CVE-2026-63817

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63817", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.014Z", "datePublished": "2026-07-19T12:02:16.441Z", "dateUpdated": "2026-08-17T04:51:24.577Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:24.577Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate compress cache inode only when enabled\n\nF2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode\nnumber for the compressed page cache inode. That inode only exists when\nthe compress_cache mount option is enabled.\n\nWhen compress_cache is disabled, max_nid is outside the valid inode\nrange. A corrupted directory entry that points to ino == max_nid should\ntherefore be rejected by f2fs_check_nid_range(). However, is_meta_ino()\ncurrently treats F2FS_COMPRESS_INO() as a meta inode unconditionally,\nso f2fs_iget() bypasses do_read_inode() and its nid range check, and\ninstantiates a fake internal inode instead.\n\nGate the compressed cache inode case on COMPRESS_CACHE, matching\nf2fs_init_compress_inode(). With compress_cache disabled, ino ==\nmax_nid now follows the normal inode path and is rejected as an\nout-of-range nid."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached through local VFS operations (open/lookup, get_parent, mount-time recovery, and background GC) on a mounted F2FS filesystem; there is no direct network packet handler, though NFS export is a secondary path still requiring local filesystem access to plant corruption.\nAC:L - An attacker can deterministically craft an F2FS image with a directory entry pointing at ino=max_nid (known at image creation) and reliably trigger f2fs_iget() on mount or lookup without depending on uncontrollable runtime conditions.\nPR:L - Triggering requires mounting or writing to F2FS, which needs CAP_SYS_ADMIN but is obtainable by an unprivileged user via user namespaces; planting a corrupted dentry also requires only low-privilege write access to the filesystem.\nUI:N - Once a crafted or corrupted filesystem is in place, exploitation is driven entirely by attacker-initiated syscalls (mount, lookup, open) or automatic kernel paths (GC, recovery) with no victim interaction required.\nS:U - Impact is confined to kernel memory/filesystem integrity on the host running the affected F2FS code; it does not cross a VM, container, or IOMMU security boundary in the manner of a guest-to-host escape.\nC:H - Bypassing inode validation instantiates a mis-typed, uninitialized inode that subsequent f2fs data and node paths operate on, creating a type-confusion condition that can be leveraged for arbitrary kernel memory read primitives.\nI:H - The fake compress-cache inode is wired with compress address_space operations and skips normal inode teardown, enabling type confusion that can be abused for arbitrary kernel memory writes or control-flow hijacking.\nA:H - Operating on an invalid synthetic inode in GC, recovery, or lookup paths can trigger kernel oops, EFSCORRUPTED error handling, or filesystem panic (errors=panic), causing denial of service or system crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/inode.c"], "versions": [{"version": "6ce19aff0b8cd386860855185c6cd79337fc4d2b", "lessThan": "fcc051d377a9701a452e7663a1a8223c26225df9", "status": "affected", "versionType": "git"}, {"version": "6ce19aff0b8cd386860855185c6cd79337fc4d2b", "lessThan": "29115b8c9172d34e67ab26cc4f6c209b7a236d7a", "status": "affected", "versionType": "git"}, {"version": "6ce19aff0b8cd386860855185c6cd79337fc4d2b", "lessThan": "13e4b59d3a9413f66f116fa6c4828519b960a5ea", "status": "affected", "versionType": "git"}, {"version": "6ce19aff0b8cd386860855185c6cd79337fc4d2b", "lessThan": 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{}

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That inode only exists when\nthe compress_cache mount option is enabled.\n\nWhen compress_cache is disabled, max_nid is outside the valid inode\nrange. A corrupted directory entry that points to ino == max_nid should\ntherefore be rejected by f2fs_check_nid_range(). However, is_meta_ino()\ncurrently treats F2FS_COMPRESS_INO() as a meta inode unconditionally,\nso f2fs_iget() bypasses do_read_inode() and its nid range check, and\ninstantiates a fake internal inode instead.\n\nGate the compressed cache inode case on COMPRESS_CACHE, matching\nf2fs_init_compress_inode(). With compress_cache disabled, ino ==\nmax_nid now follows the normal inode path and is rejected as an\nout-of-range nid."}], "id": "CVE-2026-63817", "lastModified": "2026-11-10T21:14:22.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T12:16:54.757", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fcc051d377a9701a452e7663a1a8223c26225df9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: validate compress cache inode only when enabled", "id": "2502211", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502211"}, "csaw": false, "cwe": "CWE-358", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: validate compress cache inode only when enabled\nF2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode\nnumber for the compressed page cache inode. That inode only exists when\nthe compress_cache mount option is enabled.\nWhen compress_cache is disabled, max_nid is outside the valid inode\nrange. A corrupted directory entry that points to ino == max_nid should\ntherefore be rejected by f2fs_check_nid_range(). However, is_meta_ino()\ncurrently treats F2FS_COMPRESS_INO() as a meta inode unconditionally,\nso f2fs_iget() bypasses do_read_inode() and its nid range check, and\ninstantiates a fake internal inode instead.\nGate the compressed cache inode case on COMPRESS_CACHE, matching\nf2fs_init_compress_inode(). With compress_cache disabled, ino ==\nmax_nid now follows the normal inode path and is rejected as an\nout-of-range nid.", "A flaw was found in the Linux kernel's F2FS file system. When the compress_cache mount option is disabled, a corrupted directory entry could point to an invalid inode number. The system incorrectly processes this as a valid internal inode, bypassing critical validation checks. This vulnerability could lead to unexpected system behavior or potential file system corruption."], "name": "CVE-2026-63817", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63817\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63817\nhttps://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63817-2f5c@gregkh/T"]}

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