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CVE-2026-46022— misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()

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ibmasm_handle_mouse_interrupt函数中队列读取器或写入器索引超出REMOTE_QUEUE_SIZE范围时执行越界MMIO读取，可能导致从非预期设备寄存器读取数据。

AI Predicted 5.3 Difficulty: Hard EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 278d72ae8803ffcd16070c95fe1d53f4466dc741< 6f6ecc9153df176e956d0664b56f93080b0a45f0 affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< bac8643486f854dd53af9b23aea7dbbd9b7c1865 affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< fc7e9a74e32299d7e93e178ca482a0b59ef1595b affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< 07c4f18b303106e6b24492c12b95d48a4b985841 affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< 22a16d3eafee92a165c756081587c95850127107 affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 affected
278d72ae8803ffcd16070c95fe1d53f4466dc741< 4b6e6ead556734bdc14024c5f837132b1e7a4b84 affected
… +10 more rows
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I. Basic Information for CVE-2026-46022

Vulnerability Information
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Vulnerability Title
misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt() ibmasm_handle_mouse_interrupt() performs an out-of-bounds MMIO read when the queue reader or writer index from hardware exceeds REMOTE_QUEUE_SIZE (60). A compromised service processor can trigger this by writing an out-of-range value to the reader or writer MMIO register before asserting an interrupt. Since writer is re-read from hardware on every loop iteration, it can also be set to an out-of-range value after the loop has already started. The root cause is that get_queue_reader() and get_queue_writer() return raw readl() values that are passed directly into get_queue_entry(), which computes: queue_begin + reader * sizeof(struct remote_input) with no bounds check. This unchecked MMIO address is then passed to memcpy_fromio(), reading 8 bytes from unintended device registers. For sufficiently large values the address falls outside the PCI BAR mapping entirely, triggering a machine check exception. Fix by checking both indices against REMOTE_QUEUE_SIZE at the top of the loop body, before any call to get_queue_entry(). On an out-of-range value, reset the reader register to 0 via set_queue_reader() before breaking, so that normal queue operation can resume if the corrupted hardware state is transient.
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ibmasm_handle_mouse_interrupt函数中队列读取器或写入器索引超出REMOTE_QUEUE_SIZE范围时执行越界MMIO读取，可能导致从非预期设备寄存器读取数据。
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 278d72ae8803ffcd16070c95fe1d53f4466dc741 ~ 6f6ecc9153df176e956d0664b56f93080b0a45f0 -
Linux Linux 2.6.13 -

II. Public POCs for CVE-2026-46022

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III. Intelligence Information for CVE-2026-46022

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Patches & Fixes for CVE-2026-46022 (7)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45909 7.8 HIGH clk: mediatek: Drop __initconst from gates
CVE-2026-46015 7.8 HIGH tcp: call sk_data_ready() after listener migration
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-46062 7.8 HIGH ntfs3: fix integer overflow in run_unpack() volume boundary check
CVE-2026-46065 7.8 HIGH fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info
CVE-2026-45878 7.8 HIGH drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-45894 7.8 HIGH iommu/vt-d: Clear Present bit before tearing down PASID entry

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46022

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