What’s Vulnerable › Vulnerabilities

CVE-2021-46940: tools/power turbostat: Fix offset overflow issue in index converting

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-06-17
• Weakness: CWE-190

Description

In the Linux kernel, the following vulnerability has been resolved: tools/power turbostat: Fix offset overflow issue in index converting The idx_to_offset() function returns type int (32-bit signed), but MSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number. The end result is that it hits the if (offset < 0) check in update_msr_sum() which prevents the timer callback from updating the stat in the background when long durations are used. The similar issue exists in offset_to_idx() and update_msr_sum(). Fix this issue by converting the 'int' to 'off_t' accordingly.

Affected products

• Linux kernel: from 5.10.0 before 5.10.36; from 5.11.0 before 5.11.20; from 5.12.0 before 5.12.3 — fixed in 5.10.36, 5.11.20, 5.12.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.36, 5.11.20, 5.12.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0
• https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a
• https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628
• https://git.kernel.org/stable/c/ea6803ff2cd1a2d7d880256bf562172b708a76ff
• https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0
• https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a
• https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628
• https://git.kernel.org/stable/c/ea6803ff2cd1a2d7d880256bf562172b708a76ff

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