CVE-2024-49936

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < 3c4423b0c4b98213b3438e15061e1d08220e6982affected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22caffected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < a0465723b8581cad27164c9073fd780904cd22d4affected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < efcff6ce7467f01f0753609f420333f3f2cecedaaffected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < 143edf098b80669d05245b2f2367dd156a83a2c5affected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < d408889d4b54f5501e4becc4dbbb9065143fbf4eaffected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < 54d8639af5568fc41c0e274fc3ec9cf86c59fcbbaffected
LinuxLinux40d8abdee806d496a60ee607a6d01b1cd7fabaf0 < 0fa5e94a1811d68fbffa0725efe6d4ca62c03d12affected
LinuxLinux4.7affected
LinuxLinux0 < 4.7unaffected
LinuxLinux5.4.290 <= 5.4.*unaffected
LinuxLinux5.10.227 <= 5.10.*unaffected
LinuxLinux5.15.168 <= 5.15.*unaffected
LinuxLinux6.1.113 <= 6.1.*unaffected
LinuxLinux6.6.55 <= 6.6.*unaffected
LinuxLinux6.10.14 <= 6.10.*unaffected
LinuxLinux6.11.3 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References