CVE-2025-37904 (GCVE-0-2025-37904)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:21 – Updated: 2026-05-11 21:17
VLAI?
Title
btrfs: fix the inode leak in btrfs_iget()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix the inode leak in btrfs_iget() [BUG] There is a bug report that a syzbot reproducer can lead to the following busy inode at unmount time: BTRFS info (device loop1): last unmount of filesystem 1680000e-3c1e-4c46-84b6-56bd3909af50 VFS: Busy inodes after unmount of loop1 (btrfs) ------------[ cut here ]------------ kernel BUG at fs/super.c:650! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 48168 Comm: syz-executor Not tainted 6.15.0-rc2-00471-g119009db2674 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:generic_shutdown_super+0x2e9/0x390 fs/super.c:650 Call Trace: <TASK> kill_anon_super+0x3a/0x60 fs/super.c:1237 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2099 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xe2/0x100 fs/super.c:502 cleanup_mnt+0x21f/0x440 fs/namespace.c:1435 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x269/0x290 kernel/entry/common.c:218 do_syscall_64+0xd4/0x250 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> [CAUSE] When btrfs_alloc_path() failed, btrfs_iget() directly returned without releasing the inode already allocated by btrfs_iget_locked(). This results the above busy inode and trigger the kernel BUG. [FIX] Fix it by calling iget_failed() if btrfs_alloc_path() failed. If we hit error inside btrfs_read_locked_inode(), it will properly call iget_failed(), so nothing to worry about. Although the iget_failed() cleanup inside btrfs_read_locked_inode() is a break of the normal error handling scheme, let's fix the obvious bug and backport first, then rework the error handling later.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7c855e16ab72596d771355050ffe026e6b99f91c , < 30a339bece3a44ab0a821477139e84fb86af9761 (git)
Affected: 7c855e16ab72596d771355050ffe026e6b99f91c , < 48c1d1bb525b1c44b8bdc8e7ec5629cb6c2b9fc4 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.14.6 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/inode.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            }
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        {
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            "fs/btrfs/inode.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.13"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.6",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix the inode leak in btrfs_iget()\n\n[BUG]\nThere is a bug report that a syzbot reproducer can lead to the following\nbusy inode at unmount time:\n\n  BTRFS info (device loop1): last unmount of filesystem 1680000e-3c1e-4c46-84b6-56bd3909af50\n  VFS: Busy inodes after unmount of loop1 (btrfs)\n  ------------[ cut here ]------------\n  kernel BUG at fs/super.c:650!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  CPU: 0 UID: 0 PID: 48168 Comm: syz-executor Not tainted 6.15.0-rc2-00471-g119009db2674 #2 PREEMPT(full)\n  Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n  RIP: 0010:generic_shutdown_super+0x2e9/0x390 fs/super.c:650\n  Call Trace:\n   \u003cTASK\u003e\n   kill_anon_super+0x3a/0x60 fs/super.c:1237\n   btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2099\n   deactivate_locked_super+0xbe/0x1a0 fs/super.c:473\n   deactivate_super fs/super.c:506 [inline]\n   deactivate_super+0xe2/0x100 fs/super.c:502\n   cleanup_mnt+0x21f/0x440 fs/namespace.c:1435\n   task_work_run+0x14d/0x240 kernel/task_work.c:227\n   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]\n   exit_to_user_mode_loop kernel/entry/common.c:114 [inline]\n   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]\n   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]\n   syscall_exit_to_user_mode+0x269/0x290 kernel/entry/common.c:218\n   do_syscall_64+0xd4/0x250 arch/x86/entry/syscall_64.c:100\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   \u003c/TASK\u003e\n\n[CAUSE]\nWhen btrfs_alloc_path() failed, btrfs_iget() directly returned without\nreleasing the inode already allocated by btrfs_iget_locked().\n\nThis results the above busy inode and trigger the kernel BUG.\n\n[FIX]\nFix it by calling iget_failed() if btrfs_alloc_path() failed.\n\nIf we hit error inside btrfs_read_locked_inode(), it will properly call\niget_failed(), so nothing to worry about.\n\nAlthough the iget_failed() cleanup inside btrfs_read_locked_inode() is a\nbreak of the normal error handling scheme, let\u0027s fix the obvious bug\nand backport first, then rework the error handling later."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:17:21.520Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30a339bece3a44ab0a821477139e84fb86af9761"
        },
        {
          "url": "https://git.kernel.org/stable/c/48c1d1bb525b1c44b8bdc8e7ec5629cb6c2b9fc4"
        }
      ],
      "title": "btrfs: fix the inode leak in btrfs_iget()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37904",
    "datePublished": "2025-05-20T15:21:38.075Z",
    "dateReserved": "2025-04-16T04:51:23.965Z",
    "dateUpdated": "2026-05-11T21:17:21.520Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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