CVE-2026-53095 (GCVE-0-2026-53095)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
bpf: Fix abuse of kprobe_write_ctx via freplace
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix abuse of kprobe_write_ctx via freplace uprobe programs are allowed to modify struct pt_regs. Since the actual program type of uprobe is KPROBE, it can be abused to modify struct pt_regs via kprobe+freplace when the kprobe attaches to kernel functions. For example, SEC("?kprobe") int kprobe(struct pt_regs *regs) { return 0; } SEC("?freplace") int freplace_kprobe(struct pt_regs *regs) { regs->di = 0; return 0; } freplace_kprobe prog will attach to kprobe prog. kprobe prog will attach to a kernel function. Without this patch, when the kernel function runs, its first arg will always be set as 0 via the freplace_kprobe prog. To fix the abuse of kprobe_write_ctx=true via kprobe+freplace, disallow attaching freplace programs on kprobe programs with different kprobe_write_ctx values.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < b312cf41b9e43f442613053f6cad39898e1baf96 (git)
Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < 9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8 (git)
Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < 611fe4b79af72d00d80f2223354284447daafae9 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
          ],
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          "vendor": "Linux",
          "versions": [
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      "cpeApplicability": [
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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: Fix abuse of kprobe_write_ctx via freplace\n\nuprobe programs are allowed to modify struct pt_regs.\n\nSince the actual program type of uprobe is KPROBE, it can be abused to\nmodify struct pt_regs via kprobe+freplace when the kprobe attaches to\nkernel functions.\n\nFor example,\n\nSEC(\"?kprobe\")\nint kprobe(struct pt_regs *regs)\n{\n\treturn 0;\n}\n\nSEC(\"?freplace\")\nint freplace_kprobe(struct pt_regs *regs)\n{\n\tregs-\u003edi = 0;\n\treturn 0;\n}\n\nfreplace_kprobe prog will attach to kprobe prog.\nkprobe prog will attach to a kernel function.\n\nWithout this patch, when the kernel function runs, its first arg will\nalways be set as 0 via the freplace_kprobe prog.\n\nTo fix the abuse of kprobe_write_ctx=true via kprobe+freplace, disallow\nattaching freplace programs on kprobe programs with different\nkprobe_write_ctx values."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:30:33.684Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96"
        },
        {
          "url": "https://git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9"
        }
      ],
      "title": "bpf: Fix abuse of kprobe_write_ctx via freplace",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53095",
    "datePublished": "2026-06-24T16:30:33.684Z",
    "dateReserved": "2026-06-09T07:44:35.384Z",
    "dateUpdated": "2026-06-24T16:30:33.684Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-07-02",
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      "percentile": "0.06148"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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