In the Linux kernel, the following vulnerability has been resolved:
platform/x86: ISST: Validate logical CPU id and clos id
Validate max CLOS ID and logical CPU ID for core power feature.
Reject any clos level or logical CPU number greater than the
supported maximum. These are used to calculate MMIO offset.
CVE-2026-89438
NONE
EPSS 0.21%
Updated Sep 14, 2026
Linux
https://git.kernel.org/stable/c/124e2dbabe460c2a6e7440f4ad8af560131295c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/5b032e1dda486ca41d10536bd195bd8a559af1e2
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/82d4afadb02fb4d7d7bb9230900904c10e49ec87
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c9ee2770eb95ba316a56d776b2b66666b70c194b
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/0d601126c7afda9bb94dfecc8b2c0a16f20d76cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVE Details
CVE ID
CVE-2026-89438
Published Date
Sep 11, 2026
Vendor
Linux
Severity
NONE
Exploit Prediction (EPSS)
Probability of Exploit
0.21%
Likelihood of exploitation in next 30 days
Percentile:
9.6th percentile (higher than 9.6% of all CVEs)
Standard patching cycle
Impact
Minimal impact
Source
View Advisory