What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-19
• Weakness: CWE-362

Description

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.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• 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

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