CVE-2026-89565: Linux kernel · ipip: fix skb leak in collect_md mode when metadata_dst allocation fails
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · 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.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
The vulnerability has been resolved in the Linux kernel. Users should apply the official kernel updates that include the fix. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's ipip tunnel implementation causes a memory leak (skb leak) when metadata_dst allocation fails in collect_md mode. This occurs because ipip_tunnel_rcv() returns 0 without freeing the skb, leading to the packet buffer being leaked. Other tunnel drivers properly free the packet in this failure scenario, but ipip does not. Exploiting this requires an ipip or mplsip tunnel in collect_md mode and an atomic allocation failure.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89565 (opens in a new tab)
- git.kernel.org/stable/c/31e4be21dacee49395013caae28576484a049a4f (opens in a new tab)
- git.kernel.org/stable/c/6776efe4a52f289a3fc18f8adf19b035a7d8e1bb (opens in a new tab)
- git.kernel.org/stable/c/6d8c5b266d0035a061573843a7243be068eb6118 (opens in a new tab)
- git.kernel.org/stable/c/fd01f1a3ed4a189a784654f7c69eb565872f2e12 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89565.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/CVE-2026-89565 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89565 (opens in a new tab)
- git.kernel.org/linus/6776efe4a52f289a3fc18f8adf19b035a7d8e1bb (opens in a new tab)