CVE-2026-72121

System disruption via unsynchronized CAN state updates

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in the Linux CAN Broadcast Manager allows attackers to corrupt shared state and transmit stale CAN reply frames. bcm_rx_setup() updates timer, filter, and frame fields without synchronizing concurrent receive and timer handlers, while bcm_can_tx() can read a partly overwritten current frame. Reachability requires concurrent BCM setup operations and incoming CAN traffic on a CAN-equipped system; the resulting corruption can inject incorrect bus traffic or crash the kernel.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux CAN Broadcast Manager allows attackers to corrupt shared state and transmit stale CAN reply frames. bcm_rx_setup() updates timer, filter, and frame fields without synchronizing concurrent receive and timer handlers, while bcm_can_tx() can read a partly overwritten current frame. Reachability requires concurrent BCM setup operations and incoming CAN traffic on a CAN-equipped system; the resulting corruption can inject incorrect bus traffic or crash the kernel.

The record

CVE
CVE-2026-72121
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=2a437b86ac5a9893c902f30ef66815bf13587bf6
  2. Affected versionversion=5.10.238 <5.11
  3. Affected versionversion=5.15.185 <5.16
  4. Affected versionversion=5.4.294 <5.5
  5. Affected versionversion=6.1.141 <6.2
  6. Affected versionversion=6.12.31 <6.12.101
  7. Affected versionversion=6.14.9 <6.15
  8. Affected versionversion=6.15
  9. Affected versionversion=6.6.93 <6.6.148
  10. Affected versionversion=7595de7bc56e0e52b74e56c90f7e247bf626d628
  11. Affected versionversion=76c84c3728178b2d38d5604e399dfe8b0752645e <a7eb6db1cd3f7b556a301dc1265945ad112089f7
  12. Affected versionversion=8f1c022541bf5a923c8d6fa483112c15250f30a4
  13. Affected versionversion=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <19b1994069dd29478ba767de1f98f14a088198dc
  14. Affected versionversion=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <749179c2e25b95d22499ed29096b3e02d6dfd2b4
  15. Affected versionversion=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <fc9f5ee1b073bd233d9c604e338af4ebb42cbc33
  16. Affected versionversion=c4e8a172501e677ebd8ea9d9161d97dc4df56fbd
  17. Affected versionversion=cc55dd28c20a6611e30596019b3b2f636819a4c0 <834cbca3b12e46887f7a9b35f1981a888360ea4c
  18. Affected versionversion=fbd8fdc2b218e979cfe422b139b8f74c12419d1f

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2a437b86ac5a9893c902f30ef66815bf13587bf6; version=5.10.238 <5.11; version=5.15.185 <5.16; version=5.4.294 <5.5; version=6.1.141 <6.2; version=6.12.31 <6.12.101; version=6.14.9 <6.15; version=6.15; version=6.6.93 <6.6.148; version=7595de7bc56e0e52b74e56c90f7e247bf626d628; version=76c84c3728178b2d38d5604e399dfe8b0752645e <a7eb6db1cd3f7b556a301dc1265945ad112089f7; version=8f1c022541bf5a923c8d6fa483112c15250f30a4; version=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <19b1994069dd29478ba767de1f98f14a088198dc; version=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <749179c2e25b95d22499ed29096b3e02d6dfd2b4; version=c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 <fc9f5ee1b073bd233d9c604e338af4ebb42cbc33; version=c4e8a172501e677ebd8ea9d9161d97dc4df56fbd; version=cc55dd28c20a6611e30596019b3b2f636819a4c0 <834cbca3b12e46887f7a9b35f1981a888360ea4c; version=fbd8fdc2b218e979cfe422b139b8f74c12419d1f

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.8Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499.004Application or System Exploitation for Endpoint 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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