High 7.8Published Aug 10, 2026

CVE-2026-68143net: slip: serialize receive against buffer reallocation

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8180daf2b66155f84ec4f9e3f95488c8a3421716; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 189a550eb7e1dc10018718ddfc46d003ffe58653; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 1be09d175b627fad7f6bec7ad27b8a4a99863912; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before eb3836eab47487823f362e6985e170a1e15f20fd; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 44401f7dd9940ced7098930ef64f5a332f279fc2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5d07b178bef511d69558cfc89fe1129258dc39f8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0e37bbd6d617eb52bace49390e99eaedc1af73ce; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ee7f9bb9320add61f7b367d7e6cd55e3a3a4d65d	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.