CVE-2026-72228: Linux kernel · batman-adv: frag: fix primary_if leak on failed linearization
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +41
Exploitation 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.
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 should be applied to affected linux-azure kernel versions. The vendor advisory confirms that this issue is fixed in updated kernel releases. Users should update to the fixed versions to remediate this vulnerability.
Description
A vulnerability in the Linux kernel's batman-adv subsystem was fixed to address a resource leak issue. Specifically, when linearization of a socket buffer (skb) with a frag_list fails, the kernel did not properly release the reference to the primary interface (primary_if), causing a resource leak. This issue affects specific versions of the linux-azure kernel. The vulnerability has been patched.
References
- nvd.nist.gov/vuln/detail/CVE-2026-72228 (opens in a new tab)
- git.kernel.org/stable/c/353d2c1d5492e53ae34f490a84494124dc3d3531 (opens in a new tab)
- git.kernel.org/stable/c/4f3bf293f7662500142234ae6f23725953690bc9 (opens in a new tab)
- git.kernel.org/stable/c/777a88256d6f70672116e53400659cc417e1feaa (opens in a new tab)
- git.kernel.org/stable/c/a90f4fff9025371bce5371daa610af957de8dd6a (opens in a new tab)
- git.kernel.org/stable/c/c1b28432fd6345e0d2308f39c507ed5750c265d2 (opens in a new tab)
- git.kernel.org/stable/c/d2148aeee93197ccf821114489775132f28eebf5 (opens in a new tab)
- git.kernel.org/stable/c/db3c700826e8126fbdaa83468a9c4ee4ee65319f (opens in a new tab)
- git.kernel.org/stable/c/e59b1960f71521ce4eb4397c4e82f5285601ab57 (opens in a new tab)
- ubuntu.com/security/CVE-2026-72228 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-72228 (opens in a new tab)
- git.kernel.org/linus/353d2c1d5492e53ae34f490a84494124dc3d3531 (opens in a new tab)
- ubuntu.com/security/notices/USN-8876-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)