CVE-2024-26999 (GCVE-0-2024-26999)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:28 – Updated: 2026-05-11 20:08
VLAI
Title
serial/pmac_zilog: Remove flawed mitigation for rx irq flood
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:44 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 69a02273e288011b521ee7c1f3ab2c23fda633ce (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d679c816929d62af51c8e6d7fc0e165c9412d2f3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ab86cf6f8d24e63e9aca23da5108af1aa5483928 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7a3bbe41efa55323b6ea3c35fa15941d4dbecdef (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bbaafbb4651fede8d3c3881601ecaa4f834f9d3f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 52aaf1ff14622a04148dbb9ccce6d9de5d534ea7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1be3226445362bfbf461c92a5bcdb1723f2e4907 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.19.313 , ≤ 4.19.* (semver)
Unaffected: 5.4.275 , ≤ 5.4.* (semver)
Unaffected: 5.10.216 , ≤ 5.10.* (semver)
Unaffected: 5.15.157 , ≤ 5.15.* (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: serial/pmac_zilog: eliminar la mitigaci\u00f3n defectuosa para rx irq Flood La mitigaci\u00f3n ten\u00eda como objetivo detener irq por completo. Esto puede ser mejor que un bloqueo duro, pero resulta que de todos modos se bloquea si est\u00e1s usando pmac_zilog como consola serie: ttyPZ0: pmz: rx irq Flood ! ERROR: recursi\u00f3n 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 cuesti\u00f3n es el de la estructura uart_port. Incluso cuando no es fatal, la funci\u00f3n de recepci\u00f3n del puerto serie deja de funcionar. Adem\u00e1s, el l\u00edmite de iteraci\u00f3n no funciona bien con QEMU, como se puede ver en el informe de error vinculado a continuaci\u00f3n. Una b\u00fasqueda en la web de otros informes del mensaje de error \"pmz: rx irq Flood\" no produjo nada. As\u00ed que no creo que este c\u00f3digo ya sea necesario. Ret\u00edrelo."
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            },
            {
              "url": "https://git.kernel.org/stable/c/ab86cf6f8d24e63e9aca23da5108af1aa5483928"
            },
            {
              "url": "https://git.kernel.org/stable/c/7a3bbe41efa55323b6ea3c35fa15941d4dbecdef"
            },
            {
              "url": "https://git.kernel.org/stable/c/bbaafbb4651fede8d3c3881601ecaa4f834f9d3f"
            },
            {
              "url": "https://git.kernel.org/stable/c/52aaf1ff14622a04148dbb9ccce6d9de5d534ea7"
            },
            {
              "url": "https://git.kernel.org/stable/c/ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729"
            },
            {
              "url": "https://git.kernel.org/stable/c/1be3226445362bfbf461c92a5bcdb1723f2e4907"
            }
          ],
          "title": "serial/pmac_zilog: Remove flawed mitigation for rx irq flood",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26999",
        "datePublished": "2024-05-01T05:28:30.760Z",
        "dateReserved": "2024-02-19T14:20:24.206Z",
        "dateUpdated": "2025-05-04T09:01:50.540Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.