Vulnerability-Lookup

GHSA-G365-RM76-M26C

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80927"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:18:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntimekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex()\n\nIf the auxiliary clock is disabled during tk_get_aux_ts64() but is enabled\nbefore tks-\u003eclock_valid is checked, then uninitialized stackdata will be\nused in the calculations and indirectly leaked to userspace.\n\nThe same race window also exists after this change and also for the core\ntimekeeper. But in these cases the only effect would be incorrect\nadjustments and this is userspace\u0027s responsibility to avoid this.",
  "id": "GHSA-g365-rm76-m26c",
  "modified": "2026-09-11T21:31:19Z",
  "published": "2026-09-11T21:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80927"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b61084b11bcecce86d03804ff30f8d7b465593c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc59dac50cb45a725f7a50760c7cc72a0964f722"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fecf1e37775269ad38c172b468ad4ecc3968aa63"
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  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80927 (GCVE-0-2026-80927)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-11 19:42

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/fecf1e37775269ad3…
https://git.kernel.org/stable/c/bc59dac50cb45a725…
https://git.kernel.org/stable/c/4b61084b11bcecce8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 , < fecf1e37775269ad38c172b468ad4ecc3968aa63 (git) Affected: 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 , < bc59dac50cb45a725f7a50760c7cc72a0964f722 (git) Affected: 4eca49d0b621b314ac7c80f363932ec6f6c8abc8 , < 4b61084b11bcecce86d03804ff30f8d7b465593c (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/time/timekeeping.c"
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            {
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              "status": "affected",
              "version": "4eca49d0b621b314ac7c80f363932ec6f6c8abc8",
              "versionType": "git"
            }
          ]
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          "versions": [
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              "version": "6.17"
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              "versionType": "semver"
            },
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        }
      ],
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                  "versionStartIncluding": "6.17",
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                }
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntimekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex()\n\nIf the auxiliary clock is disabled during tk_get_aux_ts64() but is enabled\nbefore tks-\u003eclock_valid is checked, then uninitialized stackdata will be\nused in the calculations and indirectly leaked to userspace.\n\nThe same race window also exists after this change and also for the core\ntimekeeper. But in these cases the only effect would be incorrect\nadjustments and this is userspace\u0027s responsibility to avoid this."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:42:03.257Z",
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        {
          "url": "https://git.kernel.org/stable/c/4b61084b11bcecce86d03804ff30f8d7b465593c"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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