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7.8
Linux Kernel: Use-After-Free in Taprio Change
published 1 year ago
Summary
A vulnerability in the Linux kernel's network scheduling system could cause data corruption or crashes. This issue affects systems running Linux and can be fixed with a software update. Users should apply the latest kernel patch or upgrade to a fixed version to prevent potential problems.
What to do
- Update linux kernel to version 6.11.6.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Linux | linux | kernel |
>= 6.7.0, < 6.11.6 Fix: upgrade to 6.11.6
|
Original advisory text
net: sched: fix use-after-free in taprio_change()
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.
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.
References
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html URL
- https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61 URL
- https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f URL
- https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3 URL
- https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f URL
- https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6 URL
- https://git.kernel.org/stable/c/f504465970aebb2467da548f7c1efbbf36d0f44b URL
- https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301 URL
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html URL
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50127... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2024-50127 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published5 Nov 2024
Updated5 Aug 2026
First seen5 Aug 2026
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