CVE-2026-89443

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Validate level in perf mask ioctls isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the user-provided level as an index into perf_levels[] via _read_pp_level_info() and _read_bf_level_info(), but neither helper validates it first. The adjacent level-info helpers reject levels above max_level before reading the same per-level register block. Add the same bounds checks to the mask helpers, and reject disabled SST-PP levels in isst_if_get_perf_level_mask() to match isst_if_get_perf_level_info(). This prevents out-of-bounds reads from the per-level offset table on invalid ioctl input.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01
https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e
https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538
https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68
https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89443

Mitre link : CVE-2026-89443

CVE.ORG link : CVE-2026-89443

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89443", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829", "lessThan": "beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68", "versionType": "git"}, {"status": "affected", "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829", "lessThan": "1a8bab5ceee1a42a78de12d3d69f67516a20588e", "versionType": "git"}, {"status": "affected", "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829", "lessThan": "1889a9156553f0692acd57caf15e877baace1a01", "versionType": "git"}, {"status": "affected", "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829", "lessThan": "d19385624bdfb577db9c94bb8879992fd5e17bcd", "versionType": "git"}, {"status": "affected", "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829", "lessThan": "80e0d353c86a9a168ad6d213f494796294381538", "versionType": "git"}], "programFiles": ["drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"status": "unaffected", "version": "0", "lessThan": "6.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:24.737", "references": [{"url": "https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate level in perf mask ioctls\n\nisst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the\nuser-provided level as an index into perf_levels[] via\n_read_pp_level_info() and _read_bf_level_info(), but neither helper\nvalidates it first.\n\nThe adjacent level-info helpers reject levels above max_level before\nreading the same per-level register block. Add the same bounds checks to\nthe mask helpers, and reject disabled SST-PP levels in\nisst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().\n\nThis prevents out-of-bounds reads from the per-level offset table on\ninvalid ioctl input."}], "lastModified": "2026-09-14T13:19:01.547", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}