{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89838", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.769Z", "datePublished": "2026-09-16T10:31:12.746Z", "dateUpdated": "2026-10-21T12:49:01.146Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:49:01.146Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/recovery.c" ], "versions": [ { "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "e754120f8ede55cc773ade108cf7e5b17c859c46", "status": "affected", "versionType": "git" }, { "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "7ab1780074943508534343e1e5e5ab0c9ef9dd7b", "status": "affected", "versionType": "git" }, { "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "35c5abccd0924b02ad34126f562d93c8d75b0831", "status": "affected", "versionType": "git" }, { "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "317d32e1a8deaf1c01c388badc667334c39e62ca", "status": "affected", "versionType": "git" }, { "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "01027b2fcb74dade59fb833b51023f6593b6a9a2", "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/f2fs/recovery.c" ], "versions": [ { "version": "3.11", "status": "affected" }, { "version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "3.11", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }