CVE-2025-38577Public exploit

Kernel panic via stale f2fs inode entry

Published Aug 19, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux f2fs filesystem allows local users to panic the kernel through operations on a crafted mounted filesystem. Error paths in f2fs_evict_inode omit f2fs_inode_synced, leaving a freed inode on the dirty-metadata list for later checkpoint dereference. The trigger requires local access to the mounted f2fs volume; successful exploitation interrupts the host through a kernel panic.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux f2fs filesystem allows local users to panic the kernel through operations on a crafted mounted filesystem. Error paths in f2fs_evict_inode omit f2fs_inode_synced, leaving a freed inode on the dirty-metadata list for later checkpoint dereference. The trigger requires local access to the mounted f2fs volume; successful exploitation interrupts the host through a kernel panic.

The record

CVE
CVE-2025-38577
Published
Aug 19, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <15df59809c54fbd687cdf27efbd2103a937459be
  2. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <42f9ea16aea8b49febaa87950a006a1792209f38
  3. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <4732ca17c17f5062426cfa982f43593e6b81963b
  4. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <5cd99d5aa3d39086bdb53eb5c52df16e98b101a0
  5. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <880ef748e78a1eb7df2d8e11a9ef21e98bcaabe5
  6. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <9535e440fe5bc6c5ac7cfb407e53bf788b8bf8d4
  7. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <97df495d754116c8c28ac6a4112f831727bde887
  8. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <9bbfe83924946552c4c513099c0e8c83af76311a
  9. Affected versionversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <a509a55f8eecc8970b3980c6f06886bbff0e2f68
  10. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0f18b462b2e5aff64b8638e8a47284b907351ef3 <15df59809c54fbd687cdf27efbd2103a937459be; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <42f9ea16aea8b49febaa87950a006a1792209f38; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <4732ca17c17f5062426cfa982f43593e6b81963b; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <5cd99d5aa3d39086bdb53eb5c52df16e98b101a0; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <880ef748e78a1eb7df2d8e11a9ef21e98bcaabe5; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <9535e440fe5bc6c5ac7cfb407e53bf788b8bf8d4; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <97df495d754116c8c28ac6a4112f831727bde887; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <9bbfe83924946552c4c513099c0e8c83af76311a; version=0f18b462b2e5aff64b8638e8a47284b907351ef3 <a509a55f8eecc8970b3980c6f06886bbff0e2f68; version=4.8

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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Technologies

Your stack

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Your stack

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