CVE-2024-44996
Description
A vulnerability was found in the Linux kernel related to vsock, involving recursive calls due to BPF sockmap integration. When a vsock socket was added to a BPF sockmap, the prot->recvmsg function was replaced with vsock_bpf_recvmsg(). This could lead to recursion as vsock_bpf_recvmsg() called __vsock_recvmsg(), which then invokes vsock_connectible_recvmsg(), leading back to vsock_bpf_recvmsg().
Statement
This issue is classified as moderate severity rather than important because the recursive vulnerability in vsock primarily affects the handling of sockets within a specific context involving BPF sockmap integration. While it could lead to stack overflow and potential denial of service under certain conditions, it does not inherently allow for privilege escalation or arbitrary code execution. The recursion is constrained to the vsock_bpf_recvmsg() and __vsock_recvmsg() functions, and effective mitigation can be achieved by bypassing BPF logic when recursion is detected.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
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