CVE-2024-50127: net: sched: fix use-after-free in taprio_change()
First published: Tue Nov 05 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net: sched: fix use-after-free in taprio_change() In 'taprio_change()', 'admin' pointer may become dangling due to sched switch / removal caused by 'advance_sched()', and critical section protected by 'q->current_entry_lock' is too small to prevent from such a scenario (which causes use-after-free detected by KASAN). Fix this by prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update 'admin' immediately before an attempt to schedule freeing.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.2<5.15.170 | |
| Linux Kernel | >=5.16<6.1.115 | |
| Linux Kernel | >=6.2<6.6.59 | |
| Linux Kernel | >=6.7<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 |
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Reference Links
- https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6
- https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301
- https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61
- https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f
- https://git.kernel.org/stable/c/f504465970aebb2467da548f7c1efbbf36d0f44b
- https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3
- https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f
Frequently Asked Questions
What is the severity of CVE-2024-50127?
CVE-2024-50127 has been classified with a high severity due to the use-after-free vulnerability in the Linux kernel.
How do I fix CVE-2024-50127?
To fix CVE-2024-50127, update your Linux kernel to a version that has patched the vulnerability, specifically versions beyond those specified in the affected software list.
What software is affected by CVE-2024-50127?
CVE-2024-50127 affects multiple versions of the Linux kernel ranging from 5.2 to up to pre-release versions of 6.12 as specified in the vulnerability details.
What impact does CVE-2024-50127 have on systems?
CVE-2024-50127 can lead to potential remote exploitation, system crashes, or execution of arbitrary code due to the use-after-free condition.
Is there any workaround for CVE-2024-50127?
Currently, there are no recommended workarounds for CVE-2024-50127; upgrading to a patched kernel version is the advised course of action.
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