{"api_version":"1","generated_at":"2026-08-29T12:12:04+00:00","cve":"CVE-2026-80591","urls":{"html":"https://cve.report/CVE-2026-80591","api":"https://cve.report/api/cve/CVE-2026-80591.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80591","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80591"},"summary":{"title":"f2fs: fix listxattr handling of corrupted xattr entries","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix listxattr handling of corrupted xattr entries\n\nValidate the xattr entry before reading its fields in f2fs_listxattr().\nReturn -EFSCORRUPTED when the entry is outside the valid xattr storage\narea instead of returning a successful partial result.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:42","updated_at":"2026-08-29 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the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix listxattr handling of corrupted xattr entries\n\nValidate the xattr entry before reading its fields in f2fs_listxattr().\nReturn -EFSCORRUPTED when the entry is outside the valid xattr storage\narea instead of returning a successful partial result."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached via local listxattr/flistxattr/listxattrat syscalls through vfs_listxattr into f2fs_listxattr; f2fs is a local block filesystem (Android userdata, embedded flash) and although nfsd/ksmbd can call vfs_listxattr this is a secondary path requiring pre-existing on-disk corruption.\nAC:L - Once a crafted f2fs image with corrupted xattr entry sizes is mounted, the attacker deterministically controls the on-disk layout that makes list_for_each_xattr iterate past last_base_addr; no race, special memory layout, or rare kernel config is required beyond standard CONFIG_F2FS_FS_XATTR.\nPR:L - Planting malformed on-disk xattr metadata requires offline image crafting plus CAP_SYS_ADMIN to loop-mount (obtainable in an unprivileged user namespace) or root for raw block writes; triggering listxattr only needs normal file access on the attacker-controlled mount with no capability checks beyond LSM hooks on the syscall path.\nUI:N - In the highest-impact self-contained attack the attacker crafts a malicious f2fs image and mounts it inside their own user namespace, then calls listxattr on their own inode with no victim action such as opening a file or inserting removable media required.\nS:U - The out-of-bounds read corrupts or leaks kernel heap memory within the same kernel security domain; this is a standard local kernel memory-safety flaw, not a VM escape, container breakout, or IOMMU boundary bypass.\nC:H - Before bounds validation f2fs_listxattr reads entry->e_name_index and XATTR_NEXT_ENTRY() fields from xattr entries outside the valid storage area, causing slab out-of-bounds reads of adjacent kernel heap objects that can disclose kernel pointers and sensitive kernel data.\nI:H - Although the immediate fault is a read past bounds rather than a write, this is kernel heap memory corruption class behavior; adjacent-slab reads are routinely chained into further kernel exploitation via heap grooming for arbitrary write and code execution, so I:H applies when uncertain.\nA:H - Reading xattr entry fields beyond the kmalloc-allocated buffer can fault the kernel with a slab out-of-bounds access or oops under KASAN/hardening; f2fs_handle_error may log corruption but does not prevent the out-of-bounds read from destabilizing the system on each listxattr 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07:16:44","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80591","Ordinal":"1","Title":"f2fs: fix listxattr handling of corrupted xattr entries","CVE":"CVE-2026-80591","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80591","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix listxattr handling of corrupted xattr entries\n\nValidate the xattr entry before reading its fields in f2fs_listxattr().\nReturn -EFSCORRUPTED when the entry is outside the valid xattr storage\narea instead of returning a successful partial result.","Type":"Description","Title":"f2fs: fix listxattr handling of corrupted xattr entries"}]}}}