{"api_version":"1","generated_at":"2026-10-27T06:52:42+00:00","cve":"CVE-2026-89838","urls":{"html":"https://cve.report/CVE-2026-89838","api":"https://cve.report/api/cve/CVE-2026-89838.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89838","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89838"},"summary":{"title":"f2fs: limit recovery filename logging to stored length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: limit recovery filename logging to stored length\n\nF2FS stores recovery filenames as a length plus a fixed-size i_name\nbuffer.  The buffer is not NUL-terminated, but recover_inode() and\nrecover_dentry() print it with %s.\n\nFor a 255-byte filename, recovery logging can read past i_name into the\nfollowing raw inode fields.\n\nPrint the name with a precision bounded by i_namelen and F2FS_NAME_LEN.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:16:50","updated_at":"2026-10-21 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89838","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f356fe0cba0e3523e538987916bd2acedd4e6f41 e754120f8ede55cc773ade108cf7e5b17c859c46 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f356fe0cba0e3523e538987916bd2acedd4e6f41 7ab1780074943508534343e1e5e5ab0c9ef9dd7b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f356fe0cba0e3523e538987916bd2acedd4e6f41 35c5abccd0924b02ad34126f562d93c8d75b0831 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f356fe0cba0e3523e538987916bd2acedd4e6f41 317d32e1a8deaf1c01c388badc667334c39e62ca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: limit recovery filename logging to stored length\n\nF2FS stores recovery filenames as a length plus a fixed-size i_name\nbuffer.  The buffer is not NUL-terminated, but recover_inode() and\nrecover_dentry() print it with %s.\n\nFor a 255-byte filename, recovery logging can read past i_name into the\nfollowing raw inode fields.\n\nPrint the name with a precision bounded by i_namelen and F2FS_NAME_LEN."}],"metrics":[{"cvssV3_1":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - recover_inode() and recover_dentry() run only during local f2fs roll-forward in f2fs_fill_super() -> f2fs_recover_fsync_data(). This is a local block filesystem (Android userdata/portable storage), not a network protocol path such as ksmbd or nfsd.\nAC:L - A crafted f2fs image with a 255-byte non-NUL i_name and a pending fsync node makes printk %s over-read deterministically on mount. Roll-forward is default-enabled; no race or attacker-uncontrollable layout is required.\nPR:L - f2fs lacks FS_USERNS_MOUNT, but Android vold auto-mounts f2fs portable/adoptable storage and desktop/kiosk udisks2/polkit mounts removable media for an ordinary console user, so init-namespace root is not required.\nUI:N - The attacker supplies the crafted image; vold/udisks auto-mount runs roll-forward recovery without a separate deliberate victim mount or open. Recovery also fires automatically on the next mount after an unclean shutdown.\nS:U - The over-read and any resulting oops stay in the host kernel address space and security authority. This is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - recover_inode()/recover_dentry() pass the 255-byte, non-NUL-terminated i_name to printk %s with no precision, so vsprintf scans past the field and the rest of the 4KB node folio into adjacent kernel memory and copies it into dmesg, an unbounded OOB read.\nI:N - The defect is a read-only printk over-read of i_name; it does not write kernel memory, corrupt adjacent objects, or provide a control-flow hijack primitive.\nA:H - Unbounded %s scanning off the node folio can walk into unmapped pages or trip KASAN/page-poisoning and oops/panic the kernel during mount recovery, fully denying availability."}]}],"providerMetadata":{"dateUpdated":"2026-10-21T12:49:01.146Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e754120f8ede55cc773ade108cf7e5b17c859c46"},{"url":"https://git.kernel.org/stable/c/7ab1780074943508534343e1e5e5ab0c9ef9dd7b"},{"url":"https://git.kernel.org/stable/c/35c5abccd0924b02ad34126f562d93c8d75b0831"},{"url":"https://git.kernel.org/stable/c/317d32e1a8deaf1c01c388badc667334c39e62ca"},{"url":"https://git.kernel.org/stable/c/01027b2fcb74dade59fb833b51023f6593b6a9a2"}],"title":"f2fs: limit recovery filename logging to stored length","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89838","datePublished":"2026-09-16T10:31:12.746Z","dateReserved":"2026-09-11T19:38:34.769Z","dateUpdated":"2026-10-21T12:49:01.146Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:50","lastModifiedDate":"2026-10-21 13:20:30","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:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89838","Ordinal":"1","Title":"f2fs: limit recovery filename logging to stored length","CVE":"CVE-2026-89838","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89838","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: limit recovery filename logging to stored length\n\nF2FS stores recovery filenames as a length plus a fixed-size i_name\nbuffer.  The buffer is not NUL-terminated, but recover_inode() and\nrecover_dentry() print it with %s.\n\nFor a 255-byte filename, recovery logging can read past i_name into the\nfollowing raw inode fields.\n\nPrint the name with a precision bounded by i_namelen and F2FS_NAME_LEN.","Type":"Description","Title":"f2fs: limit recovery filename logging to stored length"}]}}}