CVE-2026-43344 (GCVE-0-2026-43344)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:39 – Updated: 2026-09-14 11:58
VLAI
EPSS
VEX
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
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < 184870af0e73f8ea2577c751fa098681465249f2
(git)
Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < bdb35811ff41a1678620a407056b6372f350028a (git) Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < c79ef3342632e71ac8612a2a1cc17ac84dd258b4 (git) Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < 6a5dc3ee97581da2907fc7acd62853f07184de67 (git) Affected: 9a7832ce3d920426a36cdd78eda4b3568d4d09e3 , < a16d1ec4dd0cdcf689f324adde6067083bce9099 (git) |
guessed | |
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (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 |
{
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{
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"cpeApplicability": [
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"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."
}
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"url": "https://git.kernel.org/stable/c/bdb35811ff41a1678620a407056b6372f350028a"
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"url": "https://git.kernel.org/stable/c/c79ef3342632e71ac8612a2a1cc17ac84dd258b4"
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"url": "https://git.kernel.org/stable/c/6a5dc3ee97581da2907fc7acd62853f07184de67"
},
{
"url": "https://git.kernel.org/stable/c/a16d1ec4dd0cdcf689f324adde6067083bce9099"
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],
"title": "perf/x86/intel/uncore: Fix die ID init and look up bugs",
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"datePublished": "2026-05-08T13:39:30.537Z",
"dateReserved": "2026-05-01T14:12:56.003Z",
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"id": "msrc_CVE-2026-43344",
"initial_release_date": "2026-05-09T01:02:52.000Z",
"product_status:known_affected": "7",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "perf/x86/intel/uncore: Fix die ID init and look up bugs",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43344.json",
"version": "10"
},
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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 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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T07:37:02+00:00",
"cve": "CVE-2026-43344",
"id": "CVE-2026-43344",
"initial_release_date": "2026-05-08T00:00:00+00:00",
"product_status:known_affected": "232",
"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": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:18:29Z",
"cve": "CVE-2026-43344",
"id": "CVE-2026-43344",
"initial_release_date": "2026-05-13T03:35:05Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "245",
"product_status:known_not_affected": "125",
"product_status:recommended": "145",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43344",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43344.json",
"version": "6"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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