CVE-2026-98369

RCU warnings via unprotected XFRM reinjection

Published Oct 6, 2026 · Updated Oct 6, 2026

RCU lifetime errors in Linux kernel XFRM transport reinjection allow attackers to trigger kernel warnings via deferred packets. The xfrm_trans_reinject workqueue invokes finish callbacks without an RCU read lock, while xfrm_trans_queue_net can queue packets without retaining route-destination and device references. The path requires XFRM transport-mode reinjection; the upstream patch documents warnings and unsafe lifetime handling, not a demonstrated crash or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

RCU lifetime errors in Linux kernel XFRM transport reinjection allow attackers to trigger kernel warnings via deferred packets. The xfrm_trans_reinject workqueue invokes finish callbacks without an RCU read lock, while xfrm_trans_queue_net can queue packets without retaining route-destination and device references. The path requires XFRM transport-mode reinjection; the upstream patch documents warnings and unsafe lifetime handling, not a demonstrated crash or code execution.

The record

CVE
CVE-2026-98369
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=130d9e5017ade1b81d16783563edb38c12a2eab7
  2. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <0cda8273265d30cac6423834fd7d4acb75f04fdb
  3. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <6601d91a85761f33351c71e04ec0bbd294ca07ce
  4. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <664fc0941df7c1918b2cd4de6ee00469ba77d8e4
  5. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <68a317b4aec8ca1868a39d69e40f9e29baa4f40a
  6. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <6eb3b071be8e260543c604550c54dac66e6b174b
  7. Affected versionversion=4f4920669d21e1060b7243e5118dc3b71ced1276 <d2f5082f9e84653fa1a9e8aebaaff23e688f5e19
  8. Affected versionversion=5.15.75 <5.15.222
  9. Affected versionversion=5.19.17 <5.20
  10. Affected versionversion=6.0.3 <6.1
  11. Affected versionversion=6.1
  12. Affected versionversion=7d98b26684cb2390729525b341ea099f0badbe18 <41e47f1664be86c91326f0afe0504a1162d00907
  13. Affected versionversion=f520075da484306bbb8425afd2c42404ba74816f

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=130d9e5017ade1b81d16783563edb38c12a2eab7; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <0cda8273265d30cac6423834fd7d4acb75f04fdb; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <6601d91a85761f33351c71e04ec0bbd294ca07ce; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <664fc0941df7c1918b2cd4de6ee00469ba77d8e4; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <68a317b4aec8ca1868a39d69e40f9e29baa4f40a; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <6eb3b071be8e260543c604550c54dac66e6b174b; version=4f4920669d21e1060b7243e5118dc3b71ced1276 <d2f5082f9e84653fa1a9e8aebaaff23e688f5e19; version=5.15.75 <5.15.222; version=5.19.17 <5.20; version=6.0.3 <6.1; version=6.1; version=7d98b26684cb2390729525b341ea099f0badbe18 <41e47f1664be86c91326f0afe0504a1162d00907; version=f520075da484306bbb8425afd2c42404ba74816f

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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