CVE-2024-49936
HIGH severity · CVSS 8.8 · Use-after-free
8.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12Patch
- https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5Patch
- https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbbPatch
- https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4Patch
- https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22cPatch
- https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4ePatch
- https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2cecedaPatch
- https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982