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CVE-2026-64565— Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ims_pcu_process_data()函数处理传入URB数据时未检查read_pos索引是否超过IMS_PCU_BUF_SIZE，导致堆缓冲区溢出，可能被恶意USB设备利用以劫持控制流。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 628329d52474323938a03826941e166bc7c8eff4< 06cfff93fd40441292567b999091beab11c74504 affected
628329d52474323938a03826941e166bc7c8eff4< 992a7173364dcf63e30012af43da3c2f279839f9 affected
628329d52474323938a03826941e166bc7c8eff4< 3a801bc75ba1d121d0ed60e7234f93ba5651d87d affected
628329d52474323938a03826941e166bc7c8eff4< 40bbbf2e91fd60715525bf0405c67876af817edf affected
628329d52474323938a03826941e166bc7c8eff4< ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49 affected
628329d52474323938a03826941e166bc7c8eff4< d03a740e087de7dcb2a26dc1123377bd3d1d84ca affected
628329d52474323938a03826941e166bc7c8eff4< 875115b82c295277b81b6dfee7debc725f44e854 affected
3.10 affected
… +8 more rows
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I. Basic Information for CVE-2026-64565

Vulnerability Information
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Vulnerability Title
Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data() The `ims_pcu_process_data()` processes incoming URB data byte by byte. However, it fails to check if the `read_pos` index exceeds IMS_PCU_BUF_SIZE. If a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE, `read_pos` will increment indefinitely. Moreover, since `read_pos` is located immediately after `read_buf`, the attacker can overwrite `read_pos` itself to arbitrarily control the index. This manipulated `read_pos` is subsequently used in `ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a heap buffer overflow. Specifically, an attacker can overwrite the `cmd_done.wait.head` located at offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`. Consequently, when the driver calls `complete(&pcu->cmd_done)`, it triggers a control flow hijack by using the manipulated pointer. Fix this by adding a bounds check for `read_pos` before writing to `read_buf`. If the packet is too long, discard it, log a warning, and reset the parser state. [dtor: factor out resetting packet state, reset checksum as well]
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ims_pcu_process_data()函数处理传入URB数据时未检查read_pos索引是否超过IMS_PCU_BUF_SIZE，导致堆缓冲区溢出，可能被恶意USB设备利用以劫持控制流。
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 628329d52474323938a03826941e166bc7c8eff4 ~ 06cfff93fd40441292567b999091beab11c74504 -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-64565

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III. Intelligence Information for CVE-2026-64565

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Patches & Fixes for CVE-2026-64565 (5)

Same Patch Batch · Linux · 2026-08-04 · 5 CVEs total

CVE-2026-64564 9.8 CRITICAL sctp: don't free the ASCONF's own transport in DEL-IP processing
CVE-2026-64562 8.8 HIGH KVM: nVMX: Hide shadow VMCS right after VMCLEAR
CVE-2026-64561 8.8 HIGH KVM: x86: Check for invalid/obsolete root *after* making MMU pages available
CVE-2026-64563 7.8 HIGH rhashtable: clear stale iter->p on table restart

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64565

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