CVE-2020-29368 json
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5.
published 2020-11-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21741
- cvss
- 7.0
- 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 30%
- public exploits
- 0
- none known
Summary
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
Patch / fix
- linux linux_kernel 4.9.228, 4.14.185, 4.19.129, 5.4.48, 5.7.5
- linux Debian 14, Debian 13, Debian 12 5.7.6-1
debian advisories DEBIAN-CVE-2020-29368
- linux Ubuntu 18.04 LTS 4.15.0-115.116
- linux Ubuntu 20.04 LTS 5.4.0-45.49
- linux-aws Ubuntu 18.04 LTS 4.15.0-1080.84
- linux-aws Ubuntu 20.04 LTS 5.4.0-1022.22
- linux-gcp Ubuntu 16.04 LTS 4.15.0-1081.92~16.04.1
- linux-gcp Ubuntu 20.04 LTS 5.4.0-1022.22
- linux-hwe Ubuntu 16.04 LTS 4.15.0-115.116~16.04.1
- linux-kvm Ubuntu 18.04 LTS 4.15.0-1072.73
ubuntu advisories UBUNTU-CVE-2020-29368
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 RHEL 8 4.18.0-348.el8
- perf RHEL 8 4.18.0-348.el8
- bpftool RHEL 8 4.18.0-348.el8
- kernel-core RHEL 8 4.18.0-348.el8
- kernel-tools RHEL 8 4.18.0-348.el8
- python3-perf RHEL 8 4.18.0-348.el8
- kernel-modules RHEL 8 4.18.0-348.el8
- kernel-zfcpdump RHEL 8 4.18.0-348.el8
red hat advisories RHSA-2021:4356RHSA-2022:5220RHSA-2022:5224RHSA-2022:5626RHSA-2022:5633RHSA-2021:4140
- kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.66.2
- kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.66.2
- kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.66.2
- kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.66.2
- kernel-rt SLE Real Time 12 SP5 4.12.14-10.37.1
- kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.37.1
- kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.37.1
- kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.37.1
suse advisories SUSE-SU-2021:1210-1SUSE-SU-2021:1176-1SUSE-SU-2021:1175-1SUSE-SU-2021:1046-1SUSE-SU-2021:0869-1SUSE-SU-2021:0868-1
- kernel-syms openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-obs-qa openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-source openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-default openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-preempt openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-kvmsmall openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-obs-build openSUSE Leap 15.2 5.3.18-lp152.66.2
- kernel-default-base openSUSE Leap 15.2 5.3.18-lp152.66.2.lp152.8.23.2
opensuse advisories openSUSE-SU-2021:0393-1
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-2020-29368 updated cvss 7.0
kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check
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Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-348.el8, kernel-debuginfo-common-aarch64 4.18.0-348.el8, kernel-debuginfo-common-ppc64le 4.18.0-348.el8fixed: vendor fix RHSA-2021:4356
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Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-debuginfo-common-x86_64 4.18.0-193.87.1.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.87.1.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.87.1.el8_2fixed: vendor fix RHSA-2022:5220
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Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-348.el8, kernel 4.18.0-348.el8, bpftool 4.18.0-348.el8, kernel-core 4.18.0-348.el8, kernel-tools 4.18.0-348.el8, python3-perf 4.18.0-348.el8, +15 morefixed: vendor fix RHSA-2021:4356
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Red Hat Enterprise Linux BaseOS EUS (v. 8.2) perf 4.18.0-193.87.1.el8_2, kernel 4.18.0-193.87.1.el8_2, bpftool 4.18.0-193.87.1.el8_2, kernel-core 4.18.0-193.87.1.el8_2, kernel-tools 4.18.0-193.87.1.el8_2, python3-perf 4.18.0-193.87.1.el8_2, +15 morefixed: vendor fix RHSA-2022:5220
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Red Hat Enterprise Linux BaseOS EUS (v.8.4) perf 4.18.0-305.57.1.el8_4, kernel 4.18.0-305.57.1.el8_4, bpftool 4.18.0-305.57.1.el8_4, kernel-core 4.18.0-305.57.1.el8_4, kernel-tools 4.18.0-305.57.1.el8_4, python3-perf 4.18.0-305.57.1.el8_4, +15 more Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-debuginfo-common-x86_64 4.18.0-305.57.1.el8_4, kernel-debuginfo-common-aarch64 4.18.0-305.57.1.el8_4, kernel-debuginfo-common-ppc64le 4.18.0-305.57.1.el8_4fixed: vendor fix RHSA-2022:5626
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Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-kvm 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-core 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-modules 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-kvm 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-core 4.18.0-305.57.1.rt7.129.el8_4, +4 morefixed: vendor fix RHSA-2022:5633
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Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, kernel-rt-debug-modules 4.18.0-348.rt7.130.el8, kernel-rt-modules-extra 4.18.0-348.rt7.130.el8, +2 morefixed: vendor fix RHSA-2021:4140
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Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-core 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-modules 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-core 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-modules 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-modules-extra 4.18.0-193.87.1.rt13.137.el8_2, +2 morefixed: vendor fix RHSA-2022:5224
show 4 moreshow fewer
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Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-kvm 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-kvm 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, +4 morefixed: vendor fix RHSA-2021:4140
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Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-kvm 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-core 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-modules 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-kvm 4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-core 4.18.0-193.87.1.rt13.137.el8_2, +4 morefixed: vendor fix RHSA-2022:5224
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Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-core 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-modules 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-core 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-modules 4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-modules-extra 4.18.0-305.57.1.rt7.129.el8_4, +2 morefixed: vendor fix RHSA-2022:5633
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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, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 morenot 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
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=2045 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
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
patch, vendor-advisory
-
bugs.chromium.org
/p/project-zero/issues/detail?id=2045
exploit, issue-tracking, patch, third-party-advisory
-
cdn.kernel.org
/pub/linux/kernel/v5.x/ChangeLog-5.7.5
release-notes, vendor-advisory
-
security.netapp.com
/advisory/ntap-20210108-0002/
third-party-advisory
Sources
- CVE List CVE-2020-29368
- NVD CVE-2020-29368
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.