CVE-2020-10742

Kernel panic via NFS direct-write buffer overrun

Published Jun 2, 2021 · Updated Aug 4, 2024

Out-of-bounds write in the RHEL 7 NFS client allows local users with high privileges to crash the kernel during direct I/O writes. nfs_direct_write_schedule_segment indexes past a kmalloc-allocated buffer while scheduling a direct NFS write, corrupting adjacent kernel memory. Reaching the RHEL-only 3.10 kernel path requires high local privileges and an NFS client; the corruption can expose kernel data or cause a panic.

CVSS severity6.0
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the RHEL 7 NFS client allows local users with high privileges to crash the kernel during direct I/O writes. nfs_direct_write_schedule_segment indexes past a kmalloc-allocated buffer while scheduling a direct NFS write, corrupting adjacent kernel memory. Reaching the RHEL-only 3.10 kernel path requires high local privileges and an NFS client; the corruption can expose kernel data or cause a panic.

The record

CVE
CVE-2020-10742
Published
Jun 2, 2021
Updated
Aug 4, 2024
Vendor
Red Hat
Product
Red Hat Enterprise Linux 7
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=kernel 3.10.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Red Hat · Red Hat Enterprise Linux 7version=kernel 3.10.0

Published CVSS scores

5.2NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:P
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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