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CVE-2026-97925— tick/broadcast: Plug clockevents replacement race

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，已修复以下漏洞： tick/broadcast：修复 clockevents 替换时的竞态条件 朱恺乾（Zhu Kaqian）报告并分析了在替换广播设备时出现的以下竞态条件： CPUA --- <- 失败：对一个已分离的设备进行了触发（arms a detached device） 如果原始广播设备的中断亲和性掩码（interrupt affinity mask）是受限的，并且该掩码中最后一个 CPU 下线，则会触发 中的 ，因为此时 clockevent 设备并未处于分离（detached

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1690 · Prevent Command History Logging

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 338d6859cd1580617807290f6d7e92b1662d4695 affected
f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 757aa9f548c18b96da1d56d11f65be8188a16d59 affected
f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 3da55616db2b6b7d9caa3b7ff1e8983224e0ed52 affected
f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 3525b94b2f258e0b99d1ee5a82a80b51bc1cc818 affected
f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 292b7a8ed84032cfdfc9076a690360f7d3f640d4 affected
f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98< 113a9796effe3376d2ec5aabcca1fef4fef4cd62 affected
2.6.21 affected
< 2.6.21 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-97925

Vulnerability Information
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Vulnerability Title
tick/broadcast: Plug clockevents replacement race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tick/broadcast: Plug clockevents replacement race 朱恺乾 reported and decoded the following race condition when a broadcast device is replaced: CPUA CPUB __tick_broadcast_oneshot_control() bc = tick_broadcast_device.evtdev; tick_install_broadcast_device(dev) clockevents_exchange_device(cur, dev) shutdown(cur); detach(cur); cur->handler = noop; tick_broadcast_device.evtdev = dev; tick_broadcast_set_event(bc, next_event); <- FAIL: arms a detached device. If the original broadcast device has a restricted interrupt affinity mask and the last CPU in that mask goes offline then the BUG() in tick_cleanup_dead_cpu() triggers because the clockevent device is not in detached state. The reason for this is that tick_install_broadcast_device() is not serialized vs. tick broadcast operations. The obvious cure is to serialize tick_install_broadcast_device() with tick_broadcast_lock against a concurrent tick broadcast operation. That requires to split clockevents_exchange_device() into two parts, one which does the exchange, shutdown and detach operation and the other which drops the module reference count. This is required because the module reference cannot be dropped while holding tick_broadcast_lock. Let clockevents_exchange_device() do both operations as before, but let the broadcast device code take the two step approach and do the device exchange under tick_broadcast_lock and drop the module reference count after releasing it.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98 ~ 338d6859cd1580617807290f6d7e92b1662d4695 -
Linux Linux 2.6.21 -

II. Public POCs for CVE-2026-97925

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III. Intelligence Information for CVE-2026-97925

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Patches & Fixes for CVE-2026-97925 (6)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97925

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