CVE-2024-50059: ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition In the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev function, then &sndev->check_link_status_work is bound with check_link_status_work. switchtec_ntb_link_notification may be called to start the work. If we remove the module which will call switchtec_ntb_remove to make cleanup, it will free sndev through kfree(sndev), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | check_link_status_work switchtec_ntb_remove | kfree(sndev); | | if (sndev->link_force_down) | // use sndev Fix it by ensuring that the work is canceled before proceeding with the cleanup in switchtec_ntb_remove.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <5.10.227 | |
| Linux kernel | >=5.11<5.15.168 | |
| Linux kernel | >=5.16<6.1.113 | |
| Linux kernel | >=6.2<6.6.57 | |
| Linux kernel | >=6.7<6.11.4 | |
| Linux Kernel | <5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.57 | |
| Linux Kernel | >=6.7<6.11.4 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/177925d9c8715a897bb79eca62628862213ba956
- https://git.kernel.org/stable/c/3ae45be8492460a35b5aebf6acac1f1d32708946
- https://git.kernel.org/stable/c/5126d8f5567f49b52e21fca320eaa97977055099
- https://git.kernel.org/stable/c/92728fceefdaa2a0a3aae675f86193b006eeaa43
- https://git.kernel.org/stable/c/b650189687822b705711f0567a65a164a314d8df
- https://git.kernel.org/stable/c/e51aded92d42784313ba16c12f4f88cc4f973bbb
- https://git.kernel.org/stable/c/fa840ba4bd9f3bad7f104e5b32028ee73af8b3dd
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50059
- https://nvd.nist.gov/vuln/detail/CVE-2024-50059
- https://launchpad.net/bugs/cve/CVE-2024-50059
- https://security-tracker.debian.org/tracker/CVE-2024-50059
- https://ubuntu.com/security/CVE-2024-50059
- https://git.kernel.org/linus/e51aded92d42784313ba16c12f4f88cc4f973bbb
Frequently Asked Questions
What is the severity of CVE-2024-50059?
The severity of CVE-2024-50059 is considered high due to the potential for a use-after-free vulnerability leading to system instability or exploitation.
How do I fix CVE-2024-50059?
To fix CVE-2024-50059, you should update to a patched version of the Linux kernel, specifically versions 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.15-1.
Which versions of the Linux kernel are affected by CVE-2024-50059?
CVE-2024-50059 affects Linux kernel versions from 5.10.0 up to 6.11.4, excluding later patches.
What is a use-after-free vulnerability as seen in CVE-2024-50059?
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially leading to crashes or arbitrary code execution.
Is CVE-2024-50059 specific to certain Linux distributions?
CVE-2024-50059 impacts the Linux kernel across various distributions that use affected versions, not being limited to a specific distribution.
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