CVE-2025-68776: Linux kernel · net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c851e43b88b40bb7c20176c51cbf4f8c8d960dd9 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 13:18 UTC
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
Disclosed: evidence found.
CVE published 13 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/3ce95a57d8a1f0e20b637cdeddaaed81831ca819 (opens in a new tab)
- git.kernel.org/stable/c/c851e43b88b40bb7c20176c51cbf4f8c8d960dd9 (opens in a new tab)
- git.kernel.org/stable/c/7be6d25f4d974e44918ba3a5d58ebb9d36879087 (opens in a new tab)
- git.kernel.org/stable/c/8f289fa12926aae44347ca7d490e216555d8f255 (opens in a new tab)
- git.kernel.org/stable/c/1742974c24a9c1f1fd2e5edca0cbaccb720b397a (opens in a new tab)
- git.kernel.org/stable/c/6220d38a08f8837575cd8f830928b49a3a5a5095 (opens in a new tab)
- git.kernel.org/stable/c/188e0fa5a679570ea35474575e724d8211423d17 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)