CVE-2018-5703

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-01-16 · updated 2026-06-17
Weakness: CWE-787

Description

The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel through 4.14.11 allows attackers to cause a denial of service (slab out-of-bounds write) or possibly have unspecified other impact via vectors involving TLS.

Affected products

Linux kernel: from 4.13 before 4.14.86; from 4.15 before 4.15.8 — fixed in 4.14.86, 4.15.8

How to fix

Upgrade to a fixed version: Linux kernel 4.14.86, 4.15.8. Check the vendor advisory for mitigations.

References

https://groups.google.com/d/msg/syzkaller-bugs/0PBeVnSzfqQ/5eXAlM46BQAJ
https://groups.google.com/d/msg/syzkaller-bugs/0PBeVnSzfqQ/5eXAlM46BQAJ

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