CVE-2025-39980: Linux kernel · nexthop: Forbid FDB status change while nexthop is in a group
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f0e49fd13afe9dea7a09a1c9537fd00cea22badb : patch Linux kernel soon.
Data as of 10 Nov 2026, 15:03 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in f0e49fd13afe9dea7a09a1c9537fd00cea22badb, ec428fff792b7bd15b248dafca2e654b666b1304, e1e87ac0daacd51f522ecd1645cd76b5809303ed +4
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Oct 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 has been implemented in the Linux kernel to prevent changing the FDB status of a nexthop while it is part of a group. Users should update to a fixed kernel version containing the patches identified by the commit hashes provided. No other mitigation is indicated or required.
Description
A vulnerability in the Linux kernel's nexthop subsystem allowed changing the FDB (Forwarding Database) status of a nexthop while it was part of a group, leading to invalid configurations. This could cause a kernel NULL pointer dereference and system crash (NPD). The issue has been fixed by forbidding FDB status changes on nexthops that are in a group.
References
- git.kernel.org/stable/c/e1e87ac0daacd51f522ecd1645cd76b5809303ed (opens in a new tab)
- git.kernel.org/stable/c/0e7bfe7a268ccbd7859730c529161cafbf44637c (opens in a new tab)
- git.kernel.org/stable/c/ec428fff792b7bd15b248dafca2e654b666b1304 (opens in a new tab)
- git.kernel.org/stable/c/24046d31f6f92220852d393d510b6062843e3fbd (opens in a new tab)
- git.kernel.org/stable/c/f0e49fd13afe9dea7a09a1c9537fd00cea22badb (opens in a new tab)
- git.kernel.org/stable/c/8dd4aa0122885f710930de135af2adc4ccc3238f (opens in a new tab)
- git.kernel.org/stable/c/390b3a300d7872cef9588f003b204398be69ce08 (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)