CVE-2025-38710

Kernel memory corruption via unchecked exhash depth

Published Sep 4, 2025 · Updated Aug 5, 2026

Improper validation in the GFS2 filesystem in Linux allows local users to corrupt kernel memory by accessing a crafted volume. gfs2_dinode_in accepts an exhash directory i_depth of zero, so dir_e_read shifts by 32 and derives an attacker-chosen out-of-bounds index. The crafted filesystem must be mounted, normally requiring CAP_SYS_ADMIN or delegated mounting; a lookup can expose kernel data, misdirect metadata writes, hang the mount, or panic the kernel.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper validation in the GFS2 filesystem in Linux allows local users to corrupt kernel memory by accessing a crafted volume. gfs2_dinode_in accepts an exhash directory i_depth of zero, so dir_e_read shifts by 32 and derives an attacker-chosen out-of-bounds index. The crafted filesystem must be mounted, normally requiring CAP_SYS_ADMIN or delegated mounting; a lookup can expose kernel data, misdirect metadata writes, hang the mount, or panic the kernel.

The record

CVE
CVE-2025-38710
Published
Sep 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 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=2.6.26
  2. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <076e992752e4b24178918f748d75597c80a408d2
  3. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <112bb60cd0e254a369e95aa9941a694ffeca089f
  4. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <366183911b153e9b8cf758e1414e1154d7569337
  5. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <53a0249d68a210c16e961b83adfa82f94ee0a53d
  6. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <557c024ca7250bb65ae60f16c02074106c2f197b
  7. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <9680c58675b82348ab84d387e4fa727f7587e1a0
  8. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <b5f46951e62377b6e406fadc18bc3c5bdf1632a7
  9. Affected versionversion=9a0045088d888c9c539c8c626a366cb52c0fbdab <cddea0c721106ea480371412d8de21705eb27376

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <076e992752e4b24178918f748d75597c80a408d2; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <112bb60cd0e254a369e95aa9941a694ffeca089f; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <366183911b153e9b8cf758e1414e1154d7569337; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <53a0249d68a210c16e961b83adfa82f94ee0a53d; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <557c024ca7250bb65ae60f16c02074106c2f197b; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <9680c58675b82348ab84d387e4fa727f7587e1a0; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <b5f46951e62377b6e406fadc18bc3c5bdf1632a7; version=9a0045088d888c9c539c8c626a366cb52c0fbdab <cddea0c721106ea480371412d8de21705eb27376

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5CanonicalCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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