CVE-2025-38004

Kernel memory disclosure via CAN BCM race

Published Jun 8, 2025 · Updated Aug 5, 2026

Out-of-bounds read in Linux kernel CAN BCM allows local users to disclose kernel heap memory through concurrent frame-sequence updates. In bcm_can_tx(), unsynchronized user-context sequence reductions reset currframe while the hrtimer reads frames and count, indexing beyond the slab allocation. Any unprivileged local user can race concurrent CAN_BCM sendmsg calls; successful exploitation discloses adjacent kernel heap bytes and can starve or panic the system.

CVSS severity7.1
High
EPSS probability0.24%
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 Linux kernel CAN BCM allows local users to disclose kernel heap memory through concurrent frame-sequence updates. In bcm_can_tx(), unsynchronized user-context sequence reductions reset currframe while the hrtimer reads frames and count, indexing beyond the slab allocation. Any unprivileged local user can race concurrent CAN_BCM sendmsg calls; successful exploitation discloses adjacent kernel heap bytes and can starve or panic the system.

The record

CVE
CVE-2025-38004
Published
Jun 8, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, CAPEC-540, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 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=2.6.25
  2. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <2a437b86ac5a9893c902f30ef66815bf13587bf6
  3. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <7595de7bc56e0e52b74e56c90f7e247bf626d628
  4. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <76c84c3728178b2d38d5604e399dfe8b0752645e
  5. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <8f1c022541bf5a923c8d6fa483112c15250f30a4
  6. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7
  7. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <c4e8a172501e677ebd8ea9d9161d97dc4df56fbd
  8. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <cc55dd28c20a6611e30596019b3b2f636819a4c0
  9. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <fbd8fdc2b218e979cfe422b139b8f74c12419d1f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <2a437b86ac5a9893c902f30ef66815bf13587bf6; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <7595de7bc56e0e52b74e56c90f7e247bf626d628; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <76c84c3728178b2d38d5604e399dfe8b0752645e; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <8f1c022541bf5a923c8d6fa483112c15250f30a4; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <c4e8a172501e677ebd8ea9d9161d97dc4df56fbd; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <cc55dd28c20a6611e30596019b3b2f636819a4c0; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <fbd8fdc2b218e979cfe422b139b8f74c12419d1f

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1National Vulnerability DatabaseCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1499Endpoint Denial of Service

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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