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Fencer Vulns
medium 6.7

CVE-2021-3411 json

A flaw was found in the Linux kernel in versions prior to 5.10.

published 2021-03-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26739

cvss
6.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

A flaw was found in the Linux kernel in versions prior to 5.10. A violation of memory access was found while detecting a padding of int3 in the linking state. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Patch / fix

  • linux linux_kernel 5.10
  • linux Debian 14, Debian 13, Debian 12 5.9.15-1

debian advisories DEBIAN-CVE-2021-3411

  • linux-hwe-5.8 Ubuntu 20.04 LTS 5.8.0-44.50~20.04.1
  • linux-oem-5.6 Ubuntu 20.04 LTS 5.6.0-1053.57
  • linux-riscv-5.8 Ubuntu 20.04 LTS 5.8.0-17.19~20.04.1

ubuntu advisories UBUNTU-CVE-2021-3411

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3411 updated cvss 6.7

kernel: broken KRETPROBES reports corruption of .text section while running a FTRACE stress tester

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise MRG 2 kernel
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 kernel, bpftool, kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, +1 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.pi3.com.pl http://blog.pi3.com.pl/?p=831 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1928236 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a Linux kernel

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.