CVE-2026-22997Network attack vectorHinoki check available

Remote netdevice teardown hang via refcount leak

Published Jan 25, 2026 · Updated Jan 25, 2026

Denial of service in Linux Kernel allows remote attackers to hang CAN netdevice teardown via duplicate J1939 RTS/BAM frames. j1939_xtp_rx_rts_session_active() cancels an active receiver timer without deactivating the session, leaking its reference count. A bound J1939 socket and CAN-network access are required; leaked references pin the netdevice and can indefinitely block device or namespace teardown.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Linux Kernel allows remote attackers to hang CAN netdevice teardown via duplicate J1939 RTS/BAM frames. j1939_xtp_rx_rts_session_active() cancels an active receiver timer without deactivating the session, leaking its reference count. A bound J1939 socket and CAN-network access are required; leaked references pin the netdevice and can indefinitely block device or namespace teardown.

The record

CVE
CVE-2026-22997
Published
Jan 25, 2026
Updated
Jan 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 25, 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=5.4
  2. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <1809c82aa073a11b7d335ae932d81ce51a588a4a
  3. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <6121b7564c725b632ffe4764abe85aa239d37703
  4. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <cb2a610867bc379988bae0bb4b8bbc59c0decf1a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.4; version=9d71dd0c70099914fcd063135da3c580865e924c <1809c82aa073a11b7d335ae932d81ce51a588a4a; version=9d71dd0c70099914fcd063135da3c580865e924c <6121b7564c725b632ffe4764abe85aa239d37703; version=9d71dd0c70099914fcd063135da3c580865e924c <cb2a610867bc379988bae0bb4b8bbc59c0decf1a

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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.

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)
Vectornetwork
Privilegesunauthenticated
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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