CVE-2026-99041: Linux kernel · ip6_gre: remove obsolete ERSPAN PMTU update
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f5b143f4cd3fb7673df8d727550478a4b762908a : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:30 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in f5b143f4cd3fb7673df8d727550478a4b762908a, b14a682ad7d45345701e08f9279d483a1da8b36c, 8f27260b989f488760289276377db24fbfb20bfa +2
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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– |
AI-suggested
A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update to a Linux kernel version that includes these commits to remediate the vulnerability. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's ip6_gre module involving obsolete ERSPAN Path MTU (PMTU) update handling has been resolved. The issue caused a null pointer dereference when processing metadata IP tunnel destinations without output devices, leading to kernel panic. The obsolete code was removed to align ERSPAN with IPv6 GRE PMTU handling.
References
- git.kernel.org/stable/c/b14a682ad7d45345701e08f9279d483a1da8b36c (opens in a new tab)
- git.kernel.org/stable/c/f5b143f4cd3fb7673df8d727550478a4b762908a (opens in a new tab)
- git.kernel.org/stable/c/2d06cb25a497d3a7034ef9d172626c2d6620a0f1 (opens in a new tab)
- git.kernel.org/stable/c/8f27260b989f488760289276377db24fbfb20bfa (opens in a new tab)
- git.kernel.org/stable/c/8bc60db48e8cba35488bbd6e1f94aa990afa275a (opens in a new tab)