CVE-2026-43344 (GCVE-0-2026-43344)
Vulnerability from cvelistv5
Published
2026-05-08 13:39
Modified
2026-09-14 11:58
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
Version: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
Version: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
Version: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
Version: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/intel/uncore.c",
            "arch/x86/events/intel/uncore_snbep.c"
          ],
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            }
          ]
        },
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/intel/uncore.c",
            "arch/x86/events/intel/uncore_snbep.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.6.157",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
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                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel/uncore: Fix die ID init and look up bugs\n\nIn snbep_pci2phy_map_init(), in the nr_node_ids \u003e 8 path,\nuncore_device_to_die() may return -1 when all CPUs associated\nwith the UBOX device are offline.\n\nRemove the WARN_ON_ONCE(die_id == -1) check for two reasons:\n\n- The current code breaks out of the loop. This is incorrect because\n  pci_get_device() does not guarantee iteration in domain or bus order,\n  so additional UBOX devices may be skipped during the scan.\n\n- Returning -EINVAL is incorrect, since marking offline buses with\n  die_id == -1 is expected and should not be treated as an error.\n\nSeparately, when NUMA is disabled on a NUMA-capable platform,\npcibus_to_node() returns NUMA_NO_NODE, causing uncore_device_to_die()\nto return -1 for all PCI devices.  As a result,\nspr_update_device_location(), used on Intel SPR and EMR, ignores the\ncorresponding PMON units and does not add them to the RB tree.\n\nFix this by using uncore_pcibus_to_dieid(), which retrieves topology\nfrom the UBOX GIDNIDMAP register and works regardless of whether NUMA\nis enabled in Linux.  This requires snbep_pci2phy_map_init() to be\nadded in spr_uncore_pci_init().\n\nKeep uncore_device_to_die() only for the nr_node_ids \u003e 8 case, where\nNUMA is expected to be enabled."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:58:20.422Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/184870af0e73f8ea2577c751fa098681465249f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdb35811ff41a1678620a407056b6372f350028a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c79ef3342632e71ac8612a2a1cc17ac84dd258b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a5dc3ee97581da2907fc7acd62853f07184de67"
        },
        {
          "url": "https://git.kernel.org/stable/c/a16d1ec4dd0cdcf689f324adde6067083bce9099"
        }
      ],
      "title": "perf/x86/intel/uncore: Fix die ID init and look up bugs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43344",
    "datePublished": "2026-05-08T13:39:30.537Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-09-14T11:58:20.422Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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