CVE-2026-72122

Interface-scope bypass via torn socket binding reads

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in Linux kernel CAN BCM since 2.6.25 allows local users to bypass interface scoping or disrupt receive operations. In bcm_sendmsg(), bo->bound and bo->ifindex are read before lock_sock() while concurrent notification, connect, and release paths update both under the lock. A local user sharing the socket or racing CAN-device removal can produce a torn binding that matches any interface, while bcm_rx_setup() can leave a broken receive operation registered after device loss.

CVSS severity7.3
High
EPSS probability0.16%
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 Linux kernel CAN BCM since 2.6.25 allows local users to bypass interface scoping or disrupt receive operations. In bcm_sendmsg(), bo->bound and bo->ifindex are read before lock_sock() while concurrent notification, connect, and release paths update both under the lock. A local user sharing the socket or racing CAN-device removal can produce a torn binding that matches any interface, while bcm_rx_setup() can leave a broken receive operation registered after device loss.

The record

CVE
CVE-2026-72122
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367
Attack vector
local
Privileges
authenticated

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=2.6.25
  2. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <0f6f9f95294b4cbb26ba02209e893e3bd91237c3
  3. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <35f0ac19efb1a3f6c5e12c00e475a9ec2d9c3a6d
  4. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <6bcc5cd247c2934373bc2a1cdf8bf12321169543
  5. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9e60c586faeaed80d55ab8ce2a4b8e56133bc395
  6. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <b70f1a15533afeeec5d07f20bec3f3867ab1c7b6
  7. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <b9c6ac6fb4e01b34575816066e5d3890a57b3c86
  8. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <d9b091d9d22fee81ec53fb55d2032951993ceadb
  9. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <ffa80a2af27c97453861a5128e537214a31cd18a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <0f6f9f95294b4cbb26ba02209e893e3bd91237c3; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <35f0ac19efb1a3f6c5e12c00e475a9ec2d9c3a6d; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <6bcc5cd247c2934373bc2a1cdf8bf12321169543; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9e60c586faeaed80d55ab8ce2a4b8e56133bc395; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <b70f1a15533afeeec5d07f20bec3f3867ab1c7b6; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <b9c6ac6fb4e01b34575816066e5d3890a57b3c86; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <d9b091d9d22fee81ec53fb55d2032951993ceadb; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <ffa80a2af27c97453861a5128e537214a31cd18a

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.3kernel.org via CVE ProgramCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

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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