CVE-2020-24394 json
In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesy…
published 2020-08-19 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-17123
- cvss
- 7.1
- 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
In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesystem lacks ACL support, aka CID-22cf8419f131. This occurs because the current umask is not considered.
Patch / fix
- linux linux_kernel 5.7.8
- linux Debian 14, Debian 13, Debian 12 5.7.6-1
debian advisories DEBIAN-CVE-2020-24394
- 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-hwe Ubuntu 18.04 LTS 5.3.0-65.59
ubuntu advisories UBUNTU-CVE-2020-24394
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 4.18.0-305.el8
- perf RHEL 8 4.18.0-305.el8
- bpftool RHEL 8 4.18.0-305.el8
- kernel-core RHEL 8 4.18.0-305.el8
- kernel-tools RHEL 8 4.18.0-305.el8
- python3-perf RHEL 8 4.18.0-305.el8
- kernel-modules RHEL 8 4.18.0-305.el8
- kernel-zfcpdump RHEL 8 4.18.0-305.el8
red hat advisories RHSA-2021:1578RHSA-2021:1739RHSA-2021:0878RHSA-2020:5441RHSA-2020:5437RHSA-2021:0526
- kernel-rt Real Time Module 15 SP1 4.12.14-14.31.1
- kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.31.1
- kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.31.1
- kernel-source-rt Real Time Module 15 SP1 4.12.14-14.31.1
- kernel-syms SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.60.1
- kernel-source SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.60.1
- kernel-default SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLE Live Patching 12 SP4 +3 more 4.12.14-95.60.1
- kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.58.1
suse advisories SUSE-SU-2020:3210-1SUSE-SU-2020:3204-1SUSE-SU-2020:3190-1SUSE-SU-2020:3187-1SUSE-SU-2020:3180-1SUSE-SU-2020:2631-1
- kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.63.1
- kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.63.1
opensuse advisories openSUSE-SU-2020:1325-1
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-2020-24394 updated cvss 7.1
kernel: umask not applied on filesystem without ACL support
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 moreaffected: workaround, no fix planned “Out of support scope”
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Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise MRG 2 kernelaffected: workaround, no fix planned “Will not fix”
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Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-305.el8, kernel-debuginfo-common-aarch64 4.18.0-305.el8, kernel-debuginfo-common-ppc64le 4.18.0-305.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-305.el8, kernel 4.18.0-305.el8, bpftool 4.18.0-305.el8, kernel-core 4.18.0-305.el8, kernel-tools 4.18.0-305.el8, python3-perf 4.18.0-305.el8, +15 morefixed: vendor fix RHSA-2021:1578
-
Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7fixed: vendor fix RHSA-2020:5437
-
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) perf 3.10.0-957.70.1.el7, kernel 3.10.0-957.70.1.el7, bpftool 3.10.0-957.70.1.el7, python-perf 3.10.0-957.70.1.el7, kernel-tools 3.10.0-957.70.1.el7, kernel-tools-libs 3.10.0-957.70.1.el7, +2 morefixed: vendor fix RHSA-2021:0878
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Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) perf 3.10.0-1062.45.1.el7, kernel 3.10.0-1062.45.1.el7, bpftool 3.10.0-1062.45.1.el7, python-perf 3.10.0-1062.45.1.el7, kernel-tools 3.10.0-1062.45.1.el7, kernel-tools-libs 3.10.0-1062.45.1.el7, +2 morefixed: vendor fix RHSA-2021:0526
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Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7fixed: vendor fix RHSA-2020:5437
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.70.1.el7fixed: vendor fix RHSA-2021:0878
show 15 moreshow fewer
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.45.1.el7fixed: vendor fix RHSA-2021:0526
-
Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debug-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7fixed: vendor fix RHSA-2020:5441
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Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-305.rt7.72.el8, kernel-rt-core 4.18.0-305.rt7.72.el8, kernel-rt-modules 4.18.0-305.rt7.72.el8, kernel-rt-debug-core 4.18.0-305.rt7.72.el8, kernel-rt-debug-modules 4.18.0-305.rt7.72.el8, kernel-rt-modules-extra 4.18.0-305.rt7.72.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-305.rt7.72.el8, kernel-rt-kvm 4.18.0-305.rt7.72.el8, kernel-rt-core 4.18.0-305.rt7.72.el8, kernel-rt-modules 4.18.0-305.rt7.72.el8, kernel-rt-debug-kvm 4.18.0-305.rt7.72.el8, kernel-rt-debug-core 4.18.0-305.rt7.72.el8, +4 morefixed: vendor fix RHSA-2021:1739
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Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-kdump 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, +7 morefixed: vendor fix RHSA-2020:5437
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Red Hat Enterprise Linux Server AUS (v. 7.4) perf 3.10.0-693.82.1.el7, kernel 3.10.0-693.82.1.el7, python-perf 3.10.0-693.82.1.el7, kernel-tools 3.10.0-693.82.1.el7, kernel-tools-libs 3.10.0-693.82.1.el7, kernel-abi-whitelists 3.10.0-693.82.1.el7, +1 more Red Hat Enterprise Linux Server E4S (v. 7.4) perf 3.10.0-693.82.1.el7, kernel 3.10.0-693.82.1.el7, python-perf 3.10.0-693.82.1.el7, kernel-tools 3.10.0-693.82.1.el7, kernel-tools-libs 3.10.0-693.82.1.el7, kernel-bootwrapper 3.10.0-693.82.1.el7, +3 morefixed: vendor fix RHSA-2021:0760
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Red Hat Enterprise Linux Server EUS (v. 7.6) perf 3.10.0-957.70.1.el7, kernel 3.10.0-957.70.1.el7, bpftool 3.10.0-957.70.1.el7, python-perf 3.10.0-957.70.1.el7, kernel-kdump 3.10.0-957.70.1.el7, kernel-tools 3.10.0-957.70.1.el7, +7 morefixed: vendor fix RHSA-2021:0878
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Red Hat Enterprise Linux Server EUS (v. 7.7) perf 3.10.0-1062.45.1.el7, kernel 3.10.0-1062.45.1.el7, bpftool 3.10.0-1062.45.1.el7, python-perf 3.10.0-1062.45.1.el7, kernel-kdump 3.10.0-1062.45.1.el7, kernel-tools 3.10.0-1062.45.1.el7, +7 morefixed: vendor fix RHSA-2021:0526
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Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.11.1.el7fixed: vendor fix RHSA-2020:5437
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Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.82.1.el7 Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.82.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-693.82.1.el7fixed: vendor fix RHSA-2021:0760
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Red Hat Enterprise Linux Server Optional EUS (v. 7.6) kernel-debuginfo-common-ppc64 3.10.0-957.70.1.el7, kernel-debuginfo-common-x86_64 3.10.0-957.70.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.70.1.el7fixed: vendor fix RHSA-2021:0878
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Red Hat Enterprise Linux Server Optional EUS (v. 7.7) kernel-debuginfo-common-ppc64 3.10.0-1062.45.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1062.45.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.45.1.el7fixed: vendor fix RHSA-2021:0526
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Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.82.1.el7 Red Hat Enterprise Linux Server TUS (v. 7.4) perf 3.10.0-693.82.1.el7, kernel 3.10.0-693.82.1.el7, python-perf 3.10.0-693.82.1.el7, kernel-tools 3.10.0-693.82.1.el7, kernel-tools-libs 3.10.0-693.82.1.el7, kernel-abi-whitelists 3.10.0-693.82.1.el7, +1 morefixed: vendor fix RHSA-2021:0760
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Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7fixed: vendor fix RHSA-2020:5437
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Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS perf 3.10.0-957.70.1.el7, python-perf 3.10.0-957.70.1.el7fixed: vendor fix RHSA-2021:0878
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Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) kernel-headers 3.10.0-1062.45.1.el7 Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-headers 3.10.0-693.82.1.el7 Red Hat Enterprise Linux Server E4S (v. 7.4) kernel-headers 3.10.0-693.82.1.el7 Red Hat Enterprise Linux Server EUS (v. 7.7) kernel-headers 3.10.0-1062.45.1.el7 Red Hat Enterprise Linux Server TUS (v. 7.4) kernel-headers 3.10.0-693.82.1.el7not 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).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 3.6 | AV:L/AC:L/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-732 Incorrect Permission Assignment for Critical Resource
- Technology feeds
References
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22cf8419f1319ff87ec759d0ebdff4cbafaee832
patch, vendor-advisory
-
oracle.com
/security-alerts/cpuApr2021.html
patch, third-party-advisory
-
usn.ubuntu.com
/4465-1/
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-09/msg00007.html
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4483-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4485-1/
vendor-advisory, third-party-advisory
-
cdn.kernel.org
/pub/linux/kernel/v5.x/ChangeLog-5.7.8
release-notes, vendor-advisory
-
bugs.debian.org
/cgi-bin/bugreport.cgi?bug=962254
issue-tracking, third-party-advisory
-
security.netapp.com
/advisory/ntap-20200904-0003/
third-party-advisory
-
starwindsoftware.com
/security/sw-20210325-0004/
third-party-advisory
Sources
- CVE List CVE-2020-24394
- NVD CVE-2020-24394
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.