CVE-2026-98208

Kernel memory consumption via full-table SDIO UART probing

Published Oct 6, 2026 · Updated Oct 6, 2026

Memory leak in the Linux kernel's SDIO UART driver allows attackers to consume kernel memory via probes when all eight port slots are occupied. The sdio_uart_add_port() function allocates xmit_fifo before securing a slot in sdio_uart_table[] and returns -EBUSY without freeing that FIFO when the table is full. Repeated failures require SDIO UART device probing with a full port table; no network or unprivileged-user trigger is documented.

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

Memory leak in the Linux kernel's SDIO UART driver allows attackers to consume kernel memory via probes when all eight port slots are occupied. The sdio_uart_add_port() function allocates xmit_fifo before securing a slot in sdio_uart_table[] and returns -EBUSY without freeing that FIFO when the table is full. Repeated failures require SDIO UART device probing with a full port table; no network or unprivileged-user trigger is documented.

The record

CVE
CVE-2026-98208
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=2.6.34
  2. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <53823e25793a97d07e6e98e0904bbf74cac8bc76
  3. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <5e142adbbdc54afbd01fad476c91cded41d22594
  4. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <72f4c2b7a48423c708f2c348585419a1b71ab04c
  5. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <8a2c1bf209ba04cbd14153a771724bd5aa522fcd
  6. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <9e992d59138fcfaa4bad7cc0750265b0a8bca100
  7. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <ac866db277a4c73e84b4263773652e3aba326249
  8. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <b97b5b66c93cb4aaf6358727a73fff880a774dfd
  9. Affected versionversion=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <fd8223c53ad9553b2a349d2a40e19bbc6e60fc48

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <53823e25793a97d07e6e98e0904bbf74cac8bc76; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <5e142adbbdc54afbd01fad476c91cded41d22594; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <72f4c2b7a48423c708f2c348585419a1b71ab04c; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <8a2c1bf209ba04cbd14153a771724bd5aa522fcd; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <9e992d59138fcfaa4bad7cc0750265b0a8bca100; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <ac866db277a4c73e84b4263773652e3aba326249; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <b97b5b66c93cb4aaf6358727a73fff880a774dfd; version=8b197a5ce7a7218bb9fc721647ba0d5734f27348 <fd8223c53ad9553b2a349d2a40e19bbc6e60fc48

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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