CVE-2026-98850Hinoki check available

Kernel panic via TX_RING byte-count overflow

Published Oct 18, 2026 · Updated Oct 18, 2026

Integer overflow in Linux Kernel TX_RING allows local users to trigger a kernel BUG via concurrent packet transmission and frame reuse. In net/packet/af_packet.c, tpacket_snd() accumulates transmitted lengths in signed int len_sum without bounding the total as userspace recycles completed frames, allowing an overflowed return value to trigger a BUG in sock_sendmsg_nosec(). Exploitation requires CAP_NET_RAW, and systems configured to panic on oops suffer a host kernel panic.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in Linux Kernel TX_RING allows local users to trigger a kernel BUG via concurrent packet transmission and frame reuse. In net/packet/af_packet.c, tpacket_snd() accumulates transmitted lengths in signed int len_sum without bounding the total as userspace recycles completed frames, allowing an overflowed return value to trigger a BUG in sock_sendmsg_nosec(). Exploitation requires CAP_NET_RAW, and systems configured to panic on oops suffer a host kernel panic.

The record

CVE
CVE-2026-98850
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
Linux Foundation
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=2.6.31
  2. Affected versionversion=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <2cf81fc9505b148b1b70068303ea6ea4b1212403
  3. Affected versionversion=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <69ca64bbb528898916f309552053c32a04a36ebc
  4. Affected versionversion=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <9fd63d284e251332f4874ef9023cde472f315f86
  5. Affected versionversion=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <be12b221c0301111eeb023be04add3c6ad7c21fe

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Linux Foundation · Linux Kernelversion=2.6.31; version=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <2cf81fc9505b148b1b70068303ea6ea4b1212403; version=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <69ca64bbb528898916f309552053c32a04a36ebc; version=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <9fd63d284e251332f4874ef9023cde472f315f86; version=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <be12b221c0301111eeb023be04add3c6ad7c21fe

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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