CVE-2024-56688Network attack vector

Service interruption via stale SunRPC timeout flag

Published Dec 28, 2024 · Updated Aug 5, 2026

NULL pointer dereference in affected Linux kernel releases allows remote attackers to interrupt service through SunRPC TCP transport resets. Resetting a transport clears transport->sock but leaves XPRT_SOCK_UPD_TIMEOUT set, so xs_tcp_send_request calls xs_tcp_set_socket_timeouts with a NULL socket. An existing NFSv4 client connection and a malicious server or on-path attacker are required; the fault wedges the mount and can panic configured systems.

CVSS severity5.5
Medium
EPSS probability0.54%
Next 30 days · Sep 17, 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

NULL pointer dereference in affected Linux kernel releases allows remote attackers to interrupt service through SunRPC TCP transport resets. Resetting a transport clears transport->sock but leaves XPRT_SOCK_UPD_TIMEOUT set, so xs_tcp_send_request calls xs_tcp_set_socket_timeouts with a NULL socket. An existing NFSv4 client connection and a malicious server or on-path attacker are required; the fault wedges the mount and can panic configured systems.

The record

CVE
CVE-2024-56688
Published
Dec 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 28, 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=4.11
  2. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <3811172e8c98ceebd12fe526ca6cb37a1263c964
  3. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <4db9ad82a6c823094da27de4825af693a3475d51
  4. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <638a8fa5a7e641f9401346c57e236f02379a0c40
  5. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <66d11ca91bf5100ae2e6b5efad97e58d8448843a
  6. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <86a1f9fa24804cd7f9d7dd3f24af84fc7f8ec02e
  7. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <87a95ee34a48dfad198a2002e4966e1d63d53f2b
  8. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <cc91d59d34ff6a6fee1c0b48612081a451e05e9a
  9. Affected versionversion=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <fe6cbf0b2ac3cf4e21824a44eaa336564ed5e960

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <3811172e8c98ceebd12fe526ca6cb37a1263c964; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <4db9ad82a6c823094da27de4825af693a3475d51; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <638a8fa5a7e641f9401346c57e236f02379a0c40; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <66d11ca91bf5100ae2e6b5efad97e58d8448843a; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <86a1f9fa24804cd7f9d7dd3f24af84fc7f8ec02e; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <87a95ee34a48dfad198a2002e4966e1d63d53f2b; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <cc91d59d34ff6a6fee1c0b48612081a451e05e9a; version=7196dbb02ea05835b9ee56910ee82cb55422c7f1 <fe6cbf0b2ac3cf4e21824a44eaa336564ed5e960

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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-476NULL Pointer Dereference
T1499.004Application 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