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CVE-2026-80569— Input: synaptics-rmi4 - bound the F54 report size to the allocated buffer

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.

在 Linux 内核中，以下漏洞已得到修复： 输入：synaptics-rmi4 - 将 F54 报告大小限制在已分配的缓冲区范围内 会从设备读取诊断报告到 ，传输大小由 确定： 在 probe 阶段一次性分配，其大小基于 F54 自身的电极数量计算（ ）。然而， 在 被设置时，会从 F55 功能的电极数量计算大小。这两个计数都直接来自设备查询（F54 和 F55 各自最多报告 255 个电极），并且没有任何机制将 F55 的计数约束在 F54 的计数之内。 一个恶意或故障的 RMI4 设备如果报告的 F55 电极

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c762cc68b6a12eedebefc156ea4838e54804e2eb< 6b3bdd44d4cd7d5e35de1d0f06d4930f3cecd403 affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< b2f596f00d27703ce09167201ba57f55be8d2f9a affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< b3932101c9c457148038392bc977f9b31e125a86 affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< 12be3c6ca9589afd6ade41a59c761866e526634d affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< 42eaf0e6f79c487f419737314cf0760f7331d368 affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< 6b06aab79ff166d5781ce792d91acc2e58b1770b affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< b7b9a8b1c303b62371698e396654d6724c79cb74 affected
c762cc68b6a12eedebefc156ea4838e54804e2eb< 49c5adc2b7d6e43c5cf033e1c86fdb9c16ababb1 affected
… +10 more rows
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I. Basic Information for CVE-2026-80569

Vulnerability Information
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Vulnerability Title
Input: synaptics-rmi4 - bound the F54 report size to the allocated buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - bound the F54 report size to the allocated buffer rmi_f54_work() reads a diagnostics report from the device into f54->report_data, sizing the transfer with rmi_f54_get_report_size(): report_size = rmi_f54_get_report_size(f54); ... for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) { int size = min(F54_REPORT_DATA_SIZE, report_size - i); ... rmi_read_block(.., f54->report_data + i, size); } report_data is allocated once at probe from F54's own electrode counts (array3_size(f54->num_tx_electrodes, f54->num_rx_electrodes, sizeof(u16))), but rmi_f54_get_report_size() computes the size from drv_data->num_*_electrodes when those are set, i.e. from the F55 function's electrode counts. Both counts come straight from device queries (F54 and F55 each report up to 255 electrodes) and nothing constrains the F55 counts to the F54 ones. A malicious or malfunctioning RMI4 device that reports larger F55 electrode counts than its F54 counts makes report_size exceed the allocation, so the read loop writes past report_data (and the V4L2 dequeue memcpy() then reads past it). On conforming hardware the F55 configured electrodes are a subset of the F54 physical electrodes, so report_size never exceeds the buffer and well-behaved devices are unaffected. Record the allocation size and reject a report that does not fit, mirroring the existing zero-size check.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c762cc68b6a12eedebefc156ea4838e54804e2eb ~ 6b3bdd44d4cd7d5e35de1d0f06d4930f3cecd403 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-80569

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III. Intelligence Information for CVE-2026-80569

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Patches & Fixes for CVE-2026-80569 (7)

Other References for CVE-2026-80569 (1)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80569

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