CVE-2024-49936: net/xen-netback: prevent UAF in xenvif_flush_hash()
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net/xen-netback: prevent UAF in xenvif_flush_hash() During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, kfree_rcu does not exist inside the rcu read critical section, so if kfree_rcu is called when the rcu grace period ends during the iteration, UAF occurs when accessing head->next after the entry becomes free. Therefore, to solve this, you need to change it to list_for_each_entry_safe.
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<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49936
- https://nvd.nist.gov/vuln/detail/CVE-2024-49936
- https://launchpad.net/bugs/cve/CVE-2024-49936
- https://security-tracker.debian.org/tracker/CVE-2024-49936
- https://ubuntu.com/security/CVE-2024-49936
- https://git.kernel.org/linus/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12
- https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12
- https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5
- https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb
- https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4
- https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c
- https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e
- https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda
- https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982
Frequently Asked Questions
What is the severity of CVE-2024-49936?
CVE-2024-49936 has a severity rating that could potentially lead to a use-after-free condition in the Linux kernel.
How do I fix CVE-2024-49936?
To address CVE-2024-49936, update your Linux kernel to a version that is patched, specifically versions 6.1.123-1 or later.
Which versions of the Linux kernel are affected by CVE-2024-49936?
CVE-2024-49936 affects several Linux kernel versions including those between 5.10.227 and 6.11.3.
What component of the Linux kernel is affected by CVE-2024-49936?
CVE-2024-49936 impacts the net/xen-netback component, particularly the xenvif_flush_hash function.
Is CVE-2024-49936 a critical vulnerability?
CVE-2024-49936 is considered a critical vulnerability due to its potential to cause serious security issues if exploited.
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