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NVD / CVE Program· CNA Linux

CVE-2026-80790: nvmet-fc: fix invalid free in LS IOD error path

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 1a8f007faefe8c226ec65896589f8d59b0a8d5a5, 371fb1bf902adaa59be32bd7e904a5317e604fd0, 449e9c4f8db84ad9d9bb288029b230bcf590faa2.

Low priority for now. Upgrade to Linux Linux 1a8f007faefe8c226ec65896589f8d59b0a8d5a5, 371fb1bf902adaa59be32bd7e904a5317e604fd0, 449e9c4f8db84ad9d9bb288029b230bcf590faa2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.10affected
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before b189c6e408896ccc23d2e76d7738847cdebf1532affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before 449e9c4f8db84ad9d9bb288029b230bcf590faa2affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before 1a8f007faefe8c226ec65896589f8d59b0a8d5a5affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before d094582cce9c08516d714e7436a8f3b9211dda90affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before 371fb1bf902adaa59be32bd7e904a5317e604fd0affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before 8bce9cd08aae4283badf8ddc11fbb6f57b75a81eaffected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before bb9489f0dce58da730d3479588d6710d7a2c1b45affected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before 94334ea92f4d7535f66f86e33681efa94827eddcaffected · git
    • c53432030d86429dc9fe5adc3d68cb9d1343b0b2 and later · before ba98d6796d12258e837ece065d2ecb59d76ce4ffaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.107-16.12.107-1
Debian:14linuxbefore 7.1.12-17.1.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80788Sep 4, 2026 · nvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations
    0Monitor
  • ← EarlierCVE-2026-80789Sep 4, 2026 · nvmet-tcp: bound SGL data length before allocating command buffers
    0Monitor
  • Later →CVE-2026-80791Sep 4, 2026 · nvmet-auth: zero the AUTH_RECEIVE response buffer
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1a8f007faefe8c226ec65896589f8d59b0a8d5a5Vendor (CNA)
Linux Linux371fb1bf902adaa59be32bd7e904a5317e604fd0Vendor (CNA)
Linux Linux449e9c4f8db84ad9d9bb288029b230bcf590faa2Vendor (CNA)
Linux Linux8bce9cd08aae4283badf8ddc11fbb6f57b75a81eVendor (CNA)
Linux Linux94334ea92f4d7535f66f86e33681efa94827eddcVendor (CNA)
Linux Linuxb189c6e408896ccc23d2e76d7738847cdebf1532Vendor (CNA)
Linux Linuxba98d6796d12258e837ece065d2ecb59d76ce4ffVendor (CNA)
Linux Linuxbb9489f0dce58da730d3479588d6710d7a2c1b45Vendor (CNA)
Linux Linuxd094582cce9c08516d714e7436a8f3b9211dda90Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records