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CVE-2026-80572— Input: byd - synchronize timer deletion before freeing private 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基金会开源的一个操作系统内核。 Linux kernel 4.6至7.2之前版本存在安全漏洞，该漏洞源于byd_disconnect()在释放私有数据前未同步删除定时器，导致定时器回调与断开操作存在竞争条件，可能造成释放后重用，从而导致本地权限提升或内核崩溃。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 2d5f5611dd0de52e9a52b56391a7049a52184e72< 84b205297fa15f97510342221d8c9a0119711478 affected
2d5f5611dd0de52e9a52b56391a7049a52184e72< 28d984a66b9e14be74986167b6ad40b5e0daf19a affected
2d5f5611dd0de52e9a52b56391a7049a52184e72< ee944a706a18322b4a2599eebe8040a2994e928f affected
2d5f5611dd0de52e9a52b56391a7049a52184e72< 8dbfd8e32a13e116790780ed0be82b5a05eb9916 affected
2d5f5611dd0de52e9a52b56391a7049a52184e72< 2e509ef60ee41a2da0deb062c262bb530143fb37 affected
2d5f5611dd0de52e9a52b56391a7049a52184e72< c83e79c0842ed29860648bcce5022ef0ba5001c6 affected
4.6 affected
< 4.6 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-80572

Vulnerability Information
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Vulnerability Title
Input: byd - synchronize timer deletion before freeing private data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Input: byd - synchronize timer deletion before freeing private data byd_disconnect() uses timer_delete() before freeing the driver's private data. This does not wait for a running byd_clear_touch() callback, which dereferences the private data and its psmouse pointer. A callback racing with disconnect can therefore access the private data after it has been freed. The timer can also still be re-armed by byd_process_byte() while the disconnect is in progress. Use timer_shutdown_sync() before freeing the private data: it waits for a running callback and turns any later re-arm attempt into a no-op.
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基金会开源的一个操作系统内核。 Linux kernel 4.6至7.2之前版本存在安全漏洞，该漏洞源于byd_disconnect()在释放私有数据前未同步删除定时器，导致定时器回调与断开操作存在竞争条件，可能造成释放后重用，从而导致本地权限提升或内核崩溃。
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 2d5f5611dd0de52e9a52b56391a7049a52184e72 ~ 84b205297fa15f97510342221d8c9a0119711478 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-80572

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III. Intelligence Information for CVE-2026-80572

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Patches & Fixes for CVE-2026-80572 (3)

Other References for CVE-2026-80572 (3)

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-2026-80572

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