{"api_version":"1","generated_at":"2026-08-29T12:11:54+00:00","cve":"CVE-2026-80720","urls":{"html":"https://cve.report/CVE-2026-80720","api":"https://cve.report/api/cve/CVE-2026-80720.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80720","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80720"},"summary":{"title":"iomap: add a separate bio_set for iomap_split_ioend","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:57","updated_at":"2026-08-29 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80720","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 cfc686a1174aa904dcad9b9a7c5e46b484d27e4e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 4a869be56e9f6ce7462abcf324ebdefc5de051be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5fcbd555d48390a8c819ba7fdf55fbfcabe05c80 c679ce3be6cb63763d68ab9b5d9d73ddc0a40762 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80720","cve":"CVE-2026-80720","epss":"0.001540000","percentile":"0.048970000","score_date":"2026-08-28","updated_at":"2026-08-29 00:12:17"},"legacy_qids":[]},"source_records":{"cve_program":{"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 <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":{"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()->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."}]}],"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"},"nvd":{"publishedDate":"2026-08-28 08:16:57","lastModifiedDate":"2026-08-29 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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.","Type":"Description","Title":"iomap: add a separate bio_set for iomap_split_ioend"}]}}}