inspektor-gadget up to 0.50.0 include/gadget/buffer.h gadget_reserve_buf omission of security-relevant information

Summaryinfo

A vulnerability was found in inspektor-gadget up to 0.50.0. It has been rated as critical. Affected by this vulnerability is the function gadget_reserve_buf in the library include/gadget/buffer.h. The manipulation leads to omission of security-relevant information. This vulnerability is referenced as CVE-2026-31890. The attack can only be performed from a local environment. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in inspektor-gadget up to 0.50.0 and classified as critical. This issue affects the function gadget_reserve_buf in the library include/gadget/buffer.h. The manipulation with an unknown input leads to a omission of security-relevant information vulnerability. Using CWE to declare the problem leads to CWE-223. The product does not record or display information that would be important for identifying the source or nature of an attack, or determining if an action is safe. Impacted is integrity, and availability. The summary by CVE is:

Inspektor Gadget is a set of tools and framework for data collection and system inspection on Kubernetes clusters and Linux hosts using eBPF. Prior to 0.50.1, in a situation where the ring-buffer of a gadget is – incidentally or maliciously – already full, the gadget will silently drop events. The include/gadget/buffer.h file contains definitions for the Buffer API that gadgets can use to, among the other things, transfer data from eBPF programs to userspace. For hosts running a modern enough Linux kernel (>= 5.8), this transfer mechanism is based on ring-buffers. The size of the ring-buffer for the gadgets is hard-coded to 256KB. When a gadget_reserve_buf fails because of insufficient space, the gadget silently cleans up without producing an alert. The lost count reported by the eBPF operator, when using ring-buffers – the modern choice – is hardcoded to zero. The vulnerability can be used by a malicious event source (e.g. a compromised container) to cause a Denial Of Service, forcing the system to drop events coming from other containers (or the same container). This vulnerability is fixed in 0.50.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-31890 since 03/09/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.50.1 eliminates this vulnerability.

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Productinfo

Name

• inspektor-gadget

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50.0

Website

• Product: https://github.com/inspektor-gadget/inspektor-gadget/

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