What is CVE-2021-29650?

CVE-2021-29650 is a medium-severity vulnerability in Linux Kernel. CVSS score: 5.5/10. Published 2021-03-30.

How severe is CVE-2021-29650?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-29650 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Linux Kernel

CVE-2021-29650

An issue was discovered in the Linux kernel before 5.11.11. The netfilter subsystem allows attackers to cause a denial of service (panic) because net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h lack a full memory barrier upon the assignment of a new table value, aka CID-175e476b8cdf.

Published 2021-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000

Affected products

Linux Kernel
Debian Linux — versions 9.0
Fedoraproject Fedora — versions 32, 33, 34

Public proof-of-concept exploits

References

cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.11 (Patch, Mailing List, Vendor Advisory)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.debian.org/debian-lts-announce/2021/06/msg00020.html (mailing-list, Third Party Advisory)
lists.debian.org/debian-lts-announce/2021/06/msg00019.html (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29650?: CVE-2021-29650 is a medium-severity vulnerability in Linux Kernel. CVSS score: 5.5/10. Published 2021-03-30.
How severe is CVE-2021-29650?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-29650 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.