CVE-2023-52445: media: pvrusb2: fix use after free on context disconnection

Severity: high (CVSS 7.8 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: 2024-02-22 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix use after free on context disconnection Upon module load, a kthread is created targeting the pvr2_context_thread_func function, which may call pvr2_context_destroy and thus call kfree() on the context object. However, that might happen before the usb hub_event handler is able to notify the driver. This patch adds a sanity check before the invalid read reported by syzbot, within the context disconnection call stack.

Affected products

Linux kernel: before 4.19.306; from 4.20 before 5.4.268; from 5.5.0 before 5.10.209; from 5.11.0 before 5.15.148; from 5.16.0 before 6.1.75; from 6.2.0 before 6.6.14 — fixed in 4.19.306, 5.10.209, 5.15.148, 5.4.268, 6.1.75, 6.6.14

How to fix

Upgrade to a fixed version: Linux kernel 4.19.306, 5.10.209, 5.15.148, 5.4.268. Check the vendor advisory for mitigations.

References

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