CVE-2026-98045 (GCVE-0-2026-98045)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Mark faultable stack helpers as sleepable The faultable variants of bpf_get_stack() and bpf_get_task_stack() pass may_fault=true into the common stack collection code. Resolving user-space build IDs may then call build_id_parse_file() and block on filesystem reads. Neither helper prototype sets might_sleep. Since prototype selection uses the sleepability of the whole program, the verifier can still allow these helpers from a non-sleepable region within that program, such as an explicit RCU or preemption-disabled region. The task-stack helper can also be called from a non-sleepable timer callback of a sleepable program. Mark both faultable prototypes as sleepable. The existing helper context check then rejects these calls while continuing to allow them in genuinely sleepable contexts.
References
Impacted products
Vendor Product Version
Linux Linux Version: d4dd9775ec242425576af93daadb80a34083a53c
Version: d4dd9775ec242425576af93daadb80a34083a53c
Version: d4dd9775ec242425576af93daadb80a34083a53c
Version: d4dd9775ec242425576af93daadb80a34083a53c
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/stackmap.c"
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          "vendor": "Linux",
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              "versionType": "semver"
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark faultable stack helpers as sleepable\n\nThe faultable variants of bpf_get_stack() and bpf_get_task_stack() pass\nmay_fault=true into the common stack collection code. Resolving user-space\nbuild IDs may then call build_id_parse_file() and block on filesystem\nreads.\n\nNeither helper prototype sets might_sleep. Since prototype selection uses\nthe sleepability of the whole program, the verifier can still allow these\nhelpers from a non-sleepable region within that program, such as an\nexplicit RCU or preemption-disabled region. The task-stack helper can also\nbe called from a non-sleepable timer callback of a sleepable program.\n\nMark both faultable prototypes as sleepable. The existing helper context\ncheck then rejects these calls while continuing to allow them in genuinely\nsleepable contexts."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:51.065Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/44b8d370f2725bad215da3e67668e98ba96671bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/3014e8a8bdad55075d89836ad9c10710a9a69837"
        },
        {
          "url": "https://git.kernel.org/stable/c/19e8d5a98afd071d8c1c5adeccf92b3c42eddc70"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d02927fdf4e930893c92e35fed01a2704496900"
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      ],
      "title": "bpf: Mark faultable stack helpers as sleepable",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98045",
    "datePublished": "2026-09-25T10:23:56.089Z",
    "dateReserved": "2026-09-25T10:19:56.071Z",
    "dateUpdated": "2026-10-19T09:12:51.065Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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