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NVD / CVE Program· CNA mitre

CVE-2020-24394: 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 filesys

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.36% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:12) 5.7.6-1; kernel-debug (openSUSE:Leap 15.1) 4.12.14-lp151.28.63.1.
  • Mentioned 4 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:12) 5.7.6-1; kernel-debug (openSUSE:Leap 15.1) 4.12.14-lp151.28.63.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Aug 19, 2020
Updated
Jun 16, 2026
EPSS
0.3% · 30th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
canonicalubuntu linux
opensuseleap
oraclesd-wan edge
starwindsoftwarestarwind virtual san

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • linux linux kernelbefore 5.7.8
  • opensuse leap15.1
  • oracle sd-wan edge8.2
  • starwindsoftware starwind virtual sanv8

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-305.el84.18.0-305.el8
Debian:12linuxbefore 5.7.6-15.7.6-1
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
Red Hat:enterprise_linux:7::clientbpftoolbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientbpftool-debuginfobefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernelbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-abi-whitelistsbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-debugbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-debug-debuginfobefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-debug-develbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-debuginfobefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-debuginfo-common-x86_64before 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-develbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-docbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-toolsbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7
Red Hat:enterprise_linux:7::clientkernel-tools-debuginfobefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-15852Jul 20, 2020 · An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests.
    31Monitor
  • ← EarlierCVE-2020-16166Jul 30, 2020 · The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal st
    16Monitor
  • Later →CVE-2020-14356Aug 19, 2020 · A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:kernel-tools-libs-devel4.18.0-305.el8 · AlmaLinux:8Package registry (OSV)
debian:linux5.7.6-1 · Debian:12Package registry (OSV)
opensuse:kernel-debug4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-default4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-docs4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-kvmsmall4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-obs-build4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-obs-qa4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-source4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-syms4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-vanilla4.12.14-lp151.28.63.1 · openSUSE:Leap 15.1Package registry (OSV)
red hat:bpftool0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bpftool-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-abi-whitelists0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug-devel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-devel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-doc0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-tools0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:kernel-azure4.12.14-16.25.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-default4.12.14-122.37.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.37.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-livepatch-SLE15-SP1_Update_151-3.3.2 · SUSE:Linux Enterprise Live Patching 15 SP1Package registry (OSV)
suse:kernel-obs-build4.12.14-122.37.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-rt4.12.14-10.16.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.37.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)

+5

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-732 · Incorrect Permission Assignment for Critical Resource

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records