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CVE-2025-39815— RISC-V: KVM: fix stack overrun when loading vlenb

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，该漏洞源于未检查vlenb加载大小，可能导致栈缓冲区溢出。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 2fa290372dfe7dd248b1c16f943f273a3e674f22< c76bf8359188a11f8fd790e5bbd6077894a245cc affected
2fa290372dfe7dd248b1c16f943f273a3e674f22< 6d28659b692a0212f360f8bd8a58712b339f9aac affected
2fa290372dfe7dd248b1c16f943f273a3e674f22< 799766208f09f95677a9ab111b93872d414fbad7 affected
6.8 affected
< 6.8 unaffected
6.12.45≤ 6.12.* unaffected
6.16.5≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39815

Vulnerability Information
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Vulnerability Title
RISC-V: KVM: fix stack overrun when loading vlenb
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: fix stack overrun when loading vlenb The userspace load can put up to 2048 bits into an xlen bit stack buffer. We want only xlen bits, so check the size beforehand.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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，该漏洞源于未检查vlenb加载大小，可能导致栈缓冲区溢出。
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 2fa290372dfe7dd248b1c16f943f273a3e674f22 ~ c76bf8359188a11f8fd790e5bbd6077894a245cc -
Linux Linux 6.8 -

II. Public POCs for CVE-2025-39815

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III. Intelligence Information for CVE-2025-39815

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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-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-2023-53331 7.8 HIGH pstore/ram: Check start of empty przs during init
CVE-2025-39836 7.8 HIGH efi: stmm: Fix incorrect buffer allocation method
CVE-2023-53274 7.8 HIGH clk: mediatek: mt8183: Add back SSPM related clocks
CVE-2025-39825 7.8 HIGH smb: client: fix race with concurrent opens in rename(2)

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-2025-39815

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