FKIE_CVE-2026-80642

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/725ada0273a0f48a67fd59cc518d7f8055fe3d5c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8e47bd066d7e626f9f45d416182d585b7e18b9b
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/liveupdate.h",
            "kernel/liveupdate/luo_flb.c",
            "lib/tests/liveupdate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "725ada0273a0f48a67fd59cc518d7f8055fe3d5c",
              "status": "affected",
              "version": "cab056f2aae7250af50e503b81a80dfc567a1acd",
              "versionType": "git"
            },
            {
              "lessThan": "d8e47bd066d7e626f9f45d416182d585b7e18b9b",
              "status": "affected",
              "version": "cab056f2aae7250af50e503b81a80dfc567a1acd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/liveupdate.h",
            "kernel/liveupdate/luo_flb.c",
            "lib/tests/liveupdate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nliveupdate: Reference count incoming FLB data\n\nIncrement the incoming FLB refcount in liveupdate_flb_get_incoming() so\nthat the FLB structure cannot be freed while the caller is actively using\nit. Add an additional liveupdate_flb_put_incoming() function so the\ncaller can explicitly indicate when it is done using the FLB data.\n\nDuring a Live Update, a subsystem might need to hold onto the incoming\nFile-Lifecycle-Bound (FLB) data for an extended period, such as during\ndevice enumeration. Incrementing the reference count guarantees that the\ndata remains valid and accessible until the subsystem releases it,\npreventing future use-after-free bugs."
    }
  ],
  "id": "CVE-2026-80642",
  "lastModified": "2026-08-28T08:16:49.097",
  "metrics": {},
  "published": "2026-08-28T08:16:49.097",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/725ada0273a0f48a67fd59cc518d7f8055fe3d5c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d8e47bd066d7e626f9f45d416182d585b7e18b9b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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