CVE-2026-80642 (GCVE-0-2026-80642)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
liveupdate: Reference count incoming FLB data
Summary
In the Linux kernel, the following vulnerability has been resolved: liveupdate: Reference count incoming FLB data Increment the incoming FLB refcount in liveupdate_flb_get_incoming() so that the FLB structure cannot be freed while the caller is actively using it. Add an additional liveupdate_flb_put_incoming() function so the caller can explicitly indicate when it is done using the FLB data. During a Live Update, a subsystem might need to hold onto the incoming File-Lifecycle-Bound (FLB) data for an extended period, such as during device enumeration. Incrementing the reference count guarantees that the data remains valid and accessible until the subsystem releases it, preventing future use-after-free bugs.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cab056f2aae7250af50e503b81a80dfc567a1acd , < 725ada0273a0f48a67fd59cc518d7f8055fe3d5c (git)
Affected: cab056f2aae7250af50e503b81a80dfc567a1acd , < d8e47bd066d7e626f9f45d416182d585b7e18b9b (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "include/linux/liveupdate.h",
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      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:53.841Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d8e47bd066d7e626f9f45d416182d585b7e18b9b"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80642",
    "datePublished": "2026-08-28T06:48:53.841Z",
    "dateReserved": "2026-08-26T14:34:25.778Z",
    "dateUpdated": "2026-08-28T06:48:53.841Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:15:04+00:00",
      "cve": "CVE-2026-80642",
      "id": "CVE-2026-80642",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: liveupdate: Reference count incoming FLB data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80642.json",
      "version": "3"
    }
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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