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perf: Fix hang while freeing sigtrap event

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: perf: Fix hang while freeing sigtrap event Perf can hang while freeing a sigtrap event if a related deferred signal hadn't managed to be sent before the file got closed: perf_event_overflow() task_work_add(perf_pending_task) fput() task_work_add(____fput()) task_work_run() ____fput() perf_release() perf_event_release_kernel() _free_event() perf_pending_task_sync() task_work_cancel() -> FAILED rcuwait_wait_event() Once task_work_run() is running, the list of pending callbacks is removed from the task_struct and from this point on task_work_cancel() can't remove any pending and not yet started work items, hence the task_work_cancel() failure and the hang on rcuwait_wait_event(). Task work could be changed to remove one work at a time, so a work running on the current task can always cancel a pending one, however the wait / wake design is still subject to inverted dependencies when remote targets are involved, as pictured by Oleg: T1 T2 fd = perf_event_open(pid => T2->pid); fd = perf_event_open(pid => T1->pid); close(fd) close(fd) perf_event_overflow() perf_event_overflow() task_work_add(perf_pending_task) task_work_add(perf_pending_task) fput() fput() task_work_add(____fput()) task_work_add(____fput()) task_work_run() task_work_run() ____fput() ____fput() perf_release() perf_release() perf_event_release_kernel() perf_event_release_kernel() _free_event() _free_event() perf_pending_task_sync() perf_pending_task_s

Announced Source revision 1
Original source ↗

CVE-2025-37747

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-2025-37747

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "104e258a004037bc7dba9f6085c71dad6af57ad4",
        "lessThan": "aae58a39ac4c63c3fa53536fb2504c9f1d0e1719",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5465418f5fd970e86a86c7f4075be262682840",
        "lessThan": "fa1827fa968c0674e9b6fca223fa9fb4da4493eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5465418f5fd970e86a86c7f4075be262682840",
        "lessThan": "665b87b8f8b3aeb49083ef3b65c4953e7753fc12",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5465418f5fd970e86a86c7f4075be262682840",
        "lessThan": "1267bd38f161c1a27d9b722de017027167a225a0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5465418f5fd970e86a86c7f4075be262682840",
        "lessThan": "56799bc035658738f362acec3e7647bb84e68933",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9ad46f1fef421d43cdab3a7d1744b2f43b54dae0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed2c202dac55423a52d7e2290f2888bf08b8ee99",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f34d8307a73a18de5320fcc6f40403146d061891",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.44",
        "lessThan": "6.6.160",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.165",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.103",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.10.3",
        "lessThan": "6.11",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "include/linux/perf_event.h",
      "kernel/events/core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.14.*"
      },
      {
        "status": "unaffected",
        "version": "6.15",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/linux/perf_event.h",
      "kernel/events/core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-37747

Source reference: /cveMetadata/cveId

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Event
#45968 · Revision 1
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