CVE-2022-48757: net: fix information leakage in /proc/net/ptype

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-20 · updated 2026-06-17
Weakness: CWE-668

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix information leakage in /proc/net/ptype In one net namespace, after creating a packet socket without binding it to a device, users in other net namespaces can observe the new `packet_type` added by this packet socket by reading `/proc/net/ptype` file. This is minor information leakage as packet socket is namespace aware. Add a net pointer in `packet_type` to keep the net namespace of of corresponding packet socket. In `ptype_seq_show`, this net pointer must be checked when it is not NULL.

Affected products

Linux kernel: from 2.6.26 before 4.4.302; from 4.5 before 4.9.300; from 4.10 before 4.14.265; from 4.15 before 4.19.228; from 4.20 before 5.4.176; from 5.5 before 5.10.96 — fixed in 4.14.265, 4.19.228, 4.4.302, 4.9.300, 5.10.96, 5.15.19

How to fix

Upgrade to a fixed version: Linux kernel 4.14.265, 4.19.228, 4.4.302, 4.9.300. Check the vendor advisory for mitigations.

References

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