CVE-2026-72086: Linux kernel · scsi: xen: scsiback: Free the command tag on the TMR submit-failure path
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, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% 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
An official patch is available and should be applied to affected Linux kernel versions to resolve the improper freeing of command tags on the TMR submit-failure path. Users should update to the fixed linux-azure kernel versions as provided by their vendor. No additional mitigation is indicated or required beyond applying the official fix.
Description
A vulnerability in the Linux kernel's scsi: xen: scsiback subsystem was resolved, involving improper freeing of command tags on the task-management request (TMR) submit-failure path. This flaw could allow a pvSCSI guest to leak command tags of a LUN's session and potentially stop the LUN by issuing specific abort or reset requests when target_submit_tmr() fails. The issue arises because the error path does not free the command tag properly, leading to resource leakage. A patch is available to address this issue.
References
- nvd.nist.gov/vuln/detail/CVE-2026-72086 (opens in a new tab)
- git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabda (opens in a new tab)
- git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271f (opens in a new tab)
- git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5 (opens in a new tab)
- git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33ad (opens in a new tab)
- git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179f (opens in a new tab)
- git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7 (opens in a new tab)
- git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f (opens in a new tab)
- ubuntu.com/security/CVE-2026-72086 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-72086 (opens in a new tab)
- git.kernel.org/linus/66aefc277ebb796ec285d550305535dc3fc0179f (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)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)