CVE-2025-21802: Linux kernel · net: hns3: fix oops when unload drivers paralleling
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 10 Nov 2026, 14:48 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 27 Feb 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Linux Linux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented by introducing a new mutex to protect the unload process in the Linux kernel. Users should update to the fixed versions to prevent the kernel oops. The affected versions are 4.19.214, 5.4.156, 5.10.76, and 5.14.15. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's hns3 network driver could cause a kernel oops (crash) when unloading drivers in parallel. This occurs because unloading the hclge driver disables SR-IOV for each ae_dev node, and if the hns3 driver is unloaded simultaneously, the removal of all ae_dev nodes can lead to a race condition causing an oops. The issue is addressed by introducing a new mutex to protect the unload process.
References
- git.kernel.org/stable/c/622d92a67656e5c4d2d6ccac02d688ed995418c6 (opens in a new tab)
- git.kernel.org/stable/c/8c640dd3d900cc8988a39c007591f1deee776df4 (opens in a new tab)
- git.kernel.org/stable/c/e876522659012ef2e73834a0b9f1cbe3f74d5fad (opens in a new tab)
- git.kernel.org/stable/c/b5a8bc47aa0a4aa8bca5466dfa2d12dbb5b3cd0c (opens in a new tab)
- git.kernel.org/stable/c/82736bb83fb0221319c85c2e9917d0189cd84e1e (opens in a new tab)
- git.kernel.org/stable/c/cafe9a27e22736d4a01b3933e36225f9857c7988 (opens in a new tab)
- git.kernel.org/stable/c/92e5995773774a3e70257e9c95ea03518268bea5 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/05/msg00030.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/03/msg00028.html (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)