CVE-2026-98058 (GCVE-0-2026-98058)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-21 12:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Mark syscall helpers as sleepable bpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes, allocate with GFP_KERNEL, and wait for an RCU grace period. bpf_sys_close() reaches close_fd() and filp_close(), which can sleep as well. Both helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is sleepable. That does not make every callback sleepable: a syscall program can register a bpf_timer callback, and the verifier checks that callback in a non-sleepable context while retaining the syscall helper set. Without .might_sleep on the prototypes, such a callback can invoke bpf_sys_bpf() from hrtimer softirq context and trigger a scheduling-while-atomic failure. bpf_sys_close() is exposed through the same missing context check. Set .might_sleep on both prototypes so the existing helper-context check rejects them from timer callbacks and other atomic regions. Calls from the sleepable main body remain valid.
References
Impacted products
Vendor Product Version
Linux Linux Version: 79a7f8bdb159d9914b58740f3d31d602a6e4aca8
Version: 79a7f8bdb159d9914b58740f3d31d602a6e4aca8
Version: 79a7f8bdb159d9914b58740f3d31d602a6e4aca8
Version: 79a7f8bdb159d9914b58740f3d31d602a6e4aca8
Version: 79a7f8bdb159d9914b58740f3d31d602a6e4aca8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
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              "lessThanOrEqual": "*",
              "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\nbpf: Mark syscall helpers as sleepable\n\nbpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes,\nallocate with GFP_KERNEL, and wait for an RCU grace period.\nbpf_sys_close() reaches close_fd() and filp_close(), which can sleep as\nwell.\n\nBoth helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is\nsleepable. That does not make every callback sleepable: a syscall program\ncan register a bpf_timer callback, and the verifier checks that callback\nin a non-sleepable context while retaining the syscall helper set.\n\nWithout .might_sleep on the prototypes, such a callback can invoke\nbpf_sys_bpf() from hrtimer softirq context and trigger a\nscheduling-while-atomic failure. bpf_sys_close() is exposed through the\nsame missing context check.\n\nSet .might_sleep on both prototypes so the existing helper-context check\nrejects them from timer callbacks and other atomic regions. Calls from the\nsleepable main body remain valid."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:54:19.435Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9496d857205e60241034b798d7745ff8830ba599"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8cfe9f71d302970ae393616960f2b3021d2b3b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/65f636322ac402add6046c68e9ece77b9ffd71c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/3408e98f06ce06ea6a58ca6c39da9c23f0029c06"
        },
        {
          "url": "https://git.kernel.org/stable/c/d05524794240b52fdc3b6c1220dd05505715824d"
        }
      ],
      "title": "bpf: Mark syscall helpers as sleepable",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98058",
    "datePublished": "2026-09-25T10:24:04.190Z",
    "dateReserved": "2026-09-25T10:19:56.072Z",
    "dateUpdated": "2026-10-21T12:54:19.435Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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