CVE-2026-98238

Out-of-bounds kernel read via unchecked interface index

Published Oct 6, 2026 · Updated Oct 6, 2026

Out-of-bounds read in the Linux t7xx WWAN driver allows attackers to trigger invalid kernel memory access through malformed modem metadata. The t7xx_ccmni_recv_skb() function uses a five-bit DPMAIF PIT index to read the 21-entry ccmni_inst[] array without checking its bounds, treating adjacent callback-table data as a t7xx_ccmni structure. The path requires a T700 modem delivering a malformed receive descriptor; the published test demonstrates an out-of-bounds dereference and packet queuing, not data disclosure or a confirmed crash.

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

Out-of-bounds read in the Linux t7xx WWAN driver allows attackers to trigger invalid kernel memory access through malformed modem metadata. The t7xx_ccmni_recv_skb() function uses a five-bit DPMAIF PIT index to read the 21-entry ccmni_inst[] array without checking its bounds, treating adjacent callback-table data as a t7xx_ccmni structure. The path requires a T700 modem delivering a malformed receive descriptor; the published test demonstrates an out-of-bounds dereference and packet queuing, not data disclosure or a confirmed crash.

The record

CVE
CVE-2026-98238
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=05d19bf500f8281f574713479b04679fa226d0a3 <7c2fe308bda5a7e6222d7f0c3c311991372baab4
  2. Affected versionversion=05d19bf500f8281f574713479b04679fa226d0a3 <9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad
  3. Affected versionversion=05d19bf500f8281f574713479b04679fa226d0a3 <c7ead9704249d57d4693a04697e3bbd285138fa9
  4. Affected versionversion=05d19bf500f8281f574713479b04679fa226d0a3 <d28aa2de9654e8024922775520a2665e00c04ad5
  5. Affected versionversion=05d19bf500f8281f574713479b04679fa226d0a3 <e1b0609b1a40da03e385be290853a604eb4c3fb9
  6. Affected versionversion=05d19bf500f8281f574713479b04679fa226d0a3 <fba45070e25abdae08bcaebfadeef050dc39e208
  7. Affected versionversion=5.19

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=05d19bf500f8281f574713479b04679fa226d0a3 <7c2fe308bda5a7e6222d7f0c3c311991372baab4; version=05d19bf500f8281f574713479b04679fa226d0a3 <9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad; version=05d19bf500f8281f574713479b04679fa226d0a3 <c7ead9704249d57d4693a04697e3bbd285138fa9; version=05d19bf500f8281f574713479b04679fa226d0a3 <d28aa2de9654e8024922775520a2665e00c04ad5; version=05d19bf500f8281f574713479b04679fa226d0a3 <e1b0609b1a40da03e385be290853a604eb4c3fb9; version=05d19bf500f8281f574713479b04679fa226d0a3 <fba45070e25abdae08bcaebfadeef050dc39e208; version=5.19

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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