Vulnerability-Lookup

GHSA-8MPP-JF4M-XX27

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53095"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:23Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-8mpp-jf4m-xx27",
  "modified": "2026-06-24T18:32:46Z",
  "published": "2026-06-24T18:32:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53095"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30

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

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b312cf41b9e43f442…
https://git.kernel.org/stable/c/9836cadbd96c7e0db…
https://git.kernel.org/stable/c/611fe4b79af72d00d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < b312cf41b9e43f442613053f6cad39898e1baf96 (git) Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < 9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8 (git) Affected: 7384893d970ea114952aef54ad7e3d7d2ca82d4f , < 611fe4b79af72d00d80f2223354284447daafae9 (git)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b312cf41b9e43f442613053f6cad39898e1baf96",
              "status": "affected",
              "version": "7384893d970ea114952aef54ad7e3d7d2ca82d4f",
              "versionType": "git"
            },
            {
              "lessThan": "9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8",
              "status": "affected",
              "version": "7384893d970ea114952aef54ad7e3d7d2ca82d4f",
              "versionType": "git"
            },
            {
              "lessThan": "611fe4b79af72d00d80f2223354284447daafae9",
              "status": "affected",
              "version": "7384893d970ea114952aef54ad7e3d7d2ca82d4f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "6.18",
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                },
                {
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
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          "url": "https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96"
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        {
          "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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    "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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GHSA-8MPP-JF4M-XX27

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

Tags

Sightings

Nomenclature