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CVE-2024-49936— net/xen-netback: prevent UAF in xenvif_flush_hash()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/xen-netback子系统xenvif_flush_hash函数中的释放后重用问题。

CVSS 8.8 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 40d8abdee806d496a60ee607a6d01b1cd7fabaf0< 3c4423b0c4b98213b3438e15061e1d08220e6982 affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< a0465723b8581cad27164c9073fd780904cd22d4 affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< efcff6ce7467f01f0753609f420333f3f2ceceda affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< 143edf098b80669d05245b2f2367dd156a83a2c5 affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< d408889d4b54f5501e4becc4dbbb9065143fbf4e affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< 54d8639af5568fc41c0e274fc3ec9cf86c59fcbb affected
40d8abdee806d496a60ee607a6d01b1cd7fabaf0< 0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 affected
… +10 more rows
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I. Basic Information for CVE-2024-49936

Vulnerability Information
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Vulnerability Title
net/xen-netback: prevent UAF in xenvif_flush_hash()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/xen-netback子系统xenvif_flush_hash函数中的释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 ~ 3c4423b0c4b98213b3438e15061e1d08220e6982 -
Linux Linux 4.7 -

II. Public POCs for CVE-2024-49936

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III. Intelligence Information for CVE-2024-49936

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Patches & Fixes for CVE-2024-49936 (8)

Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total

CVE-2024-47695 9.8 CRITICAL RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds
CVE-2022-48985 9.8 CRITICAL net: mana: Fix race on per-CQ variable napi work_done
CVE-2024-50033 9.8 CRITICAL slip: make slhc_remember() more robust against malicious packets
CVE-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
CVE-2024-50043 9.8 CRITICAL nfsd: fix possible badness in FREE_STATEID
CVE-2024-49855 9.8 CRITICAL nbd: fix race between timeout and normal completion
CVE-2024-50047 9.8 CRITICAL smb: client: fix UAF in async decryption
CVE-2024-50046 9.8 CRITICAL NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()
CVE-2024-49996 9.4 CRITICAL cifs: Fix buffer overflow when parsing NFS reparse points
CVE-2024-47678 9.4 CRITICAL icmp: change the order of rate limits
CVE-2022-48960 8.8 HIGH net: hisilicon: Fix potential use-after-free in hix5hd2_rx()
CVE-2024-50029 8.8 HIGH Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-49939 8.8 HIGH wifi: rtw89: avoid to add interface to list twice when SER
CVE-2022-49017 8.8 HIGH tipc: re-fetch skb cb after tipc_msg_validate
CVE-2022-48962 8.8 HIGH net: hisilicon: Fix potential use-after-free in hisi_femac_rx()
CVE-2022-49015 8.8 HIGH net: hsr: Fix potential use-after-free
CVE-2022-48964 8.8 HIGH ravb: Fix potential use-after-free in ravb_rx_gbeth()
CVE-2022-48967 8.8 HIGH NFC: nci: Bounds check struct nfc_target arrays
CVE-2024-49930 8.8 HIGH wifi: ath11k: fix array out-of-bound access in SoC stats
CVE-2024-49950 8.8 HIGH Bluetooth: L2CAP: Fix uaf in l2cap_connect

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-49936

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