CVE-2017-18202

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-02-27 · updated 2026-06-17
Weakness: CWE-416

Description

The __oom_reap_task_mm function in mm/oom_kill.c in the Linux kernel before 4.14.4 mishandles gather operations, which allows attackers to cause a denial of service (TLB entry leak or use-after-free) or possibly have unspecified other impact by triggering a copy_to_user call within a certain time window.

Affected products

Linux kernel: from 4.6 before 4.9.68; from 4.10 before 4.14.4 — fixed in 4.14.4, 4.9.68

How to fix

Upgrade to a fixed version: Linux kernel 4.14.4, 4.9.68. Check the vendor advisory for mitigations.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=687cb0884a714ff484d038e9190edc874edcf146
http://www.securityfocus.com/bid/103161
https://access.redhat.com/errata/RHSA-2018:2772
https://github.com/torvalds/linux/commit/687cb0884a714ff484d038e9190edc874edcf146
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.4
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=687cb0884a714ff484d038e9190edc874edcf146
http://www.securityfocus.com/bid/103161
https://access.redhat.com/errata/RHSA-2018:2772
https://github.com/torvalds/linux/commit/687cb0884a714ff484d038e9190edc874edcf146
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.4

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