fkie_cve-2023-52993
Vulnerability from fkie_nvd
Published
2025-03-27 17:15
Modified
2025-04-15 14:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL Baoquan reported that after triggering a crash the subsequent crash-kernel fails to boot about half of the time. It triggers a NULL pointer dereference in the periodic tick code. This happens because the legacy timer interrupt (IRQ0) is resent in software which happens in soft interrupt (tasklet) context. In this context get_irq_regs() returns NULL which leads to the NULL pointer dereference. The reason for the resend is a spurious APIC interrupt on the IRQ0 vector which is captured and leads to a resend when the legacy timer interrupt is enabled. This is wrong because the legacy PIC interrupts are level triggered and therefore should never be resent in software, but nothing ever sets the IRQ_LEVEL flag on those interrupts, so the core code does not know about their trigger type. Ensure that IRQ_LEVEL is set when the legacy PCI interrupts are set up.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118dfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/i8259: Marcar interrupciones PIC heredadas con IRQ_LEVEL. Baoquan inform\u00f3 que, tras desencadenar un fallo, el kernel posterior al fallo no arranca aproximadamente la mitad de las veces. Esto desencadena una desreferencia de puntero NULL en el c\u00f3digo de tick peri\u00f3dico. Esto sucede porque la interrupci\u00f3n del temporizador heredada (IRQ0) se reenv\u00eda por software, lo que ocurre en el contexto de una interrupci\u00f3n suave (tasklet). En este contexto, get_irq_regs() devuelve NULL, lo que provoca la desreferencia de puntero NULL. El motivo del reenv\u00edo es una interrupci\u00f3n APIC espuria en el vector IRQ0, que se captura y provoca un reenv\u00edo cuando se habilita la interrupci\u00f3n del temporizador heredada. Esto es incorrecto porque las interrupciones PIC heredadas se activan por nivel y, por lo tanto, nunca deber\u00edan reenviarse por software; sin embargo, nada activa el indicador IRQ_LEVEL en esas interrupciones, por lo que el c\u00f3digo principal desconoce su tipo de activaci\u00f3n. Aseg\u00farese de que IRQ_LEVEL est\u00e9 activado al configurar las interrupciones PCI heredadas."
    }
  ],
  "id": "CVE-2023-52993",
  "lastModified": "2025-04-15T14:32:23.007",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-03-27T17:15:46.820",
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  "vulnStatus": "Analyzed",
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          "value": "CWE-476"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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