CVE-2026-89838

{"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": "2026-10-30T12:33:16.337Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:33:16.337Z"}, "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": "b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28", "status": "affected", "versionType": "git"}, {"version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "450ab2e5dbe0ef6e3ed73214256565f6f003d62a", "status": "affected", "versionType": "git"}, {"version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "lessThan": "3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25", "status": "affected", "versionType": "git"}, {"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": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "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": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.191"}, {"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/b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28"}, {"url": "https://git.kernel.org/stable/c/450ab2e5dbe0ef6e3ed73214256565f6f003d62a"}, {"url": "https://git.kernel.org/stable/c/3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/f2fs/recovery.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "450ab2e5dbe0ef6e3ed73214256565f6f003d62a", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "e754120f8ede55cc773ade108cf7e5b17c859c46", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "7ab1780074943508534343e1e5e5ab0c9ef9dd7b", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "35c5abccd0924b02ad34126f562d93c8d75b0831", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "317d32e1a8deaf1c01c388badc667334c39e62ca", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}, {"lessThan": "01027b2fcb74dade59fb833b51023f6593b6a9a2", "status": "affected", "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/f2fs/recovery.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.11"}, {"lessThan": "3.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\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."}], "id": "CVE-2026-89838", "lastModified": "2026-10-30T13:20:31.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:50.620", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/01027b2fcb74dade59fb833b51023f6593b6a9a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/317d32e1a8deaf1c01c388badc667334c39e62ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35c5abccd0924b02ad34126f562d93c8d75b0831"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/450ab2e5dbe0ef6e3ed73214256565f6f003d62a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ab1780074943508534343e1e5e5ab0c9ef9dd7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e754120f8ede55cc773ade108cf7e5b17c859c46"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f356fe0cba0e3523e538987916bd2acedd4e6f41,317d32e1a8deaf1c01c388badc667334c39e62ca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f356fe0cba0e3523e538987916bd2acedd4e6f41,01027b2fcb74dade59fb833b51023f6593b6a9a2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.5,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-16T18:30:07.618868+00:00", "updated": "2026-09-18T09:00:08.638719+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119", "CWE-200"]}