CVE-2026-90391: lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone
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: 0.21% (FIRST EPSS).
- Fixed version: Linux Linux 2636569ea7c19d9a40db4a1e8d0a027bdacf1569, 50606ced303782f8715e2d0b98ca374ea498fa29, 541a67f21ab807c8dbc0ea88d5a2eb73b2618090; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
Low priority for now. Upgrade to Linux Linux 2636569ea7c19d9a40db4a1e8d0a027bdacf1569, 50606ced303782f8715e2d0b98ca374ea498fa29, 541a67f21ab807c8dbc0ea88d5a2eb73b2618090; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone dmirror_fault() is called from the dmirror_read() and dmirror_write() retry loops after dmirror_do_read() or dmirror_do_write() finds a missing device page table entry. If the mirrored mm has already exited, mmget_not_zero() fails. The current code returns 0 in that case, which tells the caller that faulting succeeded even though no page was faulted and no device page table entry was installed. The caller then retries the same address, hits -ENOENT again, and can loop forever without making progress. Return -EFAULT instead, so the ioctl fails when the mirrored mm is no longer faultable.
- Published
- Sep 17, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.2% · 11th percentile
- CWE
- —
Report tools
Action score
0
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi 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.
We use this product, ask for helpAffected 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
- 5.8affected
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 50606ced303782f8715e2d0b98ca374ea498fa29affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 541a67f21ab807c8dbc0ea88d5a2eb73b2618090affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before d8e64ffab01e032ae29159d27230ace8cf8bdc80affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 2636569ea7c19d9a40db4a1e8d0a027bdacf1569affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 701347e31aa607f3782403151a3125729d685275affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before a2074f86fc9653831e4fb7b711bb715db330f182affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 6a8024511ddf4877435c34fb3d6028aa8e590649affected · git
- before 5.8not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.190-1 | 6.1.190-1 |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.6-1 | 7.2.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-90389Sep 17, 2026 · md: scope memalloc_noio to allocation critical sections0Monitor
- ← EarlierCVE-2026-90390Sep 17, 2026 · md/bitmap: resume array on backlog_store() error path0Monitor
- Later →CVE-2026-90392Sep 17, 2026 · bpf: Fix potential UAF when reading bpf link info31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 2636569ea7c19d9a40db4a1e8d0a027bdacf1569 | Vendor (CNA) |
| Linux Linux | 50606ced303782f8715e2d0b98ca374ea498fa29 | Vendor (CNA) |
| Linux Linux | 541a67f21ab807c8dbc0ea88d5a2eb73b2618090 | Vendor (CNA) |
| Linux Linux | 6a8024511ddf4877435c34fb3d6028aa8e590649 | Vendor (CNA) |
| Linux Linux | 701347e31aa607f3782403151a3125729d685275 | Vendor (CNA) |
| Linux Linux | a2074f86fc9653831e4fb7b711bb715db330f182 | Vendor (CNA) |
| Linux Linux | af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655 | Vendor (CNA) |
| Linux Linux | d8e64ffab01e032ae29159d27230ace8cf8bdc80 | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 | 6.6.157.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.190-1 · Debian:12 | Package registry (OSV) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~deb12u1 · Debian:12 | Package 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
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✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/50606ced303782f8715e2d0b98ca374ea498fa29
- git.kernel.org/stable/c/541a67f21ab807c8dbc0ea88d5a2eb73b2618090
- git.kernel.org/stable/c/6a8024511ddf4877435c34fb3d6028aa8e590649
- git.kernel.org/stable/c/701347e31aa607f3782403151a3125729d685275
- git.kernel.org/stable/c/a2074f86fc9653831e4fb7b711bb715db330f182
- git.kernel.org/stable/c/af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655
- git.kernel.org/stable/c/d8e64ffab01e032ae29159d27230ace8cf8bdc80
Vendor advisories and official records. Exploit/PoC links are deliberately left out.