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MEDIUM

CVE-2020-12826

CVSS v3

5.3

MEDIUM

EPSS Score

0.7 %

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.

Packages

  • kernel-tools-libs-develAlmaLinux:8all versions · fixed in 4.18.0-240.el8

Vendor advisories

  • CVE-2020-12826 Red Hat Product Security354 products fixed · 43 known affected

    kernel: possible to send arbitrary signals to a privileged (suidroot) parent process

    kernel.src as a component of Red Hat Enterprise Linux 5 · kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6

  • RHSA-2020:4609 Red Hat Product Security30 products fixed

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

  • RHSA-2020:4431 Red Hat Product Security120 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2020:4060 Red Hat Product Security174 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2020:4062 Red Hat Product Security30 products fixed

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

Full record on NVD

Description

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

Technical details

Published
2020-05-12

Frequently asked questions

What is CVE-2020-12826?

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

Is CVE-2020-12826 actively exploited?

Active exploitation of CVE-2020-12826 has not been confirmed. Its EPSS score was 0.7% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-12826?

CVE-2020-12826 has a CVSS v3 base score of 5.3 (MEDIUM severity).

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