udf: Detect system inodes linked into directory hierarchy
In the Linux kernel, the following vulnerability has been resolved: udf: Detect system inodes linked into directory hierarchy When UDF filesystem is corrupted, hidden system inodes can be linked into directory hierarchy which is an avenue for further serious corruption of the filesystem and kernel confusion as noticed by syzbot fuzzed images. Refuse to access system inodes linked into directory hierarchy and vice versa.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Oct 22, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.2% · 5th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
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
- 801c7a20d255e300ab51a6fcb1d0e218d136b16f, 3.18affected
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 1dc71eeb198a8daa17d0c995998a53b0b749a158affected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before d747b31e2925a2f384e7dd1901a2e5bc5f984ed8affected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before a44ec34b90440ada190924f5908b97026504fdcdaffected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 37e74003d81e79457535cbbdfa1603431c03fac0affected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 1f328751b65c49c13a312d67a3bf27766b85baf7affected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 9e3b5ef7d02eaa6553e79b4af9bd99227280f245affected · git
- 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 85a37983ec69cc9fcd188bc37c4de15ee326355aaffected · git
- 3.17.2 and later · before 3.18affected · semver
- before 3.18not 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 6.1.20-1 | 6.1.20-1 |
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
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 1dc71eeb198a8daa17d0c995998a53b0b749a158 | Vendor (CNA) |
| Linux Linux | 1f328751b65c49c13a312d67a3bf27766b85baf7 | Vendor (CNA) |
| Linux Linux | 3.18 | Vendor (CNA) |
| Linux Linux | 37e74003d81e79457535cbbdfa1603431c03fac0 | Vendor (CNA) |
| Linux Linux | 85a37983ec69cc9fcd188bc37c4de15ee326355a | Vendor (CNA) |
| Linux Linux | 9e3b5ef7d02eaa6553e79b4af9bd99227280f245 | Vendor (CNA) |
| Linux Linux | a44ec34b90440ada190924f5908b97026504fdcd | Vendor (CNA) |
| Linux Linux | d747b31e2925a2f384e7dd1901a2e5bc5f984ed8 | Vendor (CNA) |
| debian:linux | 6.1.20-1 · 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).
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 researchersFinders, 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
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/1dc71eeb198a8daa17d0c995998a53b0b749a158
- git.kernel.org/stable/c/1f328751b65c49c13a312d67a3bf27766b85baf7
- git.kernel.org/stable/c/37e74003d81e79457535cbbdfa1603431c03fac0
- git.kernel.org/stable/c/85a37983ec69cc9fcd188bc37c4de15ee326355a
- git.kernel.org/stable/c/9e3b5ef7d02eaa6553e79b4af9bd99227280f245
- git.kernel.org/stable/c/a44ec34b90440ada190924f5908b97026504fdcd
- git.kernel.org/stable/c/d747b31e2925a2f384e7dd1901a2e5bc5f984ed8
Vendor advisories and official records. Exploit/PoC links are deliberately left out.