net/xen-netback: prevent UAF in xenvif_flush_hash()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.3%
exploitation probability
0.3%top 82% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbbhttps://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22chttps://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4ehttps://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2cecedahttps://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlhttps://lists.debian.org/debian-lts-announce/2025/03/msg00002.html