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

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.

Timeline

  1. ID reserved

    By Linux

  2. · 16 days later

    Published

  3. · 38 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)
0.21% · top 89% of all CVEs (14 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 – < fecf1e37775269ad38c172b468ad4ecc3968aa63
    • affected 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 – < bc59dac50cb45a725f7a50760c7cc72a0964f722
    • affected 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 – < 4b61084b11bcecce86d03804ff30f8d7b465593c

  • Linux · Linux

    • affected 6.17
    • unaffected < 6.17
    • unaffected 6.18.50 – ≤ 6.18.*
    • unaffected 7.2.4 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .