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VulnerabilityPublished Updated

CVE-2025-21925: Linux kernel · llc: do not use skb_get() before dev_queue_xmit()

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 10 Nov 2026, 14:48 UTC

Severity
High

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

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Apr 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

AI-suggested

A fix is available that replaces skb_get() with skb_clone() in the affected Linux kernel source file net/llc/llc_s_ac.c. Users should update to a Linux kernel version that includes this fix. Since this is a kernel-level issue, applying the official kernel patch or upgrading to a fixed kernel release is the recommended remediation.

Description

A vulnerability in the Linux kernel's LLC (Logical Link Control) networking code was fixed by replacing skb_get() with skb_clone() before calling dev_queue_xmit(). The issue could cause kernel crashes when using LLC with devices that do not support IFF_TX_SKB_SHARING, notably affecting the e1000 driver. This flaw was identified through syzbot testing and results in kernel BUGs and invalid opcode exceptions.

References

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