Vulnerability-Lookup

GHSA-XHQX-5F69-QRG5

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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.

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-2026-64053"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:45Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-xhqx-5f69-qrg5",
  "modified": "2026-07-20T15:31:57Z",
  "published": "2026-07-19T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4"
    }
  ],
  "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-2026-64053 (GCVE-0-2026-64053)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42

Title

block: don't overwrite bip_vcnt in bio_integrity_copy_user()

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.

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

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)

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{
  "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",
          "versions": [
            {
              "lessThan": "d18160c9525c63c203656fefd847e94b538cd4a4",
              "status": "affected",
              "version": "3991657ae7074c3c497bf095093178bed37ea1b4",
              "versionType": "git"
            },
            {
              "lessThan": "0d48654af4d1390c888389206cc13b51b82c30e6",
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              "versionType": "git"
            },
            {
              "lessThan": "637ad3a56a3b889527d1dacea6fea2a8bd648140",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
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            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.92",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
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            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:42:51.761Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"
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      ],
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    "cveId": "CVE-2026-64053",
    "datePublished": "2026-07-19T15:39:35.854Z",
    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-07-20T13:42:51.761Z",
    "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-XHQX-5F69-QRG5

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

Tags

Sightings

Nomenclature