CVE-2025-68363: Linux kernel · bpf: Check skb->transport_header is set in bpf_skb_check_mtu
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d946f3c98328171fa50ddb908593cf833587f725 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 13:18 UTC
Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in d946f3c98328171fa50ddb908593cf833587f725, b3171a5e4622e915e94599a55f4964078bdec27e, 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Dec 2025
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 commits listed under fixedVersions. Users should update their Linux kernel to a version including these commits to resolve the issue. No additional mitigation actions are required.
Description
A vulnerability in the Linux kernel's bpf_skb_check_mtu helper function was fixed by adding a check to ensure skb->transport_header is set before use. This prevents warnings and potential issues when the BPF_MTU_CHK_SEGS flag is used and skb->transport_header might not be initialized.
References
- git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e (opens in a new tab)
- git.kernel.org/stable/c/97b876fa88322625228792cf7a5fd77531815a80 (opens in a new tab)
- git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9 (opens in a new tab)
- git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7 (opens in a new tab)
- git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 (opens in a new tab)
- git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725 (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)