CVE-2020-10751

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-26 · updated 2026-06-17
Weakness: CWE-349

Description

A flaw was found in the Linux kernels SELinux LSM hook implementation before version 5.7, where it incorrectly assumed that an skb would only contain a single netlink message. The hook would incorrectly only validate the first netlink message in the skb and allow or deny the rest of the messages within the skb with the granted permission without further processing.

Affected products

kernel Selinux: before 5.7 — fixed in 5.7
RedHat Enterprise Linux Server: 7.0, 8.0

How to fix

Upgrade to a fixed version: kernel Selinux 5.7. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
http://www.openwall.com/lists/oss-security/2020/05/27/3
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10751
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb73974172ffaaf57a7c42f35424d9aece1a5af6
https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
https://lore.kernel.org/selinux/CACT4Y+b8HiV6KFuAPysZD=5hmyO4QisgxCKi4DHU3CfMPSP=yg%40mail.gmail.com/
https://usn.ubuntu.com/4389-1/
https://usn.ubuntu.com/4390-1/
https://usn.ubuntu.com/4391-1/

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