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HIGH

CVE-2018-18559

CVSS v3

8.1

HIGH

EPSS Score

2.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-18559 Red Hat Product Security547 products fixed

    kernel: Use-after-free due to race condition in AF_PACKET implementation

  • RHSA-2020:0174 Red Hat Product Security25 products fixed

    Red Hat Security Advisory: kernel-alt security and bug fix update

  • RHSA-2019:4159 Red Hat Product Security98 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2019:3967 Red Hat Product Security111 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2019:1190 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

  • RHSA-2019:1170 Red Hat Product Security106 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

2 more advisories

Full record on NVD

Description

In the Linux kernel through 4.19, a use-after-free can occur due to a race condition between fanout_add from setsockopt and bind on an AF_PACKET socket. This issue exists because of the 15fe076edea787807a7cdc168df832544b58eba6 incomplete fix for a race condition. The code mishandles a certain multithreaded case involving a packet_do_bind unregister action followed by a packet_notifier register action. Later, packet_release operates on only one of the two applicable linked lists. The attacker can achieve Program Counter control.

Technical details

Published
2018-10-22

Frequently asked questions

What is CVE-2018-18559?

In the Linux kernel through 4.19, a use-after-free can occur due to a race condition between fanout_add from setsockopt and bind on an AF_PACKET socket. This issue exists because of the 15fe076edea787807a7cdc168df832544b58eba6 incomplete fix for a race condition. The code mishandles a certain multithreaded case involving a packet_do_bind unregister action followed by a packet_notifier register action. Later, packet_release operates on only one of the two applicable linked lists. The attacker can achieve Program Counter control.

Is CVE-2018-18559 actively exploited?

Active exploitation of CVE-2018-18559 has not been confirmed. Its EPSS score was 2.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-18559?

CVE-2018-18559 has a CVSS v3 base score of 8.1 (HIGH severity).

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