NVD / CVE Program· CNA Linux

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

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 13a779de4175df602366d129e41782ad7168cef0, 337b1546cde87fb8588ddaedf0201b769baa572a, dbdf22fc825fdb1d97f23230064e0f9819471628.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 13a779de4175df602366d129e41782ad7168cef0, 337b1546cde87fb8588ddaedf0201b769baa572a, dbdf22fc825fdb1d97f23230064e0f9819471628 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

BDU:2025-02867

Published: Feb 27, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 12th percentile
CWE: CWE-190

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel5.10.0 and later · before 5.10.36
linux linux kernel5.11.0 and later · before 5.11.20
linux linux kernel5.12.0 and later · before 5.12.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.10affected
- 9972d5d84d76982606806b2ce887f70c2f8ba60a and later · before ea6803ff2cd1a2d7d880256bf562172b708a76ffaffected · git
- 9972d5d84d76982606806b2ce887f70c2f8ba60a and later · before dbdf22fc825fdb1d97f23230064e0f9819471628affected · git
- 9972d5d84d76982606806b2ce887f70c2f8ba60a and later · before 337b1546cde87fb8588ddaedf0201b769baa572aaffected · git
- 9972d5d84d76982606806b2ce887f70c2f8ba60a and later · before 13a779de4175df602366d129e41782ad7168cef0affected · git
- before 5.10not affected · semver
- 5.10.36 and later · up to and including 5.10.*not affected · semver
- 5.11.20 and later · up to and including 5.11.*not affected · semver
- 5.12.3 and later · up to and including 5.12.*not affected · semver
- 5.13 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.10.38-1	5.10.38-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2021-46938Feb 27, 2024 · dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
31Monitor
← EarlierCVE-2021-46939Feb 27, 2024 · tracing: Restructure trace_clock_global() to never block
22Monitor
Later →CVE-2021-46941Feb 27, 2024 · usb: dwc3: core: Do core softreset when switch mode
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	13a779de4175df602366d129e41782ad7168cef0	Vendor (CNA)
Linux Linux	337b1546cde87fb8588ddaedf0201b769baa572a	Vendor (CNA)
Linux Linux	dbdf22fc825fdb1d97f23230064e0f9819471628	Vendor (CNA)
Linux Linux	ea6803ff2cd1a2d7d880256bf562172b708a76ff	Vendor (CNA)
debian:linux	5.10.38-1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2023-0179337 days apartA buffer overflow vulnerability was found in the Netfilter subsystem in the Linux Kernel.
32Monitor
CVE-2021-470986 days aparthwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations
31Monitor
CVE-2024-2330733 days apartInteger overflow in raid5_cache_count in Linux kernel
31Monitor
CVE-2024-40994136 days apartptp: fix integer overflow in max_vclocks_store
31Monitor
CVE-2024-41000136 days apartblock/ioctl: prefer different overflow check
31Monitor
CVE-2022-48837140 days apartusb: gadget: rndis: prevent integer overflow in rndis_set_response()
31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).