CVE-2024-50127: linux kernel Use-After-Free — Fix

Description

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.2 — 5.15.170
linux	linux_kernel	5.16 — 6.1.115
linux	linux_kernel	6.2 — 6.6.59
linux	linux_kernel	6.7 — 6.11.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61 https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3 https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6 https://git.kernel.org/stable/c/f504465970aebb2467da548f7c1efbbf36d0f44b https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Frequently Asked Questions

What is CVE-2024-50127? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-50127? +

CVE-2024-50127 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-50127? +

CVE-2024-50127 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-50127? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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