CVE-2023-52993 (GCVE-0-2023-52993)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-05-11 19:36
VLAI
Title
x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:08 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 744fe9be9665227335539b7a77ece8d9ff62b6c0 (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 496975d1a2937f4baadf3d985991b13fc4fc4f27 (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 8770cd9d7c14aa99c255a0d08186f0be953e1638 (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < e284c273dbb4c1ed68d4204bff94d0b10e4a90f5 (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 0b08201158f177aab469e356b4d6af24fdd118df (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 137f1b47da5f58805da42c1b7811e28c1e353f39 (git)
Affected: a4633adcdbc15ac51afcd0e1395de58cee27cf92 , < 5fa55950729d0762a787451dc52862c3f850f859 (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 4.14.305 , ≤ 4.14.* (semver)
Unaffected: 4.19.272 , ≤ 4.19.* (semver)
Unaffected: 5.4.231 , ≤ 5.4.* (semver)
Unaffected: 5.10.166 , ≤ 5.10.* (semver)
Unaffected: 5.15.91 , ≤ 5.15.* (semver)
Unaffected: 6.1.9 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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            "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."
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            "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."
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      "current_release_date": "2026-11-06T13:16:57+00:00",
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      "product_status:known_affected": "199",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL",
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                ]
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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  }
}



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