Vulnerability-Lookup

GHSA-GFR2-Q5Q8-V55V

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

timers/migration: Fix livelock in tmigr_handle_remote_up()

tmigr_handle_remote_cpu() skips timer_expire_remote() when cpu == smp_processor_id(), assuming the local softirq path already handled this CPU's timers.

This assumption is wrong because jiffies can advance after the handling of the CPU's global timers in run_timer_base(BASE_GLOBAL) and before tmigr_handle_remote() evaluates the expiry times.

As a consequence a timer which expires after the CPU local timer wheel advanced and becomes expired in the remote handling is ignored and the callback is never invoked and removed from the timer wheel.

What's worse is that fetch_next_timer_interrupt_remote() keeps reporting it as expired, and the event is re-queued with expires == now on each iteration. The goto-again loop spins indefinitely.

Fix this by calling timer_expire_remote() unconditionally. That's minimal overhead for the common case as __run_timer_base() returns immediately if there is nothing to expire in the local wheel.

[ tglx: Amend change log and add a comment ]

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53180"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:35Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntimers/migration: Fix livelock in tmigr_handle_remote_up()\n\ntmigr_handle_remote_cpu() skips timer_expire_remote() when cpu ==\nsmp_processor_id(), assuming the local softirq path already handled this\nCPU\u0027s timers.\n\nThis assumption is wrong because jiffies can advance after the handling of\nthe CPU\u0027s global timers in run_timer_base(BASE_GLOBAL) and before\ntmigr_handle_remote() evaluates the expiry times.\n\nAs a consequence a timer which expires after the CPU local timer wheel\nadvanced and becomes expired in the remote handling is ignored and the\ncallback is never invoked and removed from the timer wheel.\n\nWhat\u0027s worse is that fetch_next_timer_interrupt_remote() keeps reporting it\nas expired, and the event is re-queued with expires == now on each\niteration.  The goto-again loop spins indefinitely.\n\nFix this by calling timer_expire_remote() unconditionally. That\u0027s minimal\noverhead for the common case as __run_timer_base() returns immediately if\nthere is nothing to expire in the local wheel.\n\n[ tglx: Amend change log and add a comment ]",
  "id": "GHSA-gfr2-q5q8-v55v",
  "modified": "2026-06-28T09:31:43Z",
  "published": "2026-06-25T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53180"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07b3b83587fb3012619f4439389b64a955fc7836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d6c2062b77be09ec15d6bf637b2e2221c4482fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d338e61ea94052a786aac9f58e9f0d8520afa0fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d486b4934a8e504376b85cdb3766f306d57aff5b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53180 (GCVE-0-2026-53180)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-28 06:39

Title

timers/migration: Fix livelock in tmigr_handle_remote_up()

Summary

In the Linux kernel, the following vulnerability has been resolved: timers/migration: Fix livelock in tmigr_handle_remote_up() tmigr_handle_remote_cpu() skips timer_expire_remote() when cpu == smp_processor_id(), assuming the local softirq path already handled this CPU's timers. This assumption is wrong because jiffies can advance after the handling of the CPU's global timers in run_timer_base(BASE_GLOBAL) and before tmigr_handle_remote() evaluates the expiry times. As a consequence a timer which expires after the CPU local timer wheel advanced and becomes expired in the remote handling is ignored and the callback is never invoked and removed from the timer wheel. What's worse is that fetch_next_timer_interrupt_remote() keeps reporting it as expired, and the event is re-queued with expires == now on each iteration. The goto-again loop spins indefinitely. Fix this by calling timer_expire_remote() unconditionally. That's minimal overhead for the common case as __run_timer_base() returns immediately if there is nothing to expire in the local wheel. [ tglx: Amend change log and add a comment ]

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/07b3b83587fb30126…
https://git.kernel.org/stable/c/1d6c2062b77be09ec…
https://git.kernel.org/stable/c/d338e61ea94052a78…
https://git.kernel.org/stable/c/d486b4934a8e50437…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7ee988770326fca440472200c3eb58935fe712f6 , < 07b3b83587fb3012619f4439389b64a955fc7836 (git) Affected: 7ee988770326fca440472200c3eb58935fe712f6 , < 1d6c2062b77be09ec15d6bf637b2e2221c4482fc (git) Affected: 7ee988770326fca440472200c3eb58935fe712f6 , < d338e61ea94052a786aac9f58e9f0d8520afa0fd (git) Affected: 7ee988770326fca440472200c3eb58935fe712f6 , < d486b4934a8e504376b85cdb3766f306d57aff5b (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

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  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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              "versionType": "git"
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          "defaultStatus": "affected",
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            "kernel/time/timer_migration.c"
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          "versions": [
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              "version": "6.9"
            },
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              "versionType": "semver"
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              "status": "unaffected",
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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        }
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    "datePublished": "2026-06-25T08:38:55.332Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
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    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-GFR2-Q5Q8-V55V

CVE-2026-53180 (GCVE-0-2026-53180)

Tags

Sightings

Nomenclature