CVE-2026-72249: Linux kernel · netfilter: flowtable: use dst in this direction when pushing IPIP header
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 9.8 Critical · fixed in 7.0.0-1013.13~24.04.1 : patch Linux kernel as a priority.
Data as of 28 Oct 2026, 05:11 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1013.13~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +12
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 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.
Patches and advisories
- ubuntu.com/security/notices/USN-8816-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
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
A patch is available and has been released in Linux kernel version 7.0.0 and later. Users should update affected Linux kernel packages to the fixed versions listed in the Ubuntu advisory USN-8816-1 and reboot their systems to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No other mitigations are specified or necessary once the patch is applied.
Description
A critical vulnerability in the Linux kernel's netfilter flowtable subsystem related to IPIP header processing was resolved. The flaw involved using the route of the opposite direction to calculate headroom when pushing the IPIP header, instead of the correct route for the current direction. This bug affected the calculation of headroom and the IP fragment offset field, potentially allowing an attacker to compromise the system. Multiple Linux kernel versions prior to 7.0.0 with specific builds are affected. The issue has been fixed in Linux kernel version 7.0.0 and later. A high-severity CVSS score of 9.8 reflects the critical impact of this vulnerability. Users are advised to update to the fixed kernel versions and reboot to apply the patches.
References
- ubuntu.com/security/CVE-2026-72249 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-72249 (opens in a new tab)
- git.kernel.org/linus/c328b90c17fc5fa7786503695152880b2afb9326 (opens in a new tab)
- git.kernel.org/stable/c/c328b90c17fc5fa7786503695152880b2afb9326 (opens in a new tab)
- git.kernel.org/stable/c/ecb78fbb03d3f86e2e93767875e273308086a424 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8816-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)