{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-47690", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.942Z", "datePublished": "2024-10-21T11:53:29.870Z", "dateUpdated": "2026-08-05T11:39:27.223Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:27.223Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: get rid of online repaire on corrupted directory\n\nsyzbot reports a f2fs bug as below:\n\nkernel BUG at fs/f2fs/inode.c:896!\nRIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896\nCall Trace:\n evict+0x532/0x950 fs/inode.c:704\n dispose_list fs/inode.c:747 [inline]\n evict_inodes+0x5f9/0x690 fs/inode.c:797\n generic_shutdown_super+0x9d/0x2d0 fs/super.c:627\n kill_block_super+0x44/0x90 fs/super.c:1696\n kill_f2fs_super+0x344/0x690 fs/f2fs/super.c:4898\n deactivate_locked_super+0xc4/0x130 fs/super.c:473\n cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373\n task_work_run+0x24f/0x310 kernel/task_work.c:228\n ptrace_notify+0x2d2/0x380 kernel/signal.c:2402\n ptrace_report_syscall include/linux/ptrace.h:415 [inline]\n ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]\n syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173\n syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]\n __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]\n syscall_exit_to_user_mode+0x279/0x370 kernel/entry/common.c:218\n do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896\n\nOnline repaire on corrupted directory in f2fs_lookup() can generate\ndirty data/meta while racing w/ readonly remount, it may leave dirty\ninode after filesystem becomes readonly, however, checkpoint() will\nskips flushing dirty inode in a state of readonly mode, result in\nabove panic.\n\nLet's get rid of online repaire in f2fs_lookup(), and leave the work\nto fsck.f2fs." } ], "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 vulnerability is reached through local filesystem operations — mounting an f2fs image, ordinary path lookup syscalls, and a remount — with no network protocol involved. Even in the removable-media/automount scenario the triggering actions are local syscalls, and Local scores higher than Physical.\nAC:L - The attacker controls both sides of the race (a lookup loop against `mount -o remount,ro`) and can repeat it indefinitely until the window is hit; the `f2fs_readonly()` check in `__recover_dot_dentries()` is checked once with no locking against the remount. Setting the on-disk `F2FS_INLINE_DOTS` bit is trivial and requires no special conditions.\nPR:L - Reaching `f2fs_lookup()` and thus `__recover_dot_dentries()` requires only an unprivileged local account with search access to the mount; the flag arrives from disk via a crafted image or a legacy mkfs.f2fs volume that an automount daemon (Android vold, udisks2) mounts on the attacker's behalf. No capability check exists anywhere on the lookup path.\nUI:N - No victim action is needed — the attacker performs the lookups, remount and unmount itself, and in the removable-media case the automount daemon mounts the volume without any user interaction.\nS:U - The corruption and the resulting panic/use-after-free are confined to the kernel's own memory and the f2fs superblock structures; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the WARN path leaves the evicted inode linked in `sbi->inode_list[DIRTY_META]`, `f2fs_sync_inode_meta()` reads a freed `f2fs_inode_info` via `list_first_entry()` and `igrab()`, giving a use-after-free read of reclaimed slab memory that can be heap-sprayed to disclose kernel data.\nI:H - The same dangling `gdirty_list` entry yields UAF writes through `list_del_init()` in `f2fs_inode_synced()` and `f2fs_update_inode_page()` operating on a reclaimed object, a well-known primitive for heap-spray-based control-flow hijack; the bug additionally leaves persistent on-disk metadata inconsistency requiring fsck.\nA:H - The reported failure is an outright kernel panic at `fs/f2fs/inode.c:896` (`BUG_ON` under CONFIG_F2FS_CHECK_FS, or WARN plus a subsequent use-after-free oops otherwise), triggered on unmount and reproducible on demand." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/f2fs.h", "fs/f2fs/namei.c", "include/linux/f2fs_fs.h" ], "versions": [ { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "e8d64f598eeb079c42a52deaa3a91312c736a49d", "status": "affected", "versionType": "git" }, { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "f4746f2d79507f65cfbde11d3c39ee8338aa50af", "status": "affected", "versionType": "git" }, { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "f9ce2f550d53d044ecfb5ce996406cf42cd6b84d", "status": "affected", "versionType": "git" }, { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "8be95cd607478d85fa4626e86f811e785905bcbf", "status": "affected", "versionType": "git" }, { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "bcefd0b0611f35b560d0a7281d87529fbe7a1e32", "status": "affected", "versionType": "git" }, { "version": "510022a85839a8409d1e6a519bb86ce71a84f30a", "lessThan": "884ee6dc85b959bc152f15bca80c30f06069e6c4", "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/f2fs.h", "fs/f2fs/namei.c", "include/linux/f2fs_fs.h" ], "versions": [ { "version": "4.1", "status": "affected" }, { "version": "0", "lessThan": "4.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "4.1", "versionEndExcluding": "5.15.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.1.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.6.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.10.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.11.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e8d64f598eeb079c42a52deaa3a91312c736a49d" }, { "url": "https://git.kernel.org/stable/c/f4746f2d79507f65cfbde11d3c39ee8338aa50af" }, { "url": "https://git.kernel.org/stable/c/f9ce2f550d53d044ecfb5ce996406cf42cd6b84d" }, { "url": "https://git.kernel.org/stable/c/8be95cd607478d85fa4626e86f811e785905bcbf" }, { "url": "https://git.kernel.org/stable/c/bcefd0b0611f35b560d0a7281d87529fbe7a1e32" }, { "url": "https://git.kernel.org/stable/c/884ee6dc85b959bc152f15bca80c30f06069e6c4" } ], "title": "f2fs: get rid of online repaire on corrupted directory", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-47690", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-21T13:06:03.889382Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:14:15.315Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:20:55.203Z" } } ] } }