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NVD / CVE Program· CNA Linux

CVE-2022-50235: NFSD: Protect against send buffer overflow in NFSv2 READDIR

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.42% (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: Linux Linux 00b4492686e0497fdb924a9d4c8f6f99377e176c, 0e57d696f60dee6117a8ace0cac7c5761d375277, 5.15.75.
  • Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 7.8.

Low priority for now. Upgrade to Linux Linux 00b4492686e0497fdb924a9d4c8f6f99377e176c, 0e57d696f60dee6117a8ace0cac7c5761d375277, 5.15.75 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, the following vulnerability has been resolved: NFSD: Protect against send buffer overflow in NFSv2 READDIR Restore the previous limit on the @count argument to prevent a buffer overflow attack.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 15, 2025
Updated
Aug 5, 2026
EPSS
0.4% · 37th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
7.8
CNA · Linux
9.8
2.0 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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

Affected versions

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

  • linux linux kernel5.15.12 and later · before 5.15.75
  • linux linux kernel5.16.1 and later · before 5.19.17
  • linux linux kernel6.0 and later · before 6.0.3
  • linux linux kernel5.16

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.16affected
    • 9e291a6a28d32545ed2fd959a8165144d1724df1 and later · before 0e57d696f60dee6117a8ace0cac7c5761d375277affected · git
    • eabc0aab98e5218ceecd82069b0d6fdfff5ee885 and later · before dc7f225090c29a5f3b9419b1af32846a201555e7affected · git
    • 53b1119a6e5028b125f431a0116ba73510d82a72 and later · before c2a878095b5c6f04f90553a3c45872f990dab14eaffected · git
    • 53b1119a6e5028b125f431a0116ba73510d82a72 and later · before f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652daffected · git
    • 53b1119a6e5028b125f431a0116ba73510d82a72 and later · before 00b4492686e0497fdb924a9d4c8f6f99377e176caffected · git
    • 5.15.12 and later · before 5.15.75affected · semver
    • before 5.16not affected · semver
    • 5.15.75 and later · up to and including 5.15.*not affected · semver
    • 5.19.17 and later · up to and including 5.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.3-16.0.3-1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-abi-stablelistsbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debuginfobefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-develbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-docbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-modulesbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-modules-extrabefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-toolsbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-tools-debuginfobefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7
Red Hat:enterprise_linux:8::baseoskernel-tools-libsbefore 0:4.18.0-425.13.1.el8_70:4.18.0-425.13.1.el8_7

+49

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-2025-39798Sep 12, 2025 · NFS: Fix the setting of capabilities when automounting a new filesystem
    22Monitor
  • ← EarlierCVE-2022-50234Sep 15, 2025 · io_uring/af_unix: defer registered files gc to io_uring release
    31Monitor
  • Later →CVE-2022-50236Sep 15, 2025 · iommu/mediatek: Fix crash on isr after kexec()
    22Monitor

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
Linux Linux00b4492686e0497fdb924a9d4c8f6f99377e176cVendor (CNA)
Linux Linux0e57d696f60dee6117a8ace0cac7c5761d375277Vendor (CNA)
Linux Linux5.15.75Vendor (CNA)
Linux Linuxc2a878095b5c6f04f90553a3c45872f990dab14eVendor (CNA)
Linux Linuxdc7f225090c29a5f3b9419b1af32846a201555e7Vendor (CNA)
Linux Linuxf59c74df82f6ac9d2ea4e01aa3ae7c6c4481652dVendor (CNA)
debian:linux6.0.3-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-425.13.1.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
suse:kernel-64kb5.14.21-150500.55.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-default4.12.14-122.275.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-default-base5.14.21-150500.55.124.1.150500.6.59.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-docs5.14.21-150500.55.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_311-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build5.14.21-150500.55.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-rt5.3.18-150300.223.1 · SUSE:Linux Enterprise Micro 5.1Package registry (OSV)
suse:kernel-source4.12.14-122.275.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-source-rt5.3.18-150300.223.1 · SUSE:Linux Enterprise Micro 5.1Package registry (OSV)
suse:kernel-syms4.12.14-122.275.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-zfcpdump5.14.21-150500.55.124.1 · SUSE:Linux Enterprise Server 15 SP5-LTSSPackage registry (OSV)

+1

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.

No commit or PR link among the references.

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).

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
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records