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CVE-2025-39823— KVM: x86: use array_index_nospec with indices that come from guest

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，该漏洞源于未对来自客户端的索引使用array_index_nospec，可能导致推测执行侧信道攻击。

AI Predicted 6.5 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1570 · Lateral Tool Transfer

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4180bf1b655a791a0a6ef93a2ffffc762722c782< 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48 affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< 31a0ad2f60cb4816e06218b63e695eb72ce74974 affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< d51e381beed5e2f50f85f49f6c90e023754efa12 affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< f49161646e03d107ce81a99c6ca5da682fe5fb69 affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< 67a05679621b7f721bdba37a5d18665d3aceb695 affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< f57a4bd8d6cb5af05b8ac1be9098e249034639fb affected
4180bf1b655a791a0a6ef93a2ffffc762722c782< c87bd4dd43a624109c3cc42d843138378a7f4548 affected
… +10 more rows
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I. Basic Information for CVE-2025-39823

Vulnerability Information
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Vulnerability Title
KVM: x86: use array_index_nospec with indices that come from guest
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于未对来自客户端的索引使用array_index_nospec，可能导致推测执行侧信道攻击。
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 4180bf1b655a791a0a6ef93a2ffffc762722c782 ~ 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48 -
Linux Linux 4.19 -

II. Public POCs for CVE-2025-39823

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III. Intelligence Information for CVE-2025-39823

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Same Patch Batch · Linux · 2025-09-16 · 115 CVEs total

CVE-2022-50350 9.8 CRITICAL scsi: target: iscsi: Fix a race condition between login_work and the login thread
CVE-2025-39806 8.8 HIGH HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()
CVE-2023-53305 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free
CVE-2023-53297 8.8 HIGH Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp
CVE-2025-39827 8.8 HIGH net: rose: include node references in rose_neigh refcount
CVE-2025-39826 8.8 HIGH net: rose: convert 'use' field to refcount_t
CVE-2023-53315 8.8 HIGH wifi: ath11k: Fix SKB corruption in REO destination ring
CVE-2023-53322 8.8 HIGH scsi: qla2xxx: Wait for io return on terminate rport
CVE-2025-39809 8.4 HIGH HID: intel-thc-hid: intel-quicki2c: Fix ACPI dsd ICRS/ISUB length
CVE-2023-53333 8.2 HIGH netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one
CVE-2025-39818 7.8 HIGH HID: intel-thc-hid: intel-thc: Fix incorrect pointer arithmetic in I2C regs save
CVE-2025-39810 7.8 HIGH bnxt_en: Fix memory corruption when FW resources change during ifdown
CVE-2023-53311 7.8 HIGH nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
CVE-2023-53314 7.8 HIGH fbdev/ep93xx-fb: Do not assign to struct fb_info.dev
CVE-2025-39815 7.8 HIGH RISC-V: KVM: fix stack overrun when loading vlenb
CVE-2023-53286 7.8 HIGH RDMA/mlx5: Return the firmware result upon destroying QP/RQ
CVE-2022-50341 7.8 HIGH cifs: fix oops during encryption
CVE-2025-39821 7.8 HIGH perf: Avoid undefined behavior from stopping/starting inactive events
CVE-2023-53274 7.8 HIGH clk: mediatek: mt8183: Add back SSPM related clocks
CVE-2023-53263 7.8 HIGH drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create

Showing top 20 of 115 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39823

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