Vulnerability-Lookup

GHSA-CV4X-7435-V3R7

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32

Details

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

dm-integrity: don't increment hash_offset twice

hash_offset is already incremented in the loop "for (i = 0; i < to_copy; i++, ts--)". Do not increment it again.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72099"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:24Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: don\u0027t increment hash_offset twice\n\nhash_offset is already incremented in the loop \"for (i = 0; i \u003c to_copy;\ni++, ts--)\". Do not increment it again.",
  "id": "GHSA-cv4x-7435-v3r7",
  "modified": "2026-08-23T15:32:59Z",
  "published": "2026-08-15T06:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72099"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39697e2759ac23e65361fe61482f8174cad8a752"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f4e43337e9ef322595201cfc24def50fd624219"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5dfd8042635278613da3b88553e25ade2103cd58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/829476c06496aab018f14127c055adb164d1a750"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c66b1781a54984227e94b862be9328d81d81e51c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf9feed8c131e303ecf2afebe6f791be018818ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6646f4d711d74930d39cce6fb7bfcae4cbee5fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/edf025f083854f80032b73a1aad69a3c90db236f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72099 (GCVE-0-2026-72099)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46

Title

dm-integrity: don't increment hash_offset twice

Summary

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: don't increment hash_offset twice hash_offset is already incremented in the loop "for (i = 0; i < to_copy; i++, ts--)". Do not increment it again.

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c66b1781a54984227…
https://git.kernel.org/stable/c/39697e2759ac23e65…
https://git.kernel.org/stable/c/e6646f4d711d74930…
https://git.kernel.org/stable/c/cf9feed8c131e303e…
https://git.kernel.org/stable/c/4f4e43337e9ef3225…
https://git.kernel.org/stable/c/5dfd8042635278613…
https://git.kernel.org/stable/c/829476c06496aab01…
https://git.kernel.org/stable/c/edf025f083854f800…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < c66b1781a54984227e94b862be9328d81d81e51c (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 39697e2759ac23e65361fe61482f8174cad8a752 (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < e6646f4d711d74930d39cce6fb7bfcae4cbee5fd (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < cf9feed8c131e303ecf2afebe6f791be018818ad (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 4f4e43337e9ef322595201cfc24def50fd624219 (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 5dfd8042635278613da3b88553e25ade2103cd58 (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 829476c06496aab018f14127c055adb164d1a750 (git) Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < edf025f083854f80032b73a1aad69a3c90db236f (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "version": "0",
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              "status": "unaffected",
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              "lessThanOrEqual": "*",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: don\u0027t increment hash_offset twice\n\nhash_offset is already incremented in the loop \"for (i = 0; i \u003c to_copy;\ni++, ts--)\". Do not increment it again."
        }
      ],
      "metrics": [
        {
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            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
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              "lang": "en",
              "value": "AV:N - The flaw is reached via block I/O on dm-integrity journal/bitmap targets; in enterprise/cloud deployments those volumes are commonly accessed remotely through NFS/ksmbd file exports or iSCSI/NVMe-oF/NBD block protocols, letting a remote client drive the vulnerable TAG_CMP path.\nAC:L - An attacker with read access can reliably trigger TAG_CMP by issuing ordinary multi-sector reads; when metadata tag comparisons span dm-bufio buffer boundaries the double-incremented hash_offset mispredicts tag boundaries without races or uncontrollable layout.\nPR:L - Table creation needs CAP_SYS_ADMIN (obtainable in a user namespace), but exploitation only requires read/write access to the mapped block device or an exported filesystem backed by it, not init-namespace root.\nUI:N - Exploitation requires only attacker-initiated reads or writes against the dm-integrity-backed storage; no additional victim actions such as mounting a filesystem or opening files beyond the attacker\u0027s own I/O are needed.\nS:U - Impact is incorrect integrity-tag verification within the host kernel\u0027s device-mapper layer, enabling undetected data tampering or spurious verification failures on the same host; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The bug corrupts tag-boundary state during comparison but does not cause kernel memory disclosure, out-of-bounds reads, or use-after-free; any wrong data returned is attacker-supplied disk content, not leakage of unrelated kernel or user secrets.\nI:H - Misaligned hash_offset can accept integrity tags that should fail verification (including mixed hash/discard-filler boundaries), defeating dm-integrity\u0027s tamper detection and allowing undetected modification of protected block data.\nA:L - The same logic error can spuriously fail checksum verification on legitimate reads, returning I/O errors and denying access to protected data without kernel panic, though repeated reads can sustain a denial-of-service against the volume."
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        "dateUpdated": "2026-08-23T12:46:49.483Z",
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        {
          "url": "https://git.kernel.org/stable/c/edf025f083854f80032b73a1aad69a3c90db236f"
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      "title": "dm-integrity: don\u0027t increment hash_offset twice",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72099",
    "datePublished": "2026-08-15T05:52:44.292Z",
    "dateReserved": "2026-08-09T03:40:39.905Z",
    "dateUpdated": "2026-08-23T12:46:49.483Z",
    "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.

Detection rules are retrieved from Rulezet.

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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GHSA-CV4X-7435-V3R7

CVE-2026-72099 (GCVE-0-2026-72099)

Tags

Sightings

Nomenclature