CVE-2025-68776Network attack vector

Remote crash via unchecked frame-copy allocation

Published Jan 13, 2026 · Updated Jan 13, 2026

NULL pointer dereference in Linux Kernel HSR/PRP forwarding allows remote attackers to crash affected systems via crafted network frames. prp_get_untagged_frame() assigns __pskb_copy() to frame->skb_std without checking for allocation failure, then passes a NULL pointer to skb_clone(). Reachability requires HSR/PRP forwarding and a failed frame-copy allocation; the demonstrated consequence is a kernel crash and service interruption.

CVSS severity8.2
High
EPSS probability0.21%
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

NULL pointer dereference in Linux Kernel HSR/PRP forwarding allows remote attackers to crash affected systems via crafted network frames. prp_get_untagged_frame() assigns __pskb_copy() to frame->skb_std without checking for allocation failure, then passes a NULL pointer to skb_clone(). Reachability requires HSR/PRP forwarding and a failed frame-copy allocation; the demonstrated consequence is a kernel crash and service interruption.

The record

CVE
CVE-2025-68776
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=3.17
  2. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <1742974c24a9c1f1fd2e5edca0cbaccb720b397a
  3. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <188e0fa5a679570ea35474575e724d8211423d17
  4. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <6220d38a08f8837575cd8f830928b49a3a5a5095
  5. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <7be6d25f4d974e44918ba3a5d58ebb9d36879087
  6. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <8f289fa12926aae44347ca7d490e216555d8f255

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.17; version=f266a683a4804dc499efc6c2206ef68efed029d0 <1742974c24a9c1f1fd2e5edca0cbaccb720b397a; version=f266a683a4804dc499efc6c2206ef68efed029d0 <188e0fa5a679570ea35474575e724d8211423d17; version=f266a683a4804dc499efc6c2206ef68efed029d0 <6220d38a08f8837575cd8f830928b49a3a5a5095; version=f266a683a4804dc499efc6c2206ef68efed029d0 <7be6d25f4d974e44918ba3a5d58ebb9d36879087; version=f266a683a4804dc499efc6c2206ef68efed029d0 <8f289fa12926aae44347ca7d490e216555d8f255

Published CVSS scores

5.9SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2SUSECVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

T1499Endpoint Denial of Service

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