{
  "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-2023-52993",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52993",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-03-27T16:43:28.263Z",
    "updatedAt": "2026-05-11T19:36:32.785Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "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": "x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL\n\nBaoquan reported that after triggering a crash the subsequent crash-kernel\nfails to boot about half of the time. It triggers a NULL pointer\ndereference in the periodic tick code.\n\nThis happens because the legacy timer interrupt (IRQ0) is resent in\nsoftware which happens in soft interrupt (tasklet) context. In this context\nget_irq_regs() returns NULL which leads to the NULL pointer dereference.\n\nThe reason for the resend is a spurious APIC interrupt on the IRQ0 vector\nwhich is captured and leads to a resend when the legacy timer interrupt is\nenabled. This is wrong because the legacy PIC interrupts are level\ntriggered and therefore should never be resent in software, but nothing\never sets the IRQ_LEVEL flag on those interrupts, so the core code does not\nknow about their trigger type.\n\nEnsure that IRQ_LEVEL is set when the legacy PCI interrupts are set up.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "744fe9be9665227335539b7a77ece8d9ff62b6c0"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "496975d1a2937f4baadf3d985991b13fc4fc4f27"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8770cd9d7c14aa99c255a0d08186f0be953e1638"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e284c273dbb4c1ed68d4204bff94d0b10e4a90f5"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0b08201158f177aab469e356b4d6af24fdd118df"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "137f1b47da5f58805da42c1b7811e28c1e353f39"
            },
            {
              "version": "a4633adcdbc15ac51afcd0e1395de58cee27cf92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5fa55950729d0762a787451dc52862c3f850f859"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.18"
            },
            {
              "version": "4.14.305",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.272",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.231",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.166",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.91",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}