CVE-2026-43344 (GCVE-0-2026-43344)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:39 – Updated: 2026-11-06 15:42
VLAI
Title
perf/x86/intel/uncore: Fix die ID init and look up bugs
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel/uncore: Fix die ID init and look up bugs In snbep_pci2phy_map_init(), in the nr_node_ids > 8 path, uncore_device_to_die() may return -1 when all CPUs associated with the UBOX device are offline. Remove the WARN_ON_ONCE(die_id == -1) check for two reasons: - The current code breaks out of the loop. This is incorrect because pci_get_device() does not guarantee iteration in domain or bus order, so additional UBOX devices may be skipped during the scan. - Returning -EINVAL is incorrect, since marking offline buses with die_id == -1 is expected and should not be treated as an error. Separately, when NUMA is disabled on a NUMA-capable platform, pcibus_to_node() returns NUMA_NO_NODE, causing uncore_device_to_die() to return -1 for all PCI devices. As a result, spr_update_device_location(), used on Intel SPR and EMR, ignores the corresponding PMON units and does not add them to the RB tree. Fix this by using uncore_pcibus_to_dieid(), which retrieves topology from the UBOX GIDNIDMAP register and works regardless of whether NUMA is enabled in Linux. This requires snbep_pci2phy_map_init() to be added in spr_uncore_pci_init(). Keep uncore_device_to_die() only for the nr_node_ids > 8 case, where NUMA is expected to be enabled.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 15:36 UTC
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: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < 4eb511275e37c580156e787baab5232aeb0bfea0 (git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < 184870af0e73f8ea2577c751fa098681465249f2 (git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < bdb35811ff41a1678620a407056b6372f350028a (git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < c79ef3342632e71ac8612a2a1cc17ac84dd258b4 (git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < 6a5dc3ee97581da2907fc7acd62853f07184de67 (git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < a16d1ec4dd0cdcf689f324adde6067083bce9099 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: perf/x86/intel/uncore: Correcci\u00f3n de errores de inicializaci\u00f3n y b\u00fasqueda del ID de die En snbep_pci2phy_map_init(), en la ruta nr_node_ids mayor que 8, uncore_device_to_die() puede devolver -1 cuando todas las CPU asociadas con el dispositivo UBOX est\u00e1n fuera de l\u00ednea. Eliminar la comprobaci\u00f3n WARN_ON_ONCE(die_id == -1) por dos razones: - El c\u00f3digo actual sale del bucle. Esto es incorrecto porque pci_get_device() no garantiza la iteraci\u00f3n en orden de dominio o de bus, por lo que se pueden omitir dispositivos UBOX adicionales durante el escaneo. - Devolver -EINVAL es incorrecto, ya que marcar los buses fuera de l\u00ednea con die_id == -1 es lo esperado y no debe tratarse como un error. Por separado, cuando NUMA est\u00e1 deshabilitado en una plataforma compatible con NUMA, pcibus_to_node() devuelve NUMA_NO_NODE, lo que hace que uncore_device_to_die() devuelva -1 para todos los dispositivos PCI. Como resultado, spr_update_device_location(), utilizado en Intel SPR y EMR, ignora las unidades PMON correspondientes y no las a\u00f1ade al \u00e1rbol RB. Solucionar esto utilizando uncore_pcibus_to_dieid(), que recupera la topolog\u00eda del registro UBOX GIDNIDMAP y funciona independientemente de si NUMA est\u00e1 habilitado en Linux. Esto requiere que snbep_pci2phy_map_init() se a\u00f1ada en spr_uncore_pci_init(). Mantener uncore_device_to_die() solo para el caso nr_node_ids mayor que 8, donde se espera que NUMA est\u00e9 habilitado."
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        "id": "CVE-2026-43344",
        "lastModified": "2026-11-11T20:10:00.273",
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-06T15:36:08.657780Z",
                "version": "2.0.3"
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        "vulnStatus": "Modified",
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                "value": "CWE-617"
              }
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            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-11-06T18:31:45+00:00",
      "cve": "CVE-2026-43344",
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      "product_status:known_affected": "158",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf/x86/intel/uncore: Fix die ID init and look up bugs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43344.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-11-01T01:00:19Z",
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      "id": "CVE-2026-43344",
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      "product_status:known_affected": "247",
      "product_status:known_not_affected": "125",
      "product_status:recommended": "203",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43344",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-43344.json",
      "version": "9"
    },
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            },
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        ],
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        "datePublished": "2026-05-08T13:39:30.537Z",
        "dateReserved": "2026-05-01T14:12:56.003Z",
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  }
}



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Sightings

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