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Vulnerability record · CVE-2020-35508 · published 26 March 2021

CVE-2020-35508: Linux kernel race condition vulnerability

Linux · Linux Kernel

A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process.

4.5 CVSS 3.1 Medium EPSS 0.22% · top 88.0% CWE-665 · CWE-665CWE-362 · Race condition
4.5CVSS 3.1 base score, v2 4.4
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1902724 Issue TrackingPatchThird Party Advisory
https://github.com/torvalds/linux/commit/b4e00444cab4c3f3fec876dc0cccc8cbb0d1a948 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210513-0006/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1902724 Issue TrackingPatchThird Party Advisory
https://github.com/torvalds/linux/commit/b4e00444cab4c3f3fec876dc0cccc8cbb0d1a948 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210513-0006/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-35508), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.