CVE-2026-68143

Kernel memory corruption via SLIP buffer race

Published Aug 10, 2026 · Updated Aug 10, 2026

An out-of-bounds write in the Linux kernel SLIP driver allows local users to corrupt kernel memory by racing an MTU change with receive processing. slip_receive_buf() reads rbuff and buffsize without the lock held by sl_realloc_bufs(), permitting writes past a shrunken buffer or into freed storage. Exploitation requires CAP_NET_ADMIN in the interface network namespace and an active SLIP link; the resulting corruption crashes the kernel or enables local privilege escalation.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Linux kernel SLIP driver allows local users to corrupt kernel memory by racing an MTU change with receive processing. slip_receive_buf() reads rbuff and buffsize without the lock held by sl_realloc_bufs(), permitting writes past a shrunken buffer or into freed storage. Exploitation requires CAP_NET_ADMIN in the interface network namespace and an active SLIP link; the resulting corruption crashes the kernel or enables local privilege escalation.

The record

CVE
CVE-2026-68143
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0e37bbd6d617eb52bace49390e99eaedc1af73ce
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44401f7dd9940ced7098930ef64f5a332f279fc2
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d07b178bef511d69558cfc89fe1129258dc39f8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eb3836eab47487823f362e6985e170a1e15f20fd
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee7f9bb9320add61f7b367d7e6cd55e3a3a4d65d
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0e37bbd6d617eb52bace49390e99eaedc1af73ce; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44401f7dd9940ced7098930ef64f5a332f279fc2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d07b178bef511d69558cfc89fe1129258dc39f8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eb3836eab47487823f362e6985e170a1e15f20fd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee7f9bb9320add61f7b367d7e6cd55e3a3a4d65d; version=2.6.12

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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