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vuln-cve/data/2024/47xxx/CVE-2024-47679.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-47679",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-09-30T16:00:12.939Z",
"datePublished": "2024-10-21T11:53:22.469Z",
"dateUpdated": "2026-08-05T11:39:25.078Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:39:25.078Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfs: fix race between evice_inodes() and find_inode()&iput()\n\nHi, all\n\nRecently I noticed a bug[1] in btrfs, after digged it into\nand I believe it'a race in vfs.\n\nLet's assume there's a inode (ie ino 261) with i_count 1 is\ncalled by iput(), and there's a concurrent thread calling\ngeneric_shutdown_super().\n\ncpu0: cpu1:\niput() // i_count is 1\n ->spin_lock(inode)\n ->dec i_count to 0\n ->iput_final() generic_shutdown_super()\n ->__inode_add_lru() ->evict_inodes()\n // cause some reason[2] ->if (atomic_read(inode->i_count)) continue;\n // return before // inode 261 passed the above check\n // list_lru_add_obj() // and then schedule out\n ->spin_unlock()\n// note here: the inode 261\n// was still at sb list and hash list,\n// and I_FREEING|I_WILL_FREE was not been set\n\nbtrfs_iget()\n // after some function calls\n ->find_inode()\n // found the above inode 261\n ->spin_lock(inode)\n // check I_FREEING|I_WILL_FREE\n // and passed\n ->__iget()\n ->spin_unlock(inode) // schedule back\n ->spin_lock(inode)\n // check (I_NEW|I_FREEING|I_WILL_FREE) flags,\n // passed and set I_FREEING\niput() ->spin_unlock(inode)\n ->spin_lock(inode)\t\t\t ->evict()\n // dec i_count to 0\n ->iput_final()\n ->spin_unlock()\n ->evict()\n\nNow, we have two threads simultaneously evicting\nthe same inode, which may trigger the BUG(inode->i_state & I_CLEAR)\nstatement both within clear_inode() and iput().\n\nTo fix the bug, recheck the inode->i_count after holding i_lock.\nBecause in the most scenarios, the first check is valid, and\nthe overhead of spin_lock() can be reduced.\n\nIf there is any misunderstanding, please let me know, thanks.\n\n[1]: https://lore.kernel.org/linux-btrfs/000000000000eabe1d0619c48986@google.com/\n[2]: The reason might be 1. SB_ACTIVE was removed or 2. mapping_shrinkable()\nreturn false when I reproduced the bug."
}
],
"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 race requires local syscalls — `umount()` to drive `generic_shutdown_super()`→`evict_inodes()` plus concurrent `open()`/`close()` to drive `find_inode()`/`iput()` on the same inode. No network protocol handler reaches this path.\nAC:L - The attacker controls every side of the race: it stages inodes at `i_count==0` with page cache (making `__inode_add_lru()` bail), hammers lookups on them from parallel threads, and issues the unmount itself, retrying the whole cycle indefinitely until the window between the unlocked `atomic_read(&inode->i_count)` and `spin_lock(&inode->i_lock)` is hit; syzbot reproduced it automatically.\nPR:L - An ordinary unprivileged user can mount and unmount FUSE or overlayfs inside a user namespace (`FS_USERNS_MOUNT`, `unshare -Urm`), and FUSE's `iget5_locked()` lookups supply the racing `find_inode()`; no real root or init-namespace capability is needed.\nUI:N - The attacker performs the mount, the file accesses, and the unmount entirely on its own; no action by another user or administrator is required.\nS:U - The corruption stays within the kernel of the same machine — a standard local kernel memory-safety issue with no crossing of a VM, hypervisor, or IOMMU boundary.\nC:H - Double eviction leads to `destroy_inode()` twice on the same slab object, a double-free/UAF the attacker can reclaim with controlled data, yielding an arbitrary kernel-memory read primitive and disclosure of any data on the system.\nI:H - The same double-free/UAF on the inode cache allows heap grooming and type confusion between the stale inode and a reclaimed object, giving arbitrary kernel write and a realistic path to privilege escalation.\nA:H - The immediate observable effect is `BUG_ON(inode->i_state & I_CLEAR)` in `clear_inode()` and `BUG_ON(inode->i_state != (I_FREEING|I_CLEAR))` in `evict()`, i.e. a kernel panic, and the slab double-free crashes the system even when not exploited further."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
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"status": "affected",
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},
{
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"status": "affected",
"versionType": "git"
},
{
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},
{
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{
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},
{
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{
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"lessThan": "6c857fb12b9137fee574443385d53914356bbe11",
"status": "affected",
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},
{
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"lessThan": "88b1afbf0f6b221f6c5bb66cc80cd3b38d696687",
"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/inode.c"
],
"versions": [
{
"version": "2.6.37",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.37",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.19.323",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.285",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.227",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
{
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"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": "2.6.37",
"versionEndExcluding": "4.19.323"
},
{
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{
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},
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/6cc13a80a26e6b48f78c725c01b91987d61563ef"
},
{
"url": "https://git.kernel.org/stable/c/489faddb1ae75b0e1a741fe5ca2542a2b5e794a5"
},
{
"url": "https://git.kernel.org/stable/c/47a68c75052a660e4c37de41e321582ec9496195"
},
{
"url": "https://git.kernel.org/stable/c/3721a69403291e2514d13a7c3af50a006ea1153b"
},
{
"url": "https://git.kernel.org/stable/c/540fb13120c9eab3ef203f90c00c8e69f37449d1"
},
{
"url": "https://git.kernel.org/stable/c/0eed942bc65de1f93eca7bda51344290f9c573bb"
},
{
"url": "https://git.kernel.org/stable/c/0f8a5b6d0dafa4f533ac82e98f8b812073a7c9d1"
},
{
"url": "https://git.kernel.org/stable/c/6c857fb12b9137fee574443385d53914356bbe11"
},
{
"url": "https://git.kernel.org/stable/c/88b1afbf0f6b221f6c5bb66cc80cd3b38d696687"
}
],
"title": "vfs: fix race between evice_inodes() and find_inode()&iput()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2024-47679",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-10-21T13:07:33.659444Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2024-10-21T13:14:16.951Z"
}
},
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T22:20:46.317Z"
}
}
]
}
}
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