Vulnerability-Lookup

GHSA-6HG3-QQFJ-F5WW

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Preserve pointer state for commuted arithmetic

When scalar += pointer is handled in adjust_ptr_min_max_vals(), the destination register inherits the pointer state from the source pointer. Copying only selected fields is fragile because pointer provenance is tracked by several bpf_reg_state fields.

Use the caller's temporary offset register to preserve the scalar operand while replacing the destination with the full pointer state. This preserves the frame number for PTR_TO_STACK registers and keeps parent identity fields consistent.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74720"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:46Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve pointer state for commuted arithmetic\n\nWhen scalar += pointer is handled in adjust_ptr_min_max_vals(), the\ndestination register inherits the pointer state from the source pointer.\nCopying only selected fields is fragile because pointer provenance is\ntracked by several bpf_reg_state fields.\n\nUse the caller\u0027s temporary offset register to preserve the scalar operand\nwhile replacing the destination with the full pointer state. This preserves\nthe frame number for PTR_TO_STACK registers and keeps parent identity\nfields consistent.",
  "id": "GHSA-6hg3-qqfj-f5ww",
  "modified": "2026-08-25T06:31:30Z",
  "published": "2026-08-22T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74720"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29c239f8dbec5ab33a61796724d189bddee6cd4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8109c25e0c41f5f19a1c2380bb49c991a877494e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86b203aadc2930e0a4f9c6277b5b80ff3664c472"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cb23101a3fcc7432b451ea3d0f14a90711f4acf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4c6f804b44c5c790269b25e0e61cf4e9f117c86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1959028190a7649b926f5867a58de5fe221b23c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db6382ed3361bdd8129572a3423956cba1dae829"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eaffa1495e4fe6330aeff9f323ea3d48b01f118a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74720 (GCVE-0-2026-74720)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:42

Title

bpf: Preserve pointer state for commuted arithmetic

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve pointer state for commuted arithmetic When scalar += pointer is handled in adjust_ptr_min_max_vals(), the destination register inherits the pointer state from the source pointer. Copying only selected fields is fragile because pointer provenance is tracked by several bpf_reg_state fields. Use the caller's temporary offset register to preserve the scalar operand while replacing the destination with the full pointer state. This preserves the frame number for PTR_TO_STACK registers and keeps parent identity fields consistent.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6667 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/86b203aadc2930e0a…
https://git.kernel.org/stable/c/8109c25e0c41f5f19…
https://git.kernel.org/stable/c/d1959028190a7649b…
https://git.kernel.org/stable/c/8cb23101a3fcc7432…
https://git.kernel.org/stable/c/29c239f8dbec5ab33…
https://git.kernel.org/stable/c/db6382ed3361bdd81…
https://git.kernel.org/stable/c/eaffa1495e4fe6330…
https://git.kernel.org/stable/c/a4c6f804b44c5c790…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < 86b203aadc2930e0a4f9c6277b5b80ff3664c472 (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < 8109c25e0c41f5f19a1c2380bb49c991a877494e (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < d1959028190a7649b926f5867a58de5fe221b23c (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < 8cb23101a3fcc7432b451ea3d0f14a90711f4acf (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < 29c239f8dbec5ab33a61796724d189bddee6cd4b (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < db6382ed3361bdd8129572a3423956cba1dae829 (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < eaffa1495e4fe6330aeff9f323ea3d48b01f118a (git) Affected: f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 , < a4c6f804b44c5c790269b25e0e61cf4e9f117c86 (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86b203aadc2930e0a4f9c6277b5b80ff3664c472",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "8109c25e0c41f5f19a1c2380bb49c991a877494e",
              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
            },
            {
              "lessThan": "8cb23101a3fcc7432b451ea3d0f14a90711f4acf",
              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
            },
            {
              "lessThan": "29c239f8dbec5ab33a61796724d189bddee6cd4b",
              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
            },
            {
              "lessThan": "db6382ed3361bdd8129572a3423956cba1dae829",
              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
              "versionType": "git"
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          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve pointer state for commuted arithmetic\n\nWhen scalar += pointer is handled in adjust_ptr_min_max_vals(), the\ndestination register inherits the pointer state from the source pointer.\nCopying only selected fields is fragile because pointer provenance is\ntracked by several bpf_reg_state fields.\n\nUse the caller\u0027s temporary offset register to preserve the scalar operand\nwhile replacing the destination with the full pointer state. This preserves\nthe frame number for PTR_TO_STACK registers and keeps parent identity\nfields consistent."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The flaw is in bpf_check()/adjust_ptr_min_max_vals() during bpf(BPF_PROG_LOAD) via the local bpf(2) syscall; per kernel CNA guidance BPF verifier bugs are Local, not reachable from remote network packet handling.\nAC:L - An attacker fully controls BPF bytecode using commuted 64-bit scalar+=pointer ALU and bpf2bpf call chains, deterministically poisoning register state during verification without races or external preconditions.\nPR:L - Exploitation requires loading bpf2bpf programs (CAP_BPF-gated), which is routinely available to unprivileged users via user namespaces/BPF token delegation or unprivileged socket-filter loading when kernel.unprivileged_bpf_disabled=0, not init-namespace root.\nUI:N - The attacker loads and executes their own crafted BPF program through bpf(2); no separate victim action such as mounting filesystems or opening files is required beyond the attacker\u0027s own local access.\nS:U - Impact is a BPF verifier bypass enabling in-kernel out-of-bounds memory access and privilege escalation within the host kernel\u0027s security authority; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - Copying only type/id on scalar+=pointer leaves stale frameno, var_off, and map/parent metadata, so bpf_func() stack checks validate the wrong frame and approve out-of-bounds reads of adjacent kernel memory.\nI:H - The same incorrect pointer provenance permits verifier-approved out-of-bounds BPF stack/map writes at runtime, a controllable kernel memory corruption primitive leverageable for arbitrary modification and privilege escalation.\nA:H - Out-of-bounds BPF memory accesses from the bypassed verifier state can corrupt critical kernel data or dereference invalid addresses, reliably causing kernel oops/panic and repeatable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:42:01.009Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/eaffa1495e4fe6330aeff9f323ea3d48b01f118a"
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          "url": "https://git.kernel.org/stable/c/a4c6f804b44c5c790269b25e0e61cf4e9f117c86"
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      "title": "bpf: Preserve pointer state for commuted arithmetic",
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    "datePublished": "2026-08-22T15:33:13.342Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-25T05:42:01.009Z",
    "state": "PUBLISHED"
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  "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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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