{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63818", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.014Z", "datePublished": "2026-07-19T12:02:17.022Z", "dateUpdated": "2026-07-24T14:34:11.320Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-24T14:34:11.320Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate orphan inode entry count\n\nf2fs_recover_orphan_inodes() trusts the orphan block entry_count when\nreplaying orphan inodes from the checkpoint pack. A corrupted entry_count\nlarger than F2FS_ORPHANS_PER_BLOCK makes the recovery loop read past the\nino[] array and interpret footer or following data as inode numbers.\n\nOn a crafted image, mounting an unpatched kernel can drive orphan recovery\ninto f2fs_bug_on() and panic the kernel. Validate entry_count before\nconsuming entries so corrupted checkpoint data fails the mount with\n-EFSCORRUPTED and requests fsck instead.\n\nSet ERROR_INCONSISTENT_ORPHAN as well, so the corruption reason can be\nrecorded in the superblock s_errors[] field. This gives fsck a persistent\nhint even though mount-time orphan recovery failure may leave no chance to\npersist SBI_NEED_FSCK through a checkpoint."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/checkpoint.c", "include/linux/f2fs_fs.h"], "versions": [{"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "210c210c92d78fdf5051bc55c5c69044b1a2150a", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "ad101d15716f5a24d1fa82a849f80430c805a3dd", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "d2f236196d542ccd8505736e41c3a1d3f0305f6f", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "550511a2470f6d204fa07b331f048bd2d3c51280", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "8aad54746c251f2c2370118df766c0c82e2d2091", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "2e12381d4495dc8b0ff042c6856022b2e359835c", "status": "affected", "versionType": "git"}, {"version": "127e670abfa7fa150f6550d620ded930f5bdb4e7", "lessThan": "846c499a65816d13f1186e3090e825e8bb8bcb8b", "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/checkpoint.c", "include/linux/f2fs_fs.h"], "versions": [{"version": "3.8", "status": "affected"}, {"version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "3.8", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.18.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.1.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/210c210c92d78fdf5051bc55c5c69044b1a2150a"}, {"url": "https://git.kernel.org/stable/c/ad101d15716f5a24d1fa82a849f80430c805a3dd"}, {"url": "https://git.kernel.org/stable/c/d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70"}, {"url": "https://git.kernel.org/stable/c/d2f236196d542ccd8505736e41c3a1d3f0305f6f"}, {"url": "https://git.kernel.org/stable/c/550511a2470f6d204fa07b331f048bd2d3c51280"}, {"url": "https://git.kernel.org/stable/c/8aad54746c251f2c2370118df766c0c82e2d2091"}, {"url": "https://git.kernel.org/stable/c/2e12381d4495dc8b0ff042c6856022b2e359835c"}, {"url": "https://git.kernel.org/stable/c/846c499a65816d13f1186e3090e825e8bb8bcb8b"}], "title": "f2fs: validate orphan inode entry count", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: f2fs: validate orphan inode entry count", "id": "2502229", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502229"}, "csaw": false, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: validate orphan inode entry count\nf2fs_recover_orphan_inodes() trusts the orphan block entry_count when\nreplaying orphan inodes from the checkpoint pack. A corrupted entry_count\nlarger than F2FS_ORPHANS_PER_BLOCK makes the recovery loop read past the\nino[] array and interpret footer or following data as inode numbers.\nOn a crafted image, mounting an unpatched kernel can drive orphan recovery\ninto f2fs_bug_on() and panic the kernel. Validate entry_count before\nconsuming entries so corrupted checkpoint data fails the mount with\n-EFSCORRUPTED and requests fsck instead.\nSet ERROR_INCONSISTENT_ORPHAN as well, so the corruption reason can be\nrecorded in the superblock s_errors[] field. This gives fsck a persistent\nhint even though mount-time orphan recovery failure may leave no chance to\npersist SBI_NEED_FSCK through a checkpoint.", "A flaw was found in the Linux kernel's F2FS (Flash-Friendly File System) component. This vulnerability arises from improper validation of the orphan inode entry count during the recovery process. A local attacker could craft a malicious F2FS image, which, when mounted on an unpatched system, could lead to a kernel panic, resulting in a Denial of Service (DoS). The system would become unresponsive, requiring a restart."], "name": "CVE-2026-63818", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63818\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63818\nhttps://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63818-f404@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[127e670abfa7fa150f6550d620ded930f5bdb4e7,550511a2470f6d204fa07b331f048bd2d3c51280)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[127e670abfa7fa150f6550d620ded930f5bdb4e7,8aad54746c251f2c2370118df766c0c82e2d2091)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[127e670abfa7fa150f6550d620ded930f5bdb4e7,2e12381d4495dc8b0ff042c6856022b2e359835c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[127e670abfa7fa150f6550d620ded930f5bdb4e7,846c499a65816d13f1186e3090e825e8bb8bcb8b)"}}], "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": "calver", "value": "3.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.96,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.38,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.3,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-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": "2026-07-21T02:00:17.173069+00:00", "updated": "2026-07-22T00:15:03.058863+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}