CVE-2026-98025

Kernel heap corruption via reboot-sentinel fallthrough

Published Sep 25, 2026 · Updated Sep 25, 2026

Heap-based buffer overflow in the cx82310 Ethernet-over-USB driver in Linux allows physically proximate attackers to corrupt kernel memory. The rx_fixup path treats a 0xffff reboot sentinel as an incomplete-packet length, bypasses the MTU check, and copies up to 4094 bytes into a 1516-byte partial_data allocation. Exploitation requires a connected device to supply the crafted URB; a following URB also causes out-of-bounds reads and passes a spliced 64 KB frame to the network stack.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the cx82310 Ethernet-over-USB driver in Linux allows physically proximate attackers to corrupt kernel memory. The rx_fixup path treats a 0xffff reboot sentinel as an incomplete-packet length, bypasses the MTU check, and copies up to 4094 bytes into a 1516-byte partial_data allocation. Exploitation requires a connected device to supply the crafted URB; a following URB also causes out-of-bounds reads and passes a spliced 64 KB frame to the network stack.

The record

CVE
CVE-2026-98025
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19.322 <4.20
  2. Affected versionversion=5.10
  3. Affected versionversion=5.4.284 <5.5
  4. Affected versionversion=5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb
  5. Affected versionversion=c1b187a86a176e42f5e48066556980e3232b6cab
  6. Affected versionversion=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <237c9ae7145772af147e4665f158938350fa5658
  7. Affected versionversion=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287
  8. Affected versionversion=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <5d50e90add8b4a978395e893e81954d19d58a7c5
  9. Affected versionversion=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <659654654eb140851467af41d610473c100c7975

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19.322 <4.20; version=5.10; version=5.4.284 <5.5; version=5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb; version=c1b187a86a176e42f5e48066556980e3232b6cab; version=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <237c9ae7145772af147e4665f158938350fa5658; version=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287; version=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <5d50e90add8b4a978395e893e81954d19d58a7c5; version=ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <659654654eb140851467af41d610473c100c7975

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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

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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