Vulnerability-Lookup

FKIE_CVE-2026-64053

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-09-02 21:09

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: block: don't overwrite bip_vcnt in bio_integrity_copy_user() bio_integrity_add_page() already sets bip_vcnt to 1 for the bounce segment. Overwriting it with nr_vecs breaks bip_vcnt <= bip_max_vcnt on WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h read past the bip_vec[] flex array. On READ the read is in bounds but lands on a saved user bvec instead of the bounce. The line was added for split propagation, but bio_integrity_clone() doesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/bio-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          ]
        },
        {
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          ],
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            },
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            },
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
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              "versionEndExcluding": "6.12.92",
              "versionStartIncluding": "6.11",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don\u0027t overwrite bip_vcnt in bio_integrity_copy_user()\n\nbio_integrity_add_page() already sets bip_vcnt to 1 for the bounce\nsegment. Overwriting it with nr_vecs breaks bip_vcnt \u003c= bip_max_vcnt\non WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h\nread past the bip_vec[] flex array. On READ the read is in bounds\nbut lands on a saved user bvec instead of the bounce.\n\nThe line was added for split propagation, but bio_integrity_clone()\ndoesn\u0027t copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER."
    }
  ],
  "id": "CVE-2026-64053",
  "lastModified": "2026-09-02T21:09:42.357",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:45.730",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7"
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64053 (GCVE-0-2026-64053)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38

Title

block: don't overwrite bip_vcnt in bio_integrity_copy_user()

Summary

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 mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d18160c9525c63c20…
https://git.kernel.org/stable/c/0d48654af4d1390c8…
https://git.kernel.org/stable/c/066be1439593a381b…
https://git.kernel.org/stable/c/637ad3a56a3b88952…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3991657ae7074c3c497bf095093178bed37ea1b4 , < d18160c9525c63c203656fefd847e94b538cd4a4 (git) Affected: 3991657ae7074c3c497bf095093178bed37ea1b4 , < 0d48654af4d1390c888389206cc13b51b82c30e6 (git) Affected: 3991657ae7074c3c497bf095093178bed37ea1b4 , < 066be1439593a381b1a29663becfcfe0c92363e7 (git) Affected: 3991657ae7074c3c497bf095093178bed37ea1b4 , < 637ad3a56a3b889527d1dacea6fea2a8bd648140 (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/bio-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.11"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
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              "versionType": "semver"
            },
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              "versionType": "semver"
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          },
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              "value": "AV:L - The bug is only reachable via local syscalls on an integrity-capable block device\u2014io_uring read/write with PI attributes (`IOCB_HAS_METADATA` \u2192 `bio_integrity_map_iter()`) or NVMe ioctls (`NVME_IOCTL_SUBMIT_IO`/`NVME_IOCTL_IO_CMD` \u2192 `blk_rq_integrity_map_user()`). No network-facing server path (ksmbd, nfsd, nvmet) calls `bio_integrity_copy_user()`.\nAC:L - An attacker fully controls the conditions needed to hit the copy path and trigger the bad index: misaligned or multi-segment integrity user buffers force `copy=true`, multi-page scatter yields `nr_bvecs\u003e1`, and concurrent O_DIRECT integrity writes to the same queue trigger `integrity_req_gap_*_merge()` that dereferences the corrupted `bip_vcnt`.\nPR:L - No kernel capabilities or init-namespace root are required beyond permission to open and perform O_DIRECT I/O on an integrity-enabled block device (`/dev/nvme*`, SCSI DIF disk); io_uring and NVMe ioctls are available to any local user granted device access (e.g., disk group, container volume mounts on storage nodes).\nUI:N - Exploitation is self-initiated by the attacker issuing crafted integrity I/O; no victim interaction such as mounting a filesystem or opening a file is required.\nS:U - Impact is confined to kernel memory safety within the block-integrity path on the host; it does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - On WRITE, `bip_vcnt` is incorrectly set to `nr_vecs` while `bip_max_vcnt` is 1, so `integrity_req_gap_back_merge()`/`integrity_req_gap_front_merge()` in `block/blk.h` index `bip_vec[bip_vcnt-1]` past the single-slot kmalloc flex array, causing an out-of-bounds read of adjacent kernel heap memory that can disclose kernel pointers and other sensitive data.\nI:H - The corrupted `bip_vcnt` breaks integrity metadata bookkeeping during bio/request merging; on READ it causes gap-merge logic to consult saved user bvecs instead of the kernel bounce buffer, and the heap OOB read corrupts kernel memory-safety invariants in ways that can be chained toward further memory corruption or control-flow manipulation.\nA:H - With large `nr_bvecs` (up to `BIO_MAX_VECS`), the out-of-bounds `bip_vec` access can extend far beyond the kmalloc object boundary and provoke a kernel oops/page fault during merge processing; even without full exploitation, the integrity path malfunction can destabilize the I/O stack."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:43.588Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
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        }
      ],
      "title": "block: don\u0027t overwrite bip_vcnt in bio_integrity_copy_user()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64053",
    "datePublished": "2026-07-19T15:39:35.854Z",
    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-08-05T12:38:43.588Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2026-64053

CVE-2026-64053 (GCVE-0-2026-64053)

Tags

Sightings

Nomenclature

Related by attack behaviour