{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-40142",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40142",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-11-12T10:23:25.191Z",
    "updatedAt": "2026-05-11T21:43:34.212Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ALSA: pcm: Disable bottom softirqs as part of spin_lock_irq() on PREEMPT_RT",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Disable bottom softirqs as part of spin_lock_irq() on PREEMPT_RT\n\nsnd_pcm_group_lock_irq() acquires a spinlock_t and disables interrupts\nvia spin_lock_irq(). This also implicitly disables the handling of\nsoftirqs such as TIMER_SOFTIRQ.\nOn PREEMPT_RT softirqs are preemptible and spin_lock_irq() does not\ndisable them. That means a timer can be invoked during spin_lock_irq()\non the same CPU. Due to synchronisations reasons local_bh_disable() has\na per-CPU lock named softirq_ctrl.lock which synchronizes individual\nsoftirq against each other.\nsyz-bot managed to trigger a lockdep report where softirq_ctrl.lock is\nacquired in hrtimer_cancel() in addition to hrtimer_run_softirq(). This\nis a possible deadlock.\n\nThe softirq_ctrl.lock can not be made part of spin_lock_irq() as this\nwould lead to too much synchronisation against individual threads on the\nsystem. To avoid the possible deadlock, softirqs must be manually\ndisabled before the lock is acquired.\n\nDisable softirqs before the lock is acquired on PREEMPT_RT.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "status": "affected",
              "versionType": "git",
              "lessThan": "63ee96c7f47df239ee0a6e8108b6bfd8c98334ae"
            },
            {
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3969b6193cb7a45aa5fb4ec68f215e9e7f93d39a"
            },
            {
              "version": "d2d6422f8bd17c6bb205133e290625a564194496",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9fc4a3da9a0259a0500848b5d8657918efde176b"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.12"
            },
            {
              "version": "6.12.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.17.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "version": "6.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}