CVE-2026-90108: Linux kernel · net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition
Affects Linux kernelSource GCVE Database
Not known to be exploited.
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 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 17 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
A fix has been implemented in the Linux kernel to free the stashed qentry before overwriting it during the REQ_ADD_LINK to ADD_LINK transition. Users should apply the updated kernel versions provided by their Linux distribution or vendor to remediate this issue. No additional mitigation actions are indicated.
Description
A memory management vulnerability in the Linux kernel's SMC (Shared Memory Communications) subsystem was resolved. The flaw involves a failure to free a previously stashed memory allocation (qentry) before overwriting it during a specific state transition in the LLC flow, causing a memory leak. This occurs when transitioning from REQ_ADD_LINK to ADD_LINK states in the smc_llc_event_handler function. The issue affects multiple specific Linux kernel versions used in various Ubuntu HWE edge releases.
References
- ubuntu.com/security/CVE-2026-90108 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-90108 (opens in a new tab)
- git.kernel.org/linus/036322025d6e440cb75fc6fecbba9a16b271a2ae (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90108.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)