CVE Catalog

CVE-2026-80927

Low risk· EPSS 10%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.21%

10th percentile - higher than 10% of all known CVEs

Summary

In the Linux kernel, __do_adjtimex() did not check the return value of tk_get_aux_ts64. If the auxiliary clock is disabled during tk_get_aux_ts64() but enabled before tks->clock_valid is checked, uninitialized stack data is used in calculations and indirectly leaked to userspace.

Risk Assessment

Disclosure of uninitialized stack data to userspace may lead to kernel information leakage. It requires a race condition involving the auxiliary clock.

Recommendation

Update the Linux kernel to a version with the fix that checks the return value of tk_get_aux_ts64 in __do_adjtimex().

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS