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CVE-2025-38615 (GCVE-0-2025-38615)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-08-05 12:03
VLAI
Title
fs/ntfs3: cancle set bad inode after removing name fails
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: cancle set bad inode after removing name fails The reproducer uses a file0 on a ntfs3 file system with a corrupted i_link. When renaming, the file0's inode is marked as a bad inode because the file name cannot be deleted. The underlying bug is that make_bad_inode() is called on a live inode. In some cases it's "icache lookup finds a normal inode, d_splice_alias() is called to attach it to dentry, while another thread decides to call make_bad_inode() on it - that would evict it from icache, but we'd already found it there earlier". In some it's outright "we have an inode attached to dentry - that's how we got it in the first place; let's call make_bad_inode() on it just for shits and giggles".
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 78ab59fee07f22464f32eafebab2bd97ba94ff2d , < b35a50d639ca5259466ef5fea85529bb4fb17d5b (git)
Affected: 78ab59fee07f22464f32eafebab2bd97ba94ff2d , < 3ed2cc6a6e93fbeb8c0cafce1e7fb1f64a331dcc (git)
Affected: 78ab59fee07f22464f32eafebab2bd97ba94ff2d , < 358d4f821c03add421a4c49290538a705852ccf1 (git)
Affected: 78ab59fee07f22464f32eafebab2bd97ba94ff2d , < a285395020780adac1ffbc844069c3d700bf007a (git)
Affected: 78ab59fee07f22464f32eafebab2bd97ba94ff2d , < d99208b91933fd2a58ed9ed321af07dacd06ddc3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

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              "value": "AV:L - The vulnerability is reached purely through local syscalls \u2014 `renameat2()` on a mounted ntfs3 volume followed by `openat()` on the affected path; there is no remote or network-facing consumer of this code.\nAC:L - The attacker crafts the NTFS image so `ni_remove_name()` deterministically fails, and drives both sides of the `d_splice_alias()`/`make_bad_inode()` window with its own threads (a rename loop plus a lookup/open loop), so no condition lies outside its control; the downstream `S_ISDIR` bypass and inode-unhashing consequences need no race at all.\nPR:L - Renaming and opening files on a mounted ntfs3 volume are ordinary unprivileged operations, and ntfs3 mounts default to permissive uid/gid/fmask/dmask permissions; the mount itself is obtained without any elevated credentials via udisks2 loop-setup/filesystem-mount, which are granted to active local sessions by default.\nUI:N - The attacker performs every step alone \u2014 supplying the crafted image, mounting it through udisks2 or removable-media auto-mount, then issuing the rename and open; no action by any other user is required.\nS:U - The wild-pointer dereference and inode/dcache state corruption occur entirely within the kernel\u0027s own security authority, crossing no VM, IOMMU, or sandbox boundary.\nC:H - `pick_link()` dereferences `inode-\u003ei_link`, which actually holds `i_dir_seq` \u2014 a value the attacker inflates by adding directory entries \u2014 and consumes the target bytes as a symlink body steering path resolution, so on configurations without SMAP/PAN this yields an attacker-directed read primitive; the duplicate-inode aliasing additionally cross-links clusters between unrelated files.\nI:H - The corrupted symlink body redirects path resolution to attacker-chosen targets, the `S_IFDIR\u2192S_IFREG` flip bypasses the non-empty-directory guard in `ntfs_unlink_inode()` allowing live directories to be unlinked, and duplicate `ntfs_inode`s for one MFT record double-free clusters \u2014 a memory- and metadata-corruption primitive steerable toward control-flow hijack.\nA:H - syzbot reproduced a general protection fault / KASAN null-ptr-deref in `pick_link()` from `do_sys_openat2()`, and the unhashed live inode plus `ni-\u003edir`/`ni-\u003efile` union confusion produce further oopses \u2014 any of which panics the kernel."
            }
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        "dateUpdated": "2026-08-05T12:03:30.645Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38615",
    "datePublished": "2025-08-19T17:03:57.164Z",
    "dateReserved": "2025-04-16T04:51:24.029Z",
    "dateUpdated": "2026-08-05T12:03:30.645Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
      "epss": "0.00168",
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    },
    "microsoft_vex": {
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      "cve": "CVE-2025-38615",
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      "product_status:known_not_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fs/ntfs3: cancle set bad inode after removing name fails",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38615.json",
      "version": "4"
    },
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El reproductor usa un archivo \\\"file0\\\" en un sistema de archivos ntfs3 con un i_link da\u00f1ado. Al renombrar, el inodo de archivo \\\"file0\\\" se marca como err\u00f3neo porque no se puede eliminar el nombre del archivo. El error subyacente radica en que se llama a make_bad_inode() en un inodo activo. En algunos casos, la b\u00fasqueda de icache encuentra un inodo normal, se llama a d_splice_alias() para asociarlo a dentry, mientras que otro hilo decide llamar a make_bad_inode() en \u00e9l; eso lo expulsar\u00eda de icache, pero ya lo hab\u00edamos encontrado all\u00ed anteriormente. En otros casos, es simplemente: \\\"Tenemos un inodo asociado a dentry; as\u00ed es como lo obtuvimos; llamemos a make_bad_inode() en \u00e9l, solo por 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:22:47+00:00",
      "cve": "CVE-2025-38615",
      "id": "CVE-2025-38615",
      "initial_release_date": "2025-08-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: cancle set bad inode after removing name fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38615.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:14:20Z",
      "cve": "CVE-2025-38615",
      "id": "CVE-2025-38615",
      "initial_release_date": "2025-08-19T23:22:48Z",
      "product_status:known_not_affected": "538",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38615",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38615.json",
      "version": "13"
    }
  }
}



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