CVE-2024-49875Network attack vector

NFS server panic via unmapped checksum error

Published Oct 21, 2024 · Updated Aug 5, 2026

Improper error handling in Linux kernel nfsd allows remote attackers to panic an NFS server via READDIR against a directory yielding EBADMSG. nfsd_buffered_readdir passes the ext4 checksum failure to nfserrno, which treats the unmapped errno as nonstandard and executes WARN_ONCE. An affected NFS export must expose the failing directory; the warning interrupts the host when panic_on_warn is enabled and otherwise records an oops.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper error handling in Linux kernel nfsd allows remote attackers to panic an NFS server via READDIR against a directory yielding EBADMSG. nfsd_buffered_readdir passes the ext4 checksum failure to nfserrno, which treats the unmapped errno as nonstandard and executes WARN_ONCE. An affected NFS export must expose the failing directory; the warning interrupts the host when panic_on_warn is enabled and otherwise records an oops.

The record

CVE
CVE-2024-49875
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-354, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.4
  2. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <0ea4333c679f333e23956de743ad17387819d3f2
  3. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <340e61e44c1d2a15c42ec72ade9195ad525fd048
  4. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <6fe058502f8864649c3d614b06b2235223798f48
  5. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <825789ca94602543101045ad3aad19b2b60c6b2a
  6. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <c76005adfa93d1a027433331252422078750321f
  7. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <e9cfecca22a36b927a440abc6307efb9e138fed5
  8. Affected versionversion=6a797d2737838906f2ea0a31686e87c3151e21ca <f7d8ee9db94372b8235f5f22bb24381891594c42

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=6a797d2737838906f2ea0a31686e87c3151e21ca <0ea4333c679f333e23956de743ad17387819d3f2; version=6a797d2737838906f2ea0a31686e87c3151e21ca <340e61e44c1d2a15c42ec72ade9195ad525fd048; version=6a797d2737838906f2ea0a31686e87c3151e21ca <6fe058502f8864649c3d614b06b2235223798f48; version=6a797d2737838906f2ea0a31686e87c3151e21ca <825789ca94602543101045ad3aad19b2b60c6b2a; version=6a797d2737838906f2ea0a31686e87c3151e21ca <c76005adfa93d1a027433331252422078750321f; version=6a797d2737838906f2ea0a31686e87c3151e21ca <e9cfecca22a36b927a440abc6307efb9e138fed5; version=6a797d2737838906f2ea0a31686e87c3151e21ca <f7d8ee9db94372b8235f5f22bb24381891594c42

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo