Skip to content
Heist/ feed
Unrated

tick/broadcast: Plug clockevents replacement race

Type: advisorySource: Official CVE List1 source record

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 releasi

Announced Source revision 1
Original source ↗

CVE-2026-97925

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97925

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "338d6859cd1580617807290f6d7e92b1662d4695",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "757aa9f548c18b96da1d56d11f65be8188a16d59",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "3da55616db2b6b7d9caa3b7ff1e8983224e0ed52",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "3525b94b2f258e0b99d1ee5a82a80b51bc1cc818",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "292b7a8ed84032cfdfc9076a690360f7d3f640d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
        "lessThan": "113a9796effe3376d2ec5aabcca1fef4fef4cd62",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/time/clockevents.c",
      "kernel/time/tick-broadcast.c",
      "kernel/time/tick-internal.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.21"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.21",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/time/clockevents.c",
      "kernel/time/tick-broadcast.c",
      "kernel/time/tick-internal.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97925

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38075 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement