{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49363", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.547Z", "datePublished": "2025-02-26T02:11:09.817Z", "dateUpdated": "2026-08-15T12:22:39.847Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:22:39.847Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on block address in f2fs_do_zero_range()\n\nAs Yanming reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=215894\n\nI have encountered a bug in F2FS file system in kernel v5.17.\n\nI have uploaded the system call sequence as case.c, and a fuzzed image can\nbe found in google net disk\n\nThe kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can\nreproduce the bug by running the following commands:\n\nkernel BUG at fs/f2fs/segment.c:2291!\nCall Trace:\n f2fs_invalidate_blocks+0x193/0x2d0\n f2fs_fallocate+0x2593/0x4a70\n vfs_fallocate+0x2a5/0xac0\n ksys_fallocate+0x35/0x70\n __x64_sys_fallocate+0x8e/0xf0\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is, after image was fuzzed, block mapping info in inode\nwill be inconsistent with SIT table, so in f2fs_fallocate(), it will cause\npanic when updating SIT with invalid blkaddr.\n\nLet's fix the issue by adding sanity check on block address before updating\nSIT table with it." } ], "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 vulnerable path is reached via local VFS fallocate(FALLOC_FL_ZERO_RANGE) on a mounted crafted f2fs image (f2fs_fallocate → f2fs_zero_range → f2fs_do_zero_range → f2fs_invalidate_blocks); f2fs is not a network protocol handler, and exploitation depends on supplying/mounting malicious on-disk metadata locally.\nAC:L - The attacker fully controls the on-disk inode/dnode block addresses in the fuzzed image, so fallocate with ZERO_RANGE|KEEP_SIZE (as in the bugzilla case.c) deterministically hits update_sit_entry with the bad blkaddr; no race or attacker-uncontrollable timing is required.\nPR:L - Once the crafted image is mounted (Android/udisks automount of SD/removable media, shared workstation), triggering requires only an unprivileged local user calling fallocate on a writable file; there is no capability check on the path from vfs_fallocate into f2fs_do_zero_range.\nUI:N - After the malicious image is present and mounted via automount or delegated mount rights, the attacker drives fallocate themselves with no further action by a separate victim user.\nS:U - Corruption and crash remain within the host kernel’s f2fs/SIT memory; this is standard local kernel impact, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - An attacker-chosen data_blkaddr that is outside MAIN_BLKADDR..MAX_BLKADDR is passed unchecked into get_seg_entry(), which indexes sit_i->sentries[segno] with no bounds check, yielding an out-of-bounds read of adjacent kernel heap before any BUG_ON.\nI:H - The same unchecked segno drives OOB writes through update_sit_entry (valid_blocks, cur_valid_map bit ops) and, with default !CONFIG_F2FS_CHECK_FS, f2fs_bug_on only WARNs then continues mutating SIT state—an attacker-controlled heap corruption / metadata-write primitive.\nA:H - The reported impact is a hard kernel BUG at update_sit_entry (f2fs_bug_on on negative/overflow valid_blocks or wrongly cleared SIT bitmap) under CONFIG_F2FS_CHECK_FS/KASAN as in the original reproducer, and OOB accesses can also oops on unmapped memory." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/file.c" ], "versions": [ { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "7361c9f2bd6a8f0cbb41cdea9aff04765ff23f67", "status": "affected", "versionType": "git" }, { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "a34d7b49894b0533222188a52e2958750f830efd", "status": "affected", "versionType": "git" }, { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "f2e1c38b5ac64eb1a16a89c52fb419409d12c25b", "status": "affected", "versionType": "git" }, { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "470493be19a5730ed432e3ac0f29a2ee7fc6c557", "status": "affected", "versionType": "git" }, { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "805b48b234a2803cb7daec7f158af12f0fbaefac", "status": "affected", "versionType": "git" }, { "version": "75cd4e098d178433436abce08146a21647bb4585", "lessThan": "25f8236213a91efdf708b9d77e9e51b6fc3e141c", "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/file.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.198", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.121", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "4.2", "versionEndExcluding": "5.4.198" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.10.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.15.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7361c9f2bd6a8f0cbb41cdea9aff04765ff23f67" }, { "url": "https://git.kernel.org/stable/c/a34d7b49894b0533222188a52e2958750f830efd" }, { "url": "https://git.kernel.org/stable/c/f2e1c38b5ac64eb1a16a89c52fb419409d12c25b" }, { "url": "https://git.kernel.org/stable/c/470493be19a5730ed432e3ac0f29a2ee7fc6c557" }, { "url": "https://git.kernel.org/stable/c/805b48b234a2803cb7daec7f158af12f0fbaefac" }, { "url": "https://git.kernel.org/stable/c/25f8236213a91efdf708b9d77e9e51b6fc3e141c" } ], "title": "f2fs: fix to do sanity check on block address in f2fs_do_zero_range()", "x_generator": { "engine": "bippy-1.2.0" } } } }