CVE-2026-64075 (GCVE-0-2026-64075)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-07-19 15:39
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4346ba1604093305a287e08eb465a9c15ba05b80
Version: 4346ba1604093305a287e08eb465a9c15ba05b80
Version: 4346ba1604093305a287e08eb465a9c15ba05b80
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/fprobe.h",
            "kernel/trace/bpf_trace.c",
            "kernel/trace/fprobe.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "56b4cfcf1518245493c60fd39c56978f508f1816",
              "status": "affected",
              "version": "4346ba1604093305a287e08eb465a9c15ba05b80",
              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
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            "kernel/trace/fprobe.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
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                {
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
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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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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