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EUVD-2026-346166

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:07

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:07:17.915413+00:00",
  "id": "EUVD-2026-346166"
}

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

Vulnerability from cvelistv5 – Published: 2024-10-21 11:53 – Updated: 2026-08-05 11:39

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

Linux mitre root Scorecard

References

11 references

URL	Tags
https://git.kernel.org/stable/c/6cc13a80a26e6b48f…
https://git.kernel.org/stable/c/489faddb1ae75b0e1…
https://git.kernel.org/stable/c/47a68c75052a660e4…
https://git.kernel.org/stable/c/3721a69403291e251…
https://git.kernel.org/stable/c/540fb13120c9eab3e…
https://git.kernel.org/stable/c/0eed942bc65de1f93…
https://git.kernel.org/stable/c/0f8a5b6d0dafa4f53…
https://git.kernel.org/stable/c/6c857fb12b9137fee…
https://git.kernel.org/stable/c/88b1afbf0f6b221f6…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2024-47679",
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-21T13:07:33.659444Z",
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            {
              "lessThan": "2.6.37",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "version": "6.11.2",
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              "version": "6.12",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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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."
        }
      ],
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              "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",
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      },
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        {
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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",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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EUVD-2026-346166

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

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