Vulnerability-Lookup

GHSA-88FC-RW34-HX7H

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30

Details

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

iomap: add a separate bio_set for iomap_split_ioend

iomap_split_ioend can split bios that already come from iomap_ioend_bioset and thus deadlock when the bioset is exhausted.

Add a separate bio_set to avoid this deadlock.

Christian Brauner brauner@kernel.org says: Mark iomap_ioend_split_bioset static as it is only used in ioend.c, fixing the sparse warning reported by the kernel test robot.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80720"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:57Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: add a separate bio_set for iomap_split_ioend\n\niomap_split_ioend can split bios that already come from\niomap_ioend_bioset and thus deadlock when the bioset is exhausted.\n\nAdd a separate bio_set to avoid this deadlock.\n\nChristian Brauner \u003cbrauner@kernel.org\u003e says:\nMark iomap_ioend_split_bioset static as it is only used in ioend.c,\nfixing the sparse warning reported by the kernel test robot.",
  "id": "GHSA-88fc-rw34-hx7h",
  "modified": "2026-08-29T09:30:29Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80720"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a869be56e9f6ce7462abcf324ebdefc5de051be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c679ce3be6cb63763d68ab9b5d9d73ddc0a40762"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfc686a1174aa904dcad9b9a7c5e46b484d27e4e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-80720 (GCVE-0-2026-80720)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22

Title

iomap: add a separate bio_set for iomap_split_ioend

Summary

In the Linux kernel, the following vulnerability has been resolved: iomap: add a separate bio_set for iomap_split_ioend iomap_split_ioend can split bios that already come from iomap_ioend_bioset and thus deadlock when the bioset is exhausted. Add a separate bio_set to avoid this deadlock. Christian Brauner <brauner@kernel.org> says: Mark iomap_ioend_split_bioset static as it is only used in ioend.c, fixing the sparse warning reported by the kernel test robot.

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/cfc686a1174aa904d…
https://git.kernel.org/stable/c/4a869be56e9f6ce74…
https://git.kernel.org/stable/c/c679ce3be6cb63763…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 , < cfc686a1174aa904dcad9b9a7c5e46b484d27e4e (git) Affected: 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 , < 4a869be56e9f6ce7462abcf324ebdefc5de051be (git) Affected: 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 , < c679ce3be6cb63763d68ab9b5d9d73ddc0a40762 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/iomap/ioend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cfc686a1174aa904dcad9b9a7c5e46b484d27e4e",
              "status": "affected",
              "version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80",
              "versionType": "git"
            },
            {
              "lessThan": "4a869be56e9f6ce7462abcf324ebdefc5de051be",
              "status": "affected",
              "version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80",
              "versionType": "git"
            },
            {
              "lessThan": "c679ce3be6cb63763d68ab9b5d9d73ddc0a40762",
              "status": "affected",
              "version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/iomap/ioend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: add a separate bio_set for iomap_split_ioend\n\niomap_split_ioend can split bios that already come from\niomap_ioend_bioset and thus deadlock when the bioset is exhausted.\n\nAdd a separate bio_set to avoid this deadlock.\n\nChristian Brauner \u003cbrauner@kernel.org\u003e says:\nMark iomap_ioend_split_bioset static as it is only used in ioend.c,\nfixing the sparse warning reported by the kernel test robot."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - On ZNS-backed XFS realtime volumes exported via nfsd/ksmbd, remote client write I/O reaches vfs_write()-\u003exfs_zone_alloc_and_submit()-\u003eiomap_split_ioend() in the server kernel without local shell access.\nAC:L - An attacker with write access can deterministically exhaust the 32-entry iomap_ioend_bioset via concurrent large zoned writes or direct I/O needing multiple bio_split allocations from the same pool; they control thread count and I/O size without uncontrollable races.\nPR:N - Triggering requires only permission to write realtime files on an XFS zoned filesystem via local syscall or network NFS/SMB client write; no CAP_SYS_ADMIN, ioctl, or init-namespace root is needed beyond write access to exported storage.\nUI:N - The attacker triggers the deadlock with their own concurrent write or direct-I/O requests; no separate victim must mount media, open a file, or perform any interactive action beyond the attacker\u0027s own I/O.\nS:U - The bioset mempool deadlock freezes zoned XFS I/O within the same host kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:N - This is a mempool self-deadlock with no memory corruption, out-of-bounds access, use-after-free, or information disclosure; bio_split failure returns -ENOMEM rather than leaking kernel data.\nI:N - The bug causes tasks to block indefinitely on mempool allocation but does not corrupt, modify, or overwrite file data or enable arbitrary writes or code execution.\nA:H - When iomap_ioend_bioset is exhausted, bio_split blocks on mempool_alloc() while holders cannot release entries, deadlocking writeback workers and zoned submit paths and hanging all I/O on the affected XFS zoned filesystem."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:35.780Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cfc686a1174aa904dcad9b9a7c5e46b484d27e4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a869be56e9f6ce7462abcf324ebdefc5de051be"
        },
        {
          "url": "https://git.kernel.org/stable/c/c679ce3be6cb63763d68ab9b5d9d73ddc0a40762"
        }
      ],
      "title": "iomap: add a separate bio_set for iomap_split_ioend",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80720",
    "datePublished": "2026-08-28T06:53:16.683Z",
    "dateReserved": "2026-08-26T14:34:25.788Z",
    "dateUpdated": "2026-08-29T06:22:35.780Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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-88FC-RW34-HX7H

CVE-2026-80720 (GCVE-0-2026-80720)

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