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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.
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          "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 error."
        }
      ],
      "id": "CVE-2024-47679",
      "lastModified": "2024-11-08T16:15:24.843",
      "metrics": {
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      "published": "2024-10-21T12:15:04.920",
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      "cve": "CVE-2024-47679",
      "id": "msrc_CVE-2024-47679",
      "initial_release_date": "2024-10-01T07:00:00.000Z",
      "product_status:fixed": "5",
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      "source": "Microsoft CSAF VEX",
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      "title": "vfs: fix race between evice_inodes() and find_inode()\u0026iput()",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-47679.json",
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          {
            "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 error."
          }
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        "id": "CVE-2024-47679",
        "lastModified": "2026-08-04T11:20:39.413",
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              "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."
            }
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                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The race requires local syscalls \u2014 `umount()` to drive `generic_shutdown_super()`\u2192`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(\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."
                }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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              "url": "https://git.kernel.org/stable/c/88b1afbf0f6b221f6c5bb66cc80cd3b38d696687"
            }
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          "title": "vfs: fix race between evice_inodes() and find_inode()\u0026iput()",
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-47679",
        "datePublished": "2024-10-21T11:53:22.469Z",
        "dateReserved": "2024-09-30T16:00:12.939Z",
        "dateUpdated": "2026-08-05T11:39:25.078Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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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

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.