7.8

CVE-2024-49936

net/xen-netback: prevent UAF in xenvif_flush_hash()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 5.10.227
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.168
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.113
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.55
Linux ≫ Linux Kernel Version >= 6.7 < 6.10.14
Linux ≫ Linux Kernel Version >= 6.11 < 6.11.3
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.27% 0.188
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12
Patch
https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5
Patch
https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982
https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb
Patch
https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4
Patch
https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c
Patch
https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e
Patch
https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda
Patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html