What’s Vulnerable › Vulnerabilities

CVE-2020-16119: DCCP CCID structure use-after-free

• Severity: high (CVSS 7.8 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: 2021-01-14 · updated 2026-06-17
• Weakness: CWE-416

Description

Use-after-free vulnerability in the Linux kernel exploitable by a local attacker due to reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener after being released. Fixed in Ubuntu Linux kernel 5.4.0-51.56, 5.3.0-68.63, 4.15.0-121.123, 4.4.0-193.224, 3.13.0.182.191 and 3.2.0-149.196.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 20.04
• Debian Linux: 9.0, 11.0
• Linux kernel: all versions

References

• https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=01872cb896c76cedeabe93a08456976ab55ad695
• https://launchpad.net/bugs/1883840
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
• https://lore.kernel.org/netdev/20201013171849.236025-1-kleber.souza%40canonical.com/T/
• https://security.netapp.com/advisory/ntap-20210304-0006/
• https://ubuntu.com/USN-4576-1
• https://ubuntu.com/USN-4577-1
• https://ubuntu.com/USN-4578-1
• https://ubuntu.com/USN-4579-1
• https://ubuntu.com/USN-4580-1
• https://www.debian.org/security/2021/dsa-4978

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