fkie_cve-2024-26999
Vulnerability from fkie_nvd
Published
2024-05-01 06:15
Modified
2025-03-04 16:33
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: serial/pmac_zilog: Remove flawed mitigation for rx irq flood The mitigation was intended to stop the irq completely. That may be better than a hard lock-up but it turns out that you get a crash anyway if you're using pmac_zilog as a serial console: ttyPZ0: pmz: rx irq flood ! BUG: spinlock recursion on CPU#0, swapper/0 That's because the pr_err() call in pmz_receive_chars() results in pmz_console_write() attempting to lock a spinlock already locked in pmz_interrupt(). With CONFIG_DEBUG_SPINLOCK=y, this produces a fatal BUG splat. The spinlock in question is the one in struct uart_port. Even when it's not fatal, the serial port rx function ceases to work. Also, the iteration limit doesn't play nicely with QEMU, as can be seen in the bug report linked below. A web search for other reports of the error message "pmz: rx irq flood" didn't produce anything. So I don't think this code is needed any more. Remove it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1be3226445362bfbf461c92a5bcdb1723f2e4907Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52aaf1ff14622a04148dbb9ccce6d9de5d534ea7Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69a02273e288011b521ee7c1f3ab2c23fda633cePatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a3bbe41efa55323b6ea3c35fa15941d4dbecdefPatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab86cf6f8d24e63e9aca23da5108af1aa5483928Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bbaafbb4651fede8d3c3881601ecaa4f834f9d3fPatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d679c816929d62af51c8e6d7fc0e165c9412d2f3Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1be3226445362bfbf461c92a5bcdb1723f2e4907Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/52aaf1ff14622a04148dbb9ccce6d9de5d534ea7Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/69a02273e288011b521ee7c1f3ab2c23fda633cePatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7a3bbe41efa55323b6ea3c35fa15941d4dbecdefPatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ab86cf6f8d24e63e9aca23da5108af1aa5483928Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bbaafbb4651fede8d3c3881601ecaa4f834f9d3fPatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d679c816929d62af51c8e6d7fc0e165c9412d2f3Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
debian debian_linux 10.0


To clipboard 

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   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nserial/pmac_zilog: Remove flawed mitigation for rx irq flood\n\nThe mitigation was intended to stop the irq completely. That may be\nbetter than a hard lock-up but it turns out that you get a crash anyway\nif you're using pmac_zilog as a serial console:\n\nttyPZ0: pmz: rx irq flood !\nBUG: spinlock recursion on CPU#0, swapper/0\n\nThat's because the pr_err() call in pmz_receive_chars() results in\npmz_console_write() attempting to lock a spinlock already locked in\npmz_interrupt(). With CONFIG_DEBUG_SPINLOCK=y, this produces a fatal\nBUG splat. The spinlock in question is the one in struct uart_port.\n\nEven when it's not fatal, the serial port rx function ceases to work.\nAlso, the iteration limit doesn't play nicely with QEMU, as can be\nseen in the bug report linked below.\n\nA web search for other reports of the error message \"pmz: rx irq flood\"\ndidn't produce anything. So I don't think this code is needed any more.\nRemove it.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: serial/pmac_zilog: eliminar la mitigación defectuosa para rx irq Flood La mitigación tenía como objetivo detener irq por completo. Esto puede ser mejor que un bloqueo duro, pero resulta que de todos modos se bloquea si estás usando pmac_zilog como consola serie: ttyPZ0: pmz: rx irq Flood ! ERROR: recursión de spinlock en CPU#0, swapper/0 Esto se debe a que la llamada pr_err() en pmz_receive_chars() da como resultado que pmz_console_write() intente bloquear un spinlock ya bloqueado en pmz_interrupt(). Con CONFIG_DEBUG_SPINLOCK=y, esto produce un error fatal. El spinlock en cuestión es el de la estructura uart_port. Incluso cuando no es fatal, la función de recepción del puerto serie deja de funcionar. Además, el límite de iteración no funciona bien con QEMU, como se puede ver en el informe de error vinculado a continuación. Una búsqueda en la web de otros informes del mensaje de error \"pmz: rx irq Flood\" no produjo nada. Así que no creo que este código ya sea necesario. Retírelo.",
      },
   ],
   id: "CVE-2024-26999",
   lastModified: "2025-03-04T16:33:03.743",
   metrics: {
      cvssMetricV31: [
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               attackComplexity: "LOW",
               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",
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
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               lang: "en",
               value: "CWE-667",
            },
         ],
         source: "nvd@nist.gov",
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}


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