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CVE-2024-47679 (GCVE-0-2024-47679)

Vulnerability from cvelistv5 – Published: 2024-10-21 11:53 – Updated: 2026-08-05 11:39
VLAI
Title
vfs: fix race between evice_inodes() and find_inode()&iput()
Summary
In the Linux kernel, the following vulnerability has been resolved: vfs: fix race between evice_inodes() and find_inode()&iput() Hi, all Recently I noticed a bug[1] in btrfs, after digged it into and I believe it'a race in vfs. Let's assume there's a inode (ie ino 261) with i_count 1 is called by iput(), and there's a concurrent thread calling generic_shutdown_super(). cpu0: cpu1: iput() // i_count is 1 ->spin_lock(inode) ->dec i_count to 0 ->iput_final() generic_shutdown_super() ->__inode_add_lru() ->evict_inodes() // cause some reason[2] ->if (atomic_read(inode->i_count)) continue; // return before // inode 261 passed the above check // list_lru_add_obj() // and then schedule out ->spin_unlock() // note here: the inode 261 // was still at sb list and hash list, // and I_FREEING|I_WILL_FREE was not been set btrfs_iget() // after some function calls ->find_inode() // found the above inode 261 ->spin_lock(inode) // check I_FREEING|I_WILL_FREE // and passed ->__iget() ->spin_unlock(inode) // schedule back ->spin_lock(inode) // check (I_NEW|I_FREEING|I_WILL_FREE) flags, // passed and set I_FREEING iput() ->spin_unlock(inode) ->spin_lock(inode) ->evict() // dec i_count to 0 ->iput_final() ->spin_unlock() ->evict() Now, we have two threads simultaneously evicting the same inode, which may trigger the BUG(inode->i_state & I_CLEAR) statement both within clear_inode() and iput(). To fix the bug, recheck the inode->i_count after holding i_lock. Because in the most scenarios, the first check is valid, and the overhead of spin_lock() can be reduced. If there is any misunderstanding, please let me know, thanks. [1]: https://lore.kernel.org/linux-btrfs/000000000000eabe1d0619c48986@google.com/ [2]: The reason might be 1. SB_ACTIVE was removed or 2. mapping_shrinkable() return false when I reproduced the bug.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-21 13:07 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 6cc13a80a26e6b48f78c725c01b91987d61563ef (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 489faddb1ae75b0e1a741fe5ca2542a2b5e794a5 (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 47a68c75052a660e4c37de41e321582ec9496195 (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 3721a69403291e2514d13a7c3af50a006ea1153b (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 540fb13120c9eab3ef203f90c00c8e69f37449d1 (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 0eed942bc65de1f93eca7bda51344290f9c573bb (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 0f8a5b6d0dafa4f533ac82e98f8b812073a7c9d1 (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 6c857fb12b9137fee574443385d53914356bbe11 (git)
Affected: 63997e98a3be68d7cec806d22bf9b02b2e1daabb , < 88b1afbf0f6b221f6c5bb66cc80cd3b38d696687 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 4.19.323 , ≤ 4.19.* (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.54 , ≤ 6.6.* (semver)
Unaffected: 6.10.13 , ≤ 6.10.* (semver)
Unaffected: 6.11.2 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-47679\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T12:15:04.920\",\"lastModified\":\"2026-08-04T11:20:39.413\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvfs: fix race between evice_inodes() and find_inode()\u0026iput()\\n\\nHi, all\\n\\nRecently I noticed a bug[1] in btrfs, after digged it into\\nand I believe it\u0027a race in vfs.\\n\\nLet\u0027s assume there\u0027s a inode (ie ino 261) with i_count 1 is\\ncalled by iput(), and there\u0027s a concurrent thread calling\\ngeneric_shutdown_super().\\n\\ncpu0:                              cpu1:\\niput() // i_count is 1\\n  -\u003espin_lock(inode)\\n  -\u003edec i_count to 0\\n  -\u003eiput_final()                    generic_shutdown_super()\\n    -\u003e__inode_add_lru()               -\u003eevict_inodes()\\n      // cause some reason[2]           -\u003eif (atomic_read(inode-\u003ei_count)) continue;\\n      // return before                  // inode 261 passed the above check\\n      // list_lru_add_obj()             // and then schedule out\\n   -\u003espin_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  -\u003efind_inode()\\n    // found the above inode 261\\n    -\u003espin_lock(inode)\\n   // check I_FREEING|I_WILL_FREE\\n   // and passed\\n      -\u003e__iget()\\n    -\u003espin_unlock(inode)                // schedule back\\n                                        -\u003espin_lock(inode)\\n                                        // check (I_NEW|I_FREEING|I_WILL_FREE) flags,\\n                                        // passed and set I_FREEING\\niput()                                  -\u003espin_unlock(inode)\\n  -\u003espin_lock(inode)\\t\\t\\t  -\u003eevict()\\n  // dec i_count to 0\\n  -\u003eiput_final()\\n    -\u003espin_unlock()\\n    -\u003eevict()\\n\\nNow, we have two threads simultaneously evicting\\nthe same inode, which may trigger the BUG(inode-\u003ei_state \u0026 I_CLEAR)\\nstatement both within clear_inode() and iput().\\n\\nTo fix the bug, recheck the inode-\u003ei_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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vfs: arregla la ejecuci\u00f3n entre evice_inodes() y find_inode()\u0026amp;iput() Hola a todos Recientemente not\u00e9 un error[1] en btrfs, despu\u00e9s de investigarlo y creo que es una ejecuci\u00f3n en vfs. Supongamos que hay un inodo (es decir, ino 261) con i_count 1 que es llamado por iput(), y hay un hilo concurrente que llama a generic_shutdown_super(). cpu0: cpu1: iput() // i_count es 1 -\u0026gt;spin_lock(inode) -\u0026gt;dec i_count a 0 -\u0026gt;iput_final() generic_shutdown_super() -\u0026gt;__inode_add_lru() -\u0026gt;evict_inodes() // por alguna raz\u00f3n[2] -\u0026gt;if (atomic_read(inode-\u0026gt;i_count)) continue; // regresar antes // el inodo 261 pas\u00f3 la verificaci\u00f3n anterior // list_lru_add_obj() // y luego programar la salida -\u0026gt;spin_unlock() // nota aqu\u00ed: el inodo 261 // todav\u00eda estaba en la lista sb y la lista hash, // y I_FREEING|I_WILL_FREE no se hab\u00eda establecido btrfs_iget() // despu\u00e9s de algunas llamadas de funci\u00f3n -\u0026gt;find_inode() // encontr\u00f3 el inodo 261 anterior -\u0026gt;spin_lock(inode) // verific\u00f3 I_FREEING|I_WILL_FREE // y pas\u00f3 -\u0026gt;__iget() -\u0026gt;spin_unlock(inode) // program\u00f3 de regreso -\u0026gt;spin_lock(inode) // verific\u00f3 los indicadores (I_NEW|I_FREEING|I_WILL_FREE), // pas\u00f3 y estableci\u00f3 I_FREEING iput() -\u0026gt;spin_unlock(inode) -\u0026gt;spin_lock(inode) -\u0026gt;evict() // dec i_count a 0 -\u0026gt;iput_final() -\u0026gt;spin_unlock() -\u0026gt;evict() Ahora, tenemos dos subprocesos expulsando simult\u00e1neamente el mismo inodo, lo que puede activar la declaraci\u00f3n BUG(inode-\u0026gt;i_state \u0026amp; I_CLEAR) tanto dentro de clear_inode() como de iput(). Para corregir el error, vuelva a verificar inode-\u0026gt;i_count despu\u00e9s de mantener i_lock. Porque en la mayor\u00eda de los escenarios, la primera verificaci\u00f3n es v\u00e1lida y se puede reducir la sobrecarga de spin_lock(). Si hay alg\u00fan malentendido, h\u00e1gamelo saber, gracias. [1]: https://lore.kernel.org/linux-btrfs/000000000000eabe1d0619c48986@google.com/ [2]: La raz\u00f3n podr\u00eda ser 1. SB_ACTIVE fue eliminado o 2. mapping_shrinkable() devolvi\u00f3 falso cuando reproduje el 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T17:53:14+00:00",
      "cve": "CVE-2024-47679",
      "id": "CVE-2024-47679",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:fixed": "303",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vfs: fix race between evice_inodes() and find_inode()\u0026#38;iput()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-47679.json",
      "version": "3"
    },
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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(\u0026inode-\u003ei_count)` and `spin_lock(\u0026inode-\u003ei_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\u0027s `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 \\u2014 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-\u003ei_state \u0026 I_CLEAR)` in `clear_inode()` and `BUG_ON(inode-\u003ei_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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", 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\"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.54\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/inode.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvfs: fix race between evice_inodes() and find_inode()\u0026iput()\\n\\nHi, all\\n\\nRecently I noticed a bug[1] in btrfs, after digged it into\\nand I believe it\u0027a race in vfs.\\n\\nLet\u0027s assume there\u0027s a inode (ie ino 261) with i_count 1 is\\ncalled by iput(), and there\u0027s a concurrent thread calling\\ngeneric_shutdown_super().\\n\\ncpu0:                              cpu1:\\niput() // i_count is 1\\n  -\u003espin_lock(inode)\\n  -\u003edec i_count to 0\\n  -\u003eiput_final()                    generic_shutdown_super()\\n    -\u003e__inode_add_lru()               -\u003eevict_inodes()\\n      // cause some reason[2]           -\u003eif (atomic_read(inode-\u003ei_count)) continue;\\n      // return before                  // inode 261 passed the above check\\n      // list_lru_add_obj()             // and then schedule out\\n   -\u003espin_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  -\u003efind_inode()\\n    // found the above inode 261\\n    -\u003espin_lock(inode)\\n   // check I_FREEING|I_WILL_FREE\\n   // and passed\\n      -\u003e__iget()\\n    -\u003espin_unlock(inode)                // schedule back\\n                                        -\u003espin_lock(inode)\\n                                        // check (I_NEW|I_FREEING|I_WILL_FREE) flags,\\n                                        // passed and set I_FREEING\\niput()                                  -\u003espin_unlock(inode)\\n  -\u003espin_lock(inode)\\t\\t\\t  -\u003eevict()\\n  // dec i_count to 0\\n  -\u003eiput_final()\\n    -\u003espin_unlock()\\n    -\u003eevict()\\n\\nNow, we have two threads simultaneously evicting\\nthe same inode, which may trigger the BUG(inode-\u003ei_state \u0026 I_CLEAR)\\nstatement both within clear_inode() and iput().\\n\\nTo fix the bug, recheck the inode-\u003ei_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.54\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.13\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.2\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"2.6.37\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:39:25.078Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-47679\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:39:25.078Z\", \"dateReserved\": \"2024-09-30T16:00:12.939Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T11:53:22.469Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.