CVE-2026-98300

Kernel warning via IPv6 listener-close race

Published Oct 6, 2026 · Updated Oct 6, 2026

Race condition in the Linux kernel's IPv6 TCP receive path allows context-dependent attackers to trigger a socket-accounting warning. In tcp_v6_do_rcv(), a listener closed between tcp_v6_rcv() and packet processing enters TCP_CLOSE, yet the receive path still calls skb_clone_and_charge_r() without locking its socket accounting. The race requires an IPv6 listener to close while a packet is in flight; the published trace establishes a kernel warning, not a crash or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel's IPv6 TCP receive path allows context-dependent attackers to trigger a socket-accounting warning. In tcp_v6_do_rcv(), a listener closed between tcp_v6_rcv() and packet processing enters TCP_CLOSE, yet the receive path still calls skb_clone_and_charge_r() without locking its socket accounting. The race requires an IPv6 listener to close while a packet is in flight; the published trace establishes a kernel warning, not a crash or code execution.

The record

CVE
CVE-2026-98300
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=4.4
  2. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <1cb7f292a337fdc72a8219bcd9d40a9cf5e86db5
  3. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <3e3394a13b603cc79b6a35480b8e20df6c716944
  4. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <56d38839ef0bff6526d9bd73b6811bd00316b21c
  5. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <619bfbaacbff6a9822923f69f6af29d7f66a870c
  6. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <7d94602e77a4525611afebb23149145ac242afd7
  7. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <8e759cd1f6444a946bd1fd2b2b29eea582eea1d5
  8. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <a23a3bc5004df6434de05797e0b6b2ecf864b86a
  9. Affected versionversion=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <b727e3d58cb906f1506c1334dfba71fbb1338339

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <1cb7f292a337fdc72a8219bcd9d40a9cf5e86db5; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <3e3394a13b603cc79b6a35480b8e20df6c716944; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <56d38839ef0bff6526d9bd73b6811bd00316b21c; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <619bfbaacbff6a9822923f69f6af29d7f66a870c; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <7d94602e77a4525611afebb23149145ac242afd7; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <8e759cd1f6444a946bd1fd2b2b29eea582eea1d5; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <a23a3bc5004df6434de05797e0b6b2ecf864b86a; version=e994b2f0fb9229aeff5eea9541320bd7b2ca8714 <b727e3d58cb906f1506c1334dfba71fbb1338339

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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