CVE-2026-98777 (GCVE-0-2026-98777)
Vulnerability from cvelistv5
Published
2026-10-18 15:48
Modified
2026-10-21 12:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix leaked fd fixups on TF_UPDATE_TXN supersede When a TF_UPDATE_TXN transaction supersedes a pending async transaction in a frozen process, the outdated transaction is freed with kfree() directly. This skips binder_free_txn_fixups(), leaking all binder_txn_fd_fixup entries and their fget()'d struct file references. The leaked file refcounts never reach zero, so the struct file objects are permanently pinned in memory. They survive process exit and accumulate across invocations until file-max exhaustion. Every other transaction cleanup path (binder_free_transaction(), binder_transaction() error paths, binder_release_work()) correctly calls binder_free_txn_fixups(). Add the missing call before kfree() in the t_outdated cleanup block.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9864bb4801331daa48514face9d0f4861e4d485b
Version: 9864bb4801331daa48514face9d0f4861e4d485b
Version: 9864bb4801331daa48514face9d0f4861e4d485b
Version: 9864bb4801331daa48514face9d0f4861e4d485b
Version: 9864bb4801331daa48514face9d0f4861e4d485b
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/binder.c"
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          "versions": [
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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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\nbinder: fix leaked fd fixups on TF_UPDATE_TXN supersede\n\nWhen a TF_UPDATE_TXN transaction supersedes a pending async transaction\nin a frozen process, the outdated transaction is freed with kfree()\ndirectly. This skips binder_free_txn_fixups(), leaking all\nbinder_txn_fd_fixup entries and their fget()\u0027d struct file references.\n\nThe leaked file refcounts never reach zero, so the struct file objects\nare permanently pinned in memory. They survive process exit and\naccumulate across invocations until file-max exhaustion.\n\nEvery other transaction cleanup path (binder_free_transaction(),\nbinder_transaction() error paths, binder_release_work()) correctly\ncalls binder_free_txn_fixups(). Add the missing call before kfree()\nin the t_outdated cleanup block."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:56:50.708Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a7329ea53d04f0c6135d02905810cd6f42acdf45"
        },
        {
          "url": "https://git.kernel.org/stable/c/7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55"
        },
        {
          "url": "https://git.kernel.org/stable/c/1299cb3fb061598496086fc87ff291057831148e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6673f4f21e2fddfed0abe1eb9045cc958e6db130"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4c02084d6687d5cd5edccaf52cc45e5160f1184"
        }
      ],
      "title": "binder: fix leaked fd fixups on TF_UPDATE_TXN supersede",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98777",
    "datePublished": "2026-10-18T15:48:13.993Z",
    "dateReserved": "2026-09-25T10:25:14.369Z",
    "dateUpdated": "2026-10-21T12:56:50.708Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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