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VulnerabilityPublished Updated

CVE-2025-68776: Linux kernel · net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in c851e43b88b40bb7c20176c51cbf4f8c8d960dd9 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in c851e43b88b40bb7c20176c51cbf4f8c8d960dd9, 1742974c24a9c1f1fd2e5edca0cbaccb720b397a, 6220d38a08f8837575cd8f830928b49a3a5a5095 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < c851e43b88b40bb7c20176c51cbf4f8c8d960dd9
Fixed in
  • c851e43b88b40bb7c20176c51cbf4f8c8d960dd9
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 1742974c24a9c1f1fd2e5edca0cbaccb720b397a
Fixed in
  • 1742974c24a9c1f1fd2e5edca0cbaccb720b397a
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 6220d38a08f8837575cd8f830928b49a3a5a5095
Fixed in
  • 6220d38a08f8837575cd8f830928b49a3a5a5095
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 188e0fa5a679570ea35474575e724d8211423d17
Fixed in
  • 188e0fa5a679570ea35474575e724d8211423d17
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 8f289fa12926aae44347ca7d490e216555d8f255
Fixed in
  • 8f289fa12926aae44347ca7d490e216555d8f255
LinuxLinuxAffected
  • ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 7be6d25f4d974e44918ba3a5d58ebb9d36879087
Fixed in
  • 7be6d25f4d974e44918ba3a5d58ebb9d36879087

AI-suggested

A fix is available and has been applied in the Linux kernel. Systems running affected versions should update to a fixed kernel version that includes the patch adding the NULL check after __pskb_copy(). No additional mitigation steps are required beyond applying the official fix.

Description

A NULL pointer dereference vulnerability was identified and fixed in the Linux kernel's net/hsr subsystem in the function prp_get_untagged_frame(). The issue occurs because the function calls __pskb_copy() to allocate memory but does not check if the allocation failed, leading to a crash when skb_clone() is called with a NULL pointer. This results in a general protection fault and kernel crash. The fix adds a NULL check after __pskb_copy() to handle allocation failures gracefully.

References

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