CVE-2025-37904

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-05-20. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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: 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

[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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

May 20, 2025

Last Modified

November 17, 2025

References (2)

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.14.0-24.24) @ plucky2026-05-30ubuntu
ubuntulinux-tools-oem-6.14 (6.14.0-1007.7) @ noble2026-05-30ubuntu
ubuntulinux-tools-aws-64k-6.14 (6.14.0-1009.9) @ plucky2026-05-30ubuntu
ubuntulinux-tools-azure-6.14 (6.14.0-1010.10) @ plucky2026-05-30ubuntu
ubuntulinux-tools-aws-edge (6.14.0-1009.9~24.04.1) @ noble2026-05-30ubuntu
ubuntulinux-tools-oracle-64k-6.14 (6.14.0-1009.9) @ plucky2026-05-30ubuntu
linuxKernel @ 6.14.6—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-25 14:17 UTCEPSS rescore
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  4. 2026-07-24 14:17 UTCEPSS rescore
  5. 2026-07-24 05:41 UTCOSV refresh
  6. 2026-07-23 02:54 UTCEG score recompute
  7. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-11 08:27 UTCEPSS rescore
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  5. 2026-07-07 13:45 UTCEPSS rescore
  6. 2026-07-07 01:21 UTCOSV refresh
  7. 2026-07-06 16:27 UTCEPSS rescore
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  9. 2026-07-05 02:30 UTCEPSS rescore
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  37. 2026-06-18 17:52 UTCEPSS rescore
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  39. 2026-06-18 12:05 UTCOSV refresh
  40. 2026-06-17 17:52 UTCEPSS rescore
  41. 2026-06-16 17:52 UTCEPSS rescore
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  43. 2026-06-14 23:17 UTCEPSS rescore
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  45. 2026-06-12 23:11 UTCEPSS rescore
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  47. 2026-06-10 22:18 UTCEPSS rescore
  48. 2026-06-10 13:22 UTCEPSS rescore
  49. 2026-06-08 14:16 UTCEPSS rescore
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  51. 2026-06-07 15:24 UTCEPSS rescore
  52. 2026-06-06 13:47 UTCEPSS rescore
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  66. 2026-05-30 05:02 UTCEG score recompute
  67. 2026-05-30 05:02 UTCVendor advisory
  68. 2026-05-30 05:02 UTCGHSA enrichment
  69. 2026-05-29 23:42 UTCOSV refresh
  70. 2026-05-29 13:44 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-37904?
CVE-2025-37904 is a medium vulnerability published on May 20, 2025. 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…
When was CVE-2025-37904 disclosed?
CVE-2025-37904 was first published in the National Vulnerability Database on May 20, 2025, with the most recent update on November 17, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-37904 actively exploited?
CVE-2025-37904 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.1% of all scored CVEs.
What is the CVSS score of CVE-2025-37904?
CVE-2025-37904 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-37904?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-37904, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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