CVE-2023-52439: uio: Fix use-after-free in uio_open

First published: Tue Feb 20 2024(Updated: )

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(&amp;idev-&gt;dev) put_device(&amp;idev-&gt;dev) uio_device_release get_device(&amp;idev-&gt;dev) kfree(idev) uio_free_minor(minor) uio_release put_device(&amp;idev-&gt;dev) kfree(idev) ------------------------------------------------------- In the core-1 uio_unregister_device(), the device_unregister will kfree idev when the idev-&gt;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 &amp; inc idev reference with minor_lock. <a href="https://git.kernel.org/stable/c/0c9ae0b8605078eafc3bea053cc78791e97ba2e2">https://git.kernel.org/stable/c/0c9ae0b8605078eafc3bea053cc78791e97ba2e2</a> <a href="https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea">https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea</a> <a href="https://git.kernel.org/stable/c/3174e0f7de1ba392dc191625da83df02d695b60c">https://git.kernel.org/stable/c/3174e0f7de1ba392dc191625da83df02d695b60c</a> <a href="https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad">https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad</a> <a href="https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7">https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7</a> <a href="https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570">https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570</a> <a href="https://git.kernel.org/stable/c/913205930da6213305616ac539447702eaa85e41">https://git.kernel.org/stable/c/913205930da6213305616ac539447702eaa85e41</a> <a href="https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50">https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50</a>

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• agent/title
• agent/type
• collector/launchpad-cve
• source/Launchpad
• agent/weakness
• agent/author
• agent/first-publish-date
• agent/remedy
• agent/severity
• agent/description
• collector/nvd-api
• source/NVD
• agent/software-canonical-lookup
• collector/nvd-cve
• collector/mitre-cve
• source/MITRE
• agent/event
• agent/references
• collector/redhat-bugzilla
• source/Red Hat
• alias/CVE-2023-52439
• agent/last-modified-date
• collector/usn-cve
• source/Ubuntu
• agent/softwarecombine
• agent/tags
• collector/security-tracker-debian
• source/Debian
• vendor/linux
• canonical/linux linux kernel
• version/linux linux kernel/4.20.0
• version/linux linux kernel/5.5.0
• version/linux linux kernel/5.11.0
• version/linux linux kernel/5.16.0
• version/linux linux kernel/6.2.0
• version/linux linux kernel/6.7.0
• version/linux linux kernel/4.18
• version/linux linux kernel/4.18-rc5
• version/linux linux kernel/4.18-rc6
• version/linux linux kernel/4.18-rc7
• version/linux linux kernel/4.18-rc8
• package-manager/ubuntu
• package-manager/debian