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VulnerabilityPublished Updated

CVE-2025-68363: Linux kernel · bpf: Check skb->transport_header is set in bpf_skb_check_mtu

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d946f3c98328171fa50ddb908593cf833587f725 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:18 UTC

Severity
Low

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

  1. Disclosed: evidence found.

    CVE published 24 Dec 2025

  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
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < d946f3c98328171fa50ddb908593cf833587f725
Fixed in
  • d946f3c98328171fa50ddb908593cf833587f725
LinuxLinuxAffected
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < b3171a5e4622e915e94599a55f4964078bdec27e
Fixed in
  • b3171a5e4622e915e94599a55f4964078bdec27e
LinuxLinuxAffected
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5
Fixed in
  • 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5
LinuxLinuxAffected
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < 97b876fa88322625228792cf7a5fd77531815a80
Fixed in
  • 97b876fa88322625228792cf7a5fd77531815a80
LinuxLinuxAffected
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < 30ce906557a21adef4cba5901c8e995dc18263a9
Fixed in
  • 30ce906557a21adef4cba5901c8e995dc18263a9
LinuxLinuxAffected
  • ≥ 34b2021cc61642d61c3cf943d9e71925b827941b, < 1c30e4afc5507f0069cc09bd561e510e4d97fbf7
Fixed in
  • 1c30e4afc5507f0069cc09bd561e510e4d97fbf7

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

Community reviews

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