| Name | CVE-2023-52439 |
| Description | In the Linux kernel, the following vulnerability has been resolved: uio: Fix use-after-free in uio_open core-1 core-2 ------------------------------------------------------- uio_unregister_device uio_open idev = idr_find() device_unregister(&idev->dev) put_device(&idev->dev) uio_device_release get_device(&idev->dev) kfree(idev) uio_free_minor(minor) uio_release put_device(&idev->dev) kfree(idev) ------------------------------------------------------- In the core-1 uio_unregister_device(), the device_unregister will kfree idev when the idev->dev kobject ref is 1. But after core-1 device_unregister, put_device and before doing kfree, the core-2 may get_device. Then: 1. After core-1 kfree idev, the core-2 will do use-after-free for idev. 2. When core-2 do uio_release and put_device, the idev will be double freed. To address this issue, we can get idev atomic & inc idev reference with minor_lock. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3840-1, DLA-3841-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.237-1 | fixed | |
| bookworm | 6.1.148-1 | fixed | |
| bookworm (security) | 6.1.147-1 | fixed | |
| trixie | 6.12.43-1 | fixed | |
| trixie (security) | 6.12.41-1 | fixed | |
| forky | 6.16.3-1 | fixed | |
| sid | 6.16.7-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | buster | 4.19.316-1 | DLA-3840-1 | ||
| linux | source | bullseye | 5.10.209-1 | |||
| linux | source | bookworm | 6.1.76-1 | |||
| linux | source | (unstable) | 6.6.13-1 | |||
| linux-5.10 | source | buster | 5.10.209-2~deb10u1 | DLA-3841-1 |
https://git.kernel.org/linus/0c9ae0b8605078eafc3bea053cc78791e97ba2e2 (6.8-rc1)