Double Free Affecting kernel-rt-debug-core package, versions <0:5.14.0-427.37.1.el9_4
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Test your applications- Snyk ID SNYK-ALMALINUX9-KERNELRTDEBUGCORE-8324173
- published 4 Nov 2024
- disclosed 24 Sep 2024
Introduced: 24 Sep 2024
CVE-2023-52439 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 kernel-rt-debug-core to version 0:5.14.0-427.37.1.el9_4 or higher.
This issue was patched in ALSA-2024:6997.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-core package and not the kernel-rt-debug-core package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 relevant fixed versions and status.
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:
- After core-1 kfree idev, the core-2 will do use-after-free for idev.
- 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.
References
- https://errata.almalinux.org/8/ALSA-2024-3618.html
- https://errata.almalinux.org/8/ALSA-2024-3627.html
- https://errata.almalinux.org/9/ALSA-2024-6997.html
- https://access.redhat.com/security/cve/CVE-2023-52439
- https://access.redhat.com/errata/RHSA-2024:3618
- https://access.redhat.com/errata/RHSA-2024:3627
- https://access.redhat.com/errata/RHSA-2024:6997
- https://git.kernel.org/stable/c/0c9ae0b8605078eafc3bea053cc78791e97ba2e2
- https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea
- https://git.kernel.org/stable/c/3174e0f7de1ba392dc191625da83df02d695b60c
- https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad
- https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7
- https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570
- https://git.kernel.org/stable/c/913205930da6213305616ac539447702eaa85e41
- https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html