CVE-2026-64075 (GCVE-0-2026-64075)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
fprobe: Fix unregister_fprobe() to wait for RCU grace period
Summary
In the Linux kernel, the following vulnerability has been resolved: fprobe: Fix unregister_fprobe() to wait for RCU grace period Commit 4346ba1604093 ("fprobe: Rewrite fprobe on function-graph tracer") changed fprobe to register struct fprobe to an rcu-hlist, but it forgot to wait for RCU GP. Thus there can be use-after-free if the fprobe is released right after unregistering. This can be happened on fprobe event and sample module code. To fix this issue, add synchronize_rcu() in unregister_fprobe(). Note that BPF is OK because fprobe is used as a part of bpf_kprobe_multi_link. This unregisters its fprobe in bpf_kprobe_multi_link_release() and it is deallocated via bpf_kprobe_multi_link_dealloc(), which is invoked from bpf_link_defer_dealloc_rcu_gp() RCU callback. For BPF, this also introduced unregister_fprobe_async() which does NOT wait for RCU grace priod.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < 56b4cfcf1518245493c60fd39c56978f508f1816 (git)
Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < a4f6a9005ed6cfd360ef2520430927f05f92ffb0 (git)
Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < 657b594b2084b39a4bc6d8493aa2140cb00cea49 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "include/linux/fprobe.h",
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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\nfprobe: Fix unregister_fprobe() to wait for RCU grace period\n\nCommit 4346ba1604093 (\"fprobe: Rewrite fprobe on function-graph tracer\")\nchanged fprobe to register struct fprobe to an rcu-hlist, but it forgot\nto wait for RCU GP. Thus there can be use-after-free if the fprobe is\nreleased right after unregistering. This can be happened on fprobe\nevent and sample module code.\n\nTo fix this issue, add synchronize_rcu() in unregister_fprobe().\n\nNote that BPF is OK because fprobe is used as a part of\nbpf_kprobe_multi_link. This unregisters its fprobe in\nbpf_kprobe_multi_link_release() and it is deallocated via\nbpf_kprobe_multi_link_dealloc(), which is invoked from\nbpf_link_defer_dealloc_rcu_gp() RCU callback.\n\nFor BPF, this also introduced unregister_fprobe_async() which does\nNOT wait for RCU grace priod."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:39:49.679Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/56b4cfcf1518245493c60fd39c56978f508f1816"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4f6a9005ed6cfd360ef2520430927f05f92ffb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/657b594b2084b39a4bc6d8493aa2140cb00cea49"
        }
      ],
      "title": "fprobe: Fix unregister_fprobe() to wait for RCU grace period",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64075",
    "datePublished": "2026-07-19T15:39:49.679Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-07-19T15:39:49.679Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-07-21",
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      "percentile": "0.06191"
    },
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T07:52:24+00:00",
      "cve": "CVE-2026-64075",
      "id": "CVE-2026-64075",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fprobe: Fix unregister_fprobe() to wait for RCU grace period",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64075.json",
      "version": "3"
    }
  }
}



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