CVE-2026-90247 (GCVE-0-2026-90247)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-30 12:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix mmap_lock leak in irq_work path stack_map_get_build_id_offset() introduced a per-CPU irq_work to defer mmap_read_unlock() from NMI context, and bpf_find_vma() later reused the same mmap_unlock_work. Both callers only check whether the work is busy before taking mmap_lock, so a nested caller can reuse the slot before the first caller queues it. Two read locks may then be acquired while only one deferred unlock runs, leaking a read lock and blocking exit_mmap(). Reserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper in stackmap and bpf_find_vma() so both callers release the reservation on trylock failure. Keep rejecting the slot while the irq_work remains busy. Release it after the irq_work callback unlocks the mm.
References
Impacted products
Vendor Product Version
Linux Linux Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: eac9153f2b584c702cea02c1f1a57d85aa9aea42
Version: a7f4da875c16f3b8bef0d9ec67528111045bfcd8
Version: f1838da73cccb238b8be4ef464fce0168dc7ba84
Version: 4.19.92   ≤
Version: 5.4.7   ≤
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "kernel/bpf/mmap_unlock_work.h",
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          "vendor": "Linux",
          "versions": [
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix mmap_lock leak in irq_work path\n\nstack_map_get_build_id_offset() introduced a per-CPU irq_work to defer\nmmap_read_unlock() from NMI context, and bpf_find_vma() later reused the\nsame mmap_unlock_work. Both callers only check whether the work is busy\nbefore taking mmap_lock, so a nested caller can reuse the slot before the\nfirst caller queues it. Two read locks may then be acquired while only one\ndeferred unlock runs, leaking a read lock and blocking exit_mmap().\n\nReserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper\nin stackmap and bpf_find_vma() so both callers release the reservation on\ntrylock failure. Keep rejecting the slot while the irq_work remains busy.\nRelease it after the irq_work callback unlocks the mm."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:34:55.059Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d6d091873e12d1de36d7228c4f452e6cace3a23e"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8"
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          "url": "https://git.kernel.org/stable/c/931f62311c058d79f29548f20943969bb441ce87"
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          "url": "https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20"
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        {
          "url": "https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1"
        }
      ],
      "title": "bpf: Fix mmap_lock leak in irq_work path",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90247",
    "datePublished": "2026-09-17T16:07:49.444Z",
    "dateReserved": "2026-09-11T19:38:34.795Z",
    "dateUpdated": "2026-10-30T12:34:55.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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