CVE-2017-12762

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-08-09 · updated 2026-06-17
Weakness: CWE-119

Description

In /drivers/isdn/i4l/isdn_net.c: A user-controlled buffer is copied into a local buffer of constant size using strcpy without a length check which can cause a buffer overflow. This affects the Linux kernel 4.9-stable tree, 4.12-stable tree, 3.18-stable tree, and 4.4-stable tree.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04
Linux kernel: from 3.18 before 3.18.64; from 3.19 through 4.4.80; from 4.5 through 4.9.41; from 4.10 through 4.12.5 — fixed in 3.18.64

How to fix

Upgrade to a fixed version: Linux kernel 3.18.64. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2020/02/11/1
http://www.openwall.com/lists/oss-security/2020/02/11/2
http://www.openwall.com/lists/oss-security/2020/02/14/4
http://www.securityfocus.com/bid/100251
https://patchwork.kernel.org/patch/9880041/
https://usn.ubuntu.com/3620-1/
https://usn.ubuntu.com/3620-2/
http://www.openwall.com/lists/oss-security/2020/02/11/1
http://www.openwall.com/lists/oss-security/2020/02/11/2
http://www.openwall.com/lists/oss-security/2020/02/14/4
http://www.securityfocus.com/bid/100251
https://patchwork.kernel.org/patch/9880041/

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