timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex() (CVE-2026-80927) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80927

timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex()

Answer in brief

CVE-2026-80927 records a Unknown severity vulnerability in timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=4eca49d0b621b314ac7c80f363932ec6f6c8abc8 <fecf1e37775269ad38c172b468ad4ecc3968aa63 \|\| >=4eca49d0b621b314ac7c80f363932ec6f6c8abc8 <bc59dac50cb45a725f7a50760c7cc72a0964f722 \|\| >=4eca49d0b621b314ac7c80f363932ec6f6c8abc8 <4b61084b11bcecce86d03804ff30f8d7b465593c	fecf1e37775269ad38c172b468ad4ecc3968aa63, bc59dac50cb45a725f7a50760c7cc72a0964f722, 4b61084b11bcecce86d03804ff30f8d7b465593c
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to fecf1e37775269ad38c172b468ad4ecc3968aa63 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex() If the auxiliary clock is disabled during tk_get_aux_ts64() but is enabled before tks->clock_valid is checked, then uninitialized stackdata will be used in the calculations and indirectly leaked to userspace. The same race window also exists after this change and also for the core timekeeper. But in these cases the only effect would be incorrect adjustments and this is userspace's responsibility to avoid this.

Quoted source text, attributed separately from HOL analysis.