditional "drop capabilities" model doesn't make any difference for this all. Make it all make a *bit* more sense by saying that if you don't have a MM pointer, we'll use a cached "last dumpability" flag if the thread ever had a MM (it will be zero for kernel threads since it is never set), and require a proper CAP_SYS_PTRACE capability to override.

Impacted Vendors

Analysis in Progress...

Reference Links

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

CVSS v3.1

Source Entity 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Severity HIGH

7.1

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

5.5

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-46333 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/KaraZajac/CHARON

View Code

GitHub https://github.com/0xBlackash/CVE-2026-46333

View Code

GitHub https://github.com/studiogangster/CVE-2026-46333

View Code

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Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.