GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-89578 (GCVE-0-2026-89578)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-11 19:44
VLAI
Title
dm-io: clone the source bio instead of copying its biovec
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-io: clone the source bio instead of copying its biovec For DM_IO_BIO requests, do_region() built each destination bio by walking the source bio's biovec and re-adding the pages one at a time, tracking the remaining transfer in sectors. The vector lengths are byte granular and need not be sector aligned (e.g. a misaligned O_DIRECT buffer split across pages), so the sector-based accounting could lose a sub-sector fragment: to_sector() truncated the remainder and the outer loop spun forever submitting empty bios, hanging the I/O. There is no need to rebuild the biovec at all. The destination reads into (or writes from) exactly the same pages as the source bio, so the bio can simply clone the source's biovec with bio_alloc_clone() and remap it to the target device. The clone inherits the source's iterator and alignment, and the block layer splits it to the target's limits on submission, so the whole region maps to a single cloned bio with no manual page copying or sector accounting. This removes the per-page copy path (and its open-coded bvec dpages helpers) for bio-backed I/O and fixes the hang on misaligned direct I/O to a dm-mirror device. Page-list, vma and kmem sources keep the existing copy path.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ff3f74e145adc79b49668adb8de276446acf6be , < 9493ac67623d45b7d4671d2b0b4d0633c2bc2e51 (git)
Affected: 5ff3f74e145adc79b49668adb8de276446acf6be , < 8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c (git)
Affected: 5ff3f74e145adc79b49668adb8de276446acf6be , < 62dc37a819a5a5de5cba989ad9e96ee214b9253e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9493ac67623d45b7d4671d2b0b4d0633c2bc2e51",
              "status": "affected",
              "version": "5ff3f74e145adc79b49668adb8de276446acf6be",
              "versionType": "git"
            },
            {
              "lessThan": "8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c",
              "status": "affected",
              "version": "5ff3f74e145adc79b49668adb8de276446acf6be",
              "versionType": "git"
            },
            {
              "lessThan": "62dc37a819a5a5de5cba989ad9e96ee214b9253e",
              "status": "affected",
              "version": "5ff3f74e145adc79b49668adb8de276446acf6be",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-io: clone the source bio instead of copying its biovec\n\nFor DM_IO_BIO requests, do_region() built each destination bio by walking\nthe source bio\u0027s biovec and re-adding the pages one at a time, tracking\nthe remaining transfer in sectors. The vector lengths are byte granular\nand need not be sector aligned (e.g. a misaligned O_DIRECT buffer split\nacross pages), so the sector-based accounting could lose a sub-sector\nfragment: to_sector() truncated the remainder and the outer loop spun\nforever submitting empty bios, hanging the I/O.\n\nThere is no need to rebuild the biovec at all. The destination reads into\n(or writes from) exactly the same pages as the source bio, so the bio can\nsimply clone the source\u0027s biovec with bio_alloc_clone() and remap it to\nthe target device. The clone inherits the source\u0027s iterator and alignment,\nand the block layer splits it to the target\u0027s limits on submission, so the\nwhole region maps to a single cloned bio with no manual page copying or\nsector accounting.\n\nThis removes the per-page copy path (and its open-coded bvec dpages\nhelpers) for bio-backed I/O and fixes the hang on misaligned direct I/O to\na dm-mirror device. Page-list, vma and kmem sources keep the existing copy\npath."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:44:45.364Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9493ac67623d45b7d4671d2b0b4d0633c2bc2e51"
        },
        {
          "url": "https://git.kernel.org/stable/c/8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/62dc37a819a5a5de5cba989ad9e96ee214b9253e"
        }
      ],
      "title": "dm-io: clone the source bio instead of copying its biovec",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89578",
    "datePublished": "2026-09-11T19:44:45.364Z",
    "dateReserved": "2026-09-11T19:38:34.728Z",
    "dateUpdated": "2026-09-11T19:44:45.364Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89578",
      "date": "2026-09-17",
      "epss": "0.00198",
      "percentile": "0.09813"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89578\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:42.000\",\"lastModified\":\"2026-09-11T20:19:42.000\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm-io: clone the source bio instead of copying its biovec\\n\\nFor DM_IO_BIO requests, do_region() built each destination bio by walking\\nthe source bio\u0027s biovec and re-adding the pages one at a time, tracking\\nthe remaining transfer in sectors. The vector lengths are byte granular\\nand need not be sector aligned (e.g. a misaligned O_DIRECT buffer split\\nacross pages), so the sector-based accounting could lose a sub-sector\\nfragment: to_sector() truncated the remainder and the outer loop spun\\nforever submitting empty bios, hanging the I/O.\\n\\nThere is no need to rebuild the biovec at all. The destination reads into\\n(or writes from) exactly the same pages as the source bio, so the bio can\\nsimply clone the source\u0027s biovec with bio_alloc_clone() and remap it to\\nthe target device. The clone inherits the source\u0027s iterator and alignment,\\nand the block layer splits it to the target\u0027s limits on submission, so the\\nwhole region maps to a single cloned bio with no manual page copying or\\nsector accounting.\\n\\nThis removes the per-page copy path (and its open-coded bvec dpages\\nhelpers) for bio-backed I/O and fixes the hang on misaligned direct I/O to\\na dm-mirror device. Page-list, vma and kmem sources keep the existing copy\\npath.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-io.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5ff3f74e145adc79b49668adb8de276446acf6be\",\"lessThan\":\"9493ac67623d45b7d4671d2b0b4d0633c2bc2e51\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3f74e145adc79b49668adb8de276446acf6be\",\"lessThan\":\"8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3f74e145adc79b49668adb8de276446acf6be\",\"lessThan\":\"62dc37a819a5a5de5cba989ad9e96ee214b9253e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-io.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/62dc37a819a5a5de5cba989ad9e96ee214b9253e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9493ac67623d45b7d4671d2b0b4d0633c2bc2e51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T04:54:24+00:00",
      "cve": "CVE-2026-89578",
      "id": "CVE-2026-89578",
      "initial_release_date": "2026-09-11T19:44:45.364000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux Kernel: dm-io vulnerability leads to denial of service via I/O hang",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T00:58:15Z",
      "cve": "CVE-2026-89578",
      "id": "CVE-2026-89578",
      "initial_release_date": "2026-09-15T00:58:15Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89578",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89578.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.