CVE-2018-20511

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-27 · updated 2026-06-17
Weakness: CWE-200

Description

An issue was discovered in the Linux kernel before 4.18.11. The ipddp_ioctl function in drivers/net/appletalk/ipddp.c allows local users to obtain sensitive kernel address information by leveraging CAP_NET_ADMIN to read the ipddp_route dev and next fields via an SIOCFINDIPDDPRT ioctl call.

Affected products

Debian Linux: 8.0
Linux kernel: before 4.18.11 — fixed in 4.18.11

How to fix

Upgrade to a fixed version: Linux kernel 4.18.11. Check the vendor advisory for mitigations.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9824dfae5741275473a23a7ed5756c7b6efacc9d
http://www.securityfocus.com/bid/106347
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.11
https://github.com/torvalds/linux/commit/9824dfae5741275473a23a7ed5756c7b6efacc9d
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
https://lkml.org/lkml/2018/9/27/480
https://usn.ubuntu.com/4094-1/
https://usn.ubuntu.com/4118-1/
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9824dfae5741275473a23a7ed5756c7b6efacc9d
http://www.securityfocus.com/bid/106347
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.11

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