CVE-2025-37780

Kernel memory exposure via undersized file handle

Published May 1, 2025 · Updated May 11, 2026

Out-of-bounds read in the Linux isofs export code allows local users to expose kernel memory or crash the system via a short file handle. The isofs_fh_to_parent path reads the 16-byte parent_block member after handle_to_path allocates only the attacker-supplied 12-byte f_handle buffer. Reaching the read through open_by_handle_at requires CAP_DAC_READ_SEARCH; the reported consequence is a four-byte kernel out-of-bounds read that can disclose memory or interrupt service.

CVSS severity7.1
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux isofs export code allows local users to expose kernel memory or crash the system via a short file handle. The isofs_fh_to_parent path reads the 16-byte parent_block member after handle_to_path allocates only the attacker-supplied 12-byte f_handle buffer. Reaching the read through open_by_handle_at requires CAP_DAC_READ_SEARCH; the reported consequence is a four-byte kernel out-of-bounds read that can disclose memory or interrupt service.

The record

CVE
CVE-2025-37780
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <007124c896e7d4614ac1f6bd4dedb975c35a2a8e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0405d4b63d082861f4eaff9d39c78ee9dc34f845
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0fdafdaef796816a9ed0fd7ac812932d569d9beb
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56dfffea9fd3be0b3795a9ca6401e133a8427e0b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e7de55602c61c8ff28db075cc49c8dd6989d7e0
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <63d5a3e207bf315a32c7d16de6c89753a759f95a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <952e7a7e317f126d0a2b879fc531b716932d5ffa
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee01a309ebf598be1ff8174901ed6e91619f1749
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <007124c896e7d4614ac1f6bd4dedb975c35a2a8e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0405d4b63d082861f4eaff9d39c78ee9dc34f845; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0fdafdaef796816a9ed0fd7ac812932d569d9beb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56dfffea9fd3be0b3795a9ca6401e133a8427e0b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e7de55602c61c8ff28db075cc49c8dd6989d7e0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <63d5a3e207bf315a32c7d16de6c89753a759f95a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <952e7a7e317f126d0a2b879fc531b716932d5ffa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee01a309ebf598be1ff8174901ed6e91619f1749; version=2.6.12

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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