{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80720", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.788Z", "datePublished": "2026-08-28T06:53:16.683Z", "dateUpdated": "2026-08-29T06:22:35.780Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:35.780Z"}, "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 <brauner@kernel.org> 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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - On ZNS-backed XFS realtime volumes exported via nfsd/ksmbd, remote client write I/O reaches vfs_write()->xfs_zone_alloc_and_submit()->iomap_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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/iomap/ioend.c"], "versions": [{"version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80", "lessThan": "cfc686a1174aa904dcad9b9a7c5e46b484d27e4e", "status": "affected", "versionType": "git"}, {"version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80", "lessThan": "4a869be56e9f6ce7462abcf324ebdefc5de051be", "status": "affected", "versionType": "git"}, {"version": "5fcbd555d48390a8c819ba7fdf55fbfcabe05c80", "lessThan": "c679ce3be6cb63763d68ab9b5d9d73ddc0a40762", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/iomap/ioend.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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 <brauner@kernel.org> 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": "CVE-2026-80720", "lastModified": "2026-08-28T08:16:57.810", "metrics": {}, "published": "2026-08-28T08:16:57.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a869be56e9f6ce7462abcf324ebdefc5de051be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c679ce3be6cb63763d68ab9b5d9d73ddc0a40762"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cfc686a1174aa904dcad9b9a7c5e46b484d27e4e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}