CVE-2026-80790: Linux kernel · nvmet-fc: fix invalid free in LS IOD error path
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 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 applied to the Linux kernel to correct the invalid free in the nvmet-fc LS IOD error path. Systems running affected kernel versions should update to the patched kernel version containing this fix. Since no specific patch links or affected versions are provided, users should consult the official Linux kernel advisories or distribution updates for the corrected kernel release. No additional mitigation steps are indicated.
Description
In the Linux kernel, the following vulnerability has been resolved: nvmet-fc: fix invalid free in LS IOD error path nvmet_fc_alloc_ls_iodlist() advances iod while initializing the LS IOD array. If an rqstbuf allocation or response buffer DMA mapping fails, the unwind loop decrements iod past the start of the array. The final kfree(iod) therefore frees an address before the allocated object. This can be reproduced with nvme-fcloop and failslab by setting fail-nth to 6 before creating a target port. KASAN reports: BUG: KASAN: invalid-free in nvmet_fc_register_targetport Free of addr ffff88816cf8ff48 by task nvmet_fail_nth/9552 Free the original allocation base stored in tgtport->iod instead. With this fix applied, the same sysfs write with fail-nth=6 returns -ENOMEM without any KASAN report.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80790 (opens in a new tab)
- git.kernel.org/stable/c/1a8f007faefe8c226ec65896589f8d59b0a8d5a5 (opens in a new tab)
- git.kernel.org/stable/c/371fb1bf902adaa59be32bd7e904a5317e604fd0 (opens in a new tab)
- git.kernel.org/stable/c/449e9c4f8db84ad9d9bb288029b230bcf590faa2 (opens in a new tab)
- git.kernel.org/stable/c/8bce9cd08aae4283badf8ddc11fbb6f57b75a81e (opens in a new tab)
- git.kernel.org/stable/c/94334ea92f4d7535f66f86e33681efa94827eddc (opens in a new tab)
- git.kernel.org/stable/c/b189c6e408896ccc23d2e76d7738847cdebf1532 (opens in a new tab)
- git.kernel.org/stable/c/ba98d6796d12258e837ece065d2ecb59d76ce4ff (opens in a new tab)
- git.kernel.org/stable/c/bb9489f0dce58da730d3479588d6710d7a2c1b45 (opens in a new tab)
- git.kernel.org/stable/c/d094582cce9c08516d714e7436a8f3b9211dda90 (opens in a new tab)
- ubuntu.com/security/CVE-2026-80790 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80790 (opens in a new tab)
- git.kernel.org/linus/ba98d6796d12258e837ece065d2ecb59d76ce4ff (opens in a new tab)