CVE-2026-98287

Packet-buffer corruption via unchecked PPPoATM header writes

Published Oct 6, 2026 · Updated Oct 6, 2026

Packet-buffer errors in Linux PPPoATM allow attackers to trigger unsafe header writes and reads through bridged PPP channels. The pppoatm_send() LLC path checks headroom without making a shared skb header writable, and it inspects skb->data[0] without first ensuring a byte is present and linear. Exposure requires a PPPoATM channel bridged to another PPP channel; the upstream patch establishes unsafe buffer access but does not document a crash, disclosure, 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

Packet-buffer errors in Linux PPPoATM allow attackers to trigger unsafe header writes and reads through bridged PPP channels. The pppoatm_send() LLC path checks headroom without making a shared skb header writable, and it inspects skb->data[0] without first ensuring a byte is present and linear. Exposure requires a PPPoATM channel bridged to another PPP channel; the upstream patch establishes unsafe buffer access but does not document a crash, disclosure, or code execution.

The record

CVE
CVE-2026-98287
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=4cf476ced45d7f12df30a68e833b263e7a2202d1 <208ccc4d08b1897451e9ba01c016bf93ff107966
  2. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <30992fe39e65589ed8e000425e088fa74994b811
  3. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <8e66c5969acd859ba72fb0a7fa895623fc1b3769
  4. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e2f5529b0016db7d34f411408607f5cf395a542e
  5. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e6cd1bba7d113c15c00ac63671213a096fe4d686
  6. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ecc7253683a3c55caa868ce0ee530fcb0044bd3c
  7. Affected versionversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ffc448eb54f5ba80d4212c1e870cdb92b0f709fa
  8. Affected versionversion=5.11

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4cf476ced45d7f12df30a68e833b263e7a2202d1 <208ccc4d08b1897451e9ba01c016bf93ff107966; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <30992fe39e65589ed8e000425e088fa74994b811; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <8e66c5969acd859ba72fb0a7fa895623fc1b3769; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e2f5529b0016db7d34f411408607f5cf395a542e; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e6cd1bba7d113c15c00ac63671213a096fe4d686; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ecc7253683a3c55caa868ce0ee530fcb0044bd3c; version=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ffc448eb54f5ba80d4212c1e870cdb92b0f709fa; version=5.11

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

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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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