Skip to content
Fencer Intel
high 7.0

CVE-2020-29369 json

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11.

published 5y ago modified 4mo ago also EUVD-2020-21742

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe.

Patch / fix

  • linux linux_kernel 5.4.54, 5.7.11
  • linux Debian 14, Debian 13, Debian 12 5.7.17-1

debian advisories DEBIAN-CVE-2020-29369

  • linux Ubuntu 20.04 LTS 5.4.0-45.49
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1022.22
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1022.22
  • linux-kvm Ubuntu 20.04 LTS 5.4.0-1021.21
  • linux-azure Ubuntu 20.04 LTS 5.4.0-1023.23
  • linux-raspi Ubuntu 20.04 LTS 5.4.0-1016.17
  • linux-riscv Ubuntu 20.04 LTS 5.4.0-31.35
  • linux-oracle Ubuntu 20.04 LTS 5.4.0-1022.22

ubuntu advisories UBUNTU-CVE-2020-29369

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

  • kernel-rt Real Time Module 15 SP2 5.3.18-19.1
  • kernel-syms-rt Real Time Module 15 SP2 5.3.18-19.1
  • kernel-rt_debug Real Time Module 15 SP2 5.3.18-19.1
  • kernel-source-rt Real Time Module 15 SP2 5.3.18-19.1
  • kernel-syms SLE Module for Development Tools 15 SP2 5.3.18-24.43.2
  • kernel-source SLE Module for Development Tools 15 SP2, SLE Module for Basesystem 15 SP2 5.3.18-24.43.2
  • kernel-default SLE Workstation Extension 15 SP2, SLE Module for Legacy 15 SP2, SLE Module for Basesystem 15 SP2 +2 more 5.3.18-24.43.2
  • kernel-preempt SLE Module for Development Tools 15 SP2, SLE Module for Basesystem 15 SP2 5.3.18-24.43.2

suse advisories SUSE-SU-2020:3843-1SUSE-SU-2020:3764-1SUSE-SU-2020:3748-1SUSE-SU-2020:3713-1

  • kernel-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
  • kernel-syms-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
  • kernel-rt_debug openSUSE Leap 15.2 5.3.18-lp152.3.5.1
  • kernel-source-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
  • kernel-default-base openSUSE Leap 15.2 5.3.18-lp152.57.1.lp152.8.17.1
  • kernel-syms openSUSE Leap 15.2 5.3.18-lp152.54.1
  • kernel-obs-qa openSUSE Leap 15.2 5.3.18-lp152.54.1
  • kernel-source openSUSE Leap 15.2 5.3.18-lp152.54.1

opensuse advisories openSUSE-SU-2021:0242-1openSUSE-SU-2020:2260-1openSUSE-SU-2020:2161-1

Is CVE-2020-29369 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2020-29369 updated cvss 0.0

kernel: race condition between expand_downwards and expand_upwards and page-table free operations from an munmap call

  • 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, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=2056 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Intel 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.