CVE-2026-68143

In the Linux kernel, the following vulnerability has been resolved: net: slip: serialize receive against buffer reallocation sl_realloc_bufs() replaces rbuff and updates buffsize while holding sl->lock. slip_receive_buf() reads those fields and writes through rbuff without holding the lock. An MTU change can therefore race with receive processing. An MTU shrink can expose the new smaller rbuff with the old larger bound, causing an out-of-bounds write. A receive callback which already loaded the old rbuff can instead continue writing after that buffer has been freed. Serialize receive processing with sl_realloc_bufs() by holding sl->lock while consuming each receive batch.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0e37bbd6d617eb52bace49390e99eaedc1af73ce
https://git.kernel.org/stable/c/189a550eb7e1dc10018718ddfc46d003ffe58653
https://git.kernel.org/stable/c/1be09d175b627fad7f6bec7ad27b8a4a99863912
https://git.kernel.org/stable/c/44401f7dd9940ced7098930ef64f5a332f279fc2
https://git.kernel.org/stable/c/5d07b178bef511d69558cfc89fe1129258dc39f8
https://git.kernel.org/stable/c/8180daf2b66155f84ec4f9e3f95488c8a3421716
https://git.kernel.org/stable/c/eb3836eab47487823f362e6985e170a1e15f20fd
https://git.kernel.org/stable/c/ee7f9bb9320add61f7b367d7e6cd55e3a3a4d65d

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-19 17:20

NVD link : CVE-2026-68143

Mitre link : CVE-2026-68143

CVE.ORG link : CVE-2026-68143

JSON object : View

Products Affected

No product.

CWE

No CWE.

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An MTU shrink\ncan expose the new smaller rbuff with the old larger bound, causing an\nout-of-bounds write. A receive callback which already loaded the old\nrbuff can instead continue writing after that buffer has been freed.\n\nSerialize receive processing with sl_realloc_bufs() by holding sl->lock\nwhile consuming each receive batch."}], "lastModified": "2026-08-19T17:20:31.510", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}