net: mdio: fix undefined behavior in bit shift for __mdiobus_register
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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: 0.23% (FIRST EPSS).
- 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.
- Fixed version: Linux Linux 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7, 40e4eb324c59e11fcb927aa46742d28aba6ecb8a, 4954b5359eb141499492fadfab891e28905509e2.
Low priority for now. Upgrade to Linux Linux 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7, 40e4eb324c59e11fcb927aa46742d28aba6ecb8a, 4954b5359eb141499492fadfab891e28905509e2 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: net: mdio: fix undefined behavior in bit shift for __mdiobus_register Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c __mdiobus_register+0x49d/0x4e0 fixed_mdio_bus_init+0xd8/0x12d do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>
- Published
- May 1, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 12th percentile
- CWE
- —
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%
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.
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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.
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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.28 and later · before 4.9.333
- linux linux kernel4.10 and later · before 4.14.299
- linux linux kernel4.15 and later · before 4.19.265
- linux linux kernel4.20 and later · before 5.4.224
- linux linux kernel5.5 and later · before 5.10.154
- linux linux kernel5.11 and later · before 5.15.78
- linux linux kernel5.16 and later · before 6.0.8
- linux linux kernel6.1
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
- 2.6.28affected
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7affected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 7006176a3c863e3e353ce1b8a349ef5bb1b9320eaffected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before a3fafc974be37319679f36dc4e7cca7db1e02973affected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 4954b5359eb141499492fadfab891e28905509e2affected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 634f066d02bdb22a26da7deb0c7617ab1a65fc9daffected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 985a88bf0b27193522bba7856b1763f428cef19daffected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0affected · git
- 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and later · before 40e4eb324c59e11fcb927aa46742d28aba6ecb8aaffected · git
- before 2.6.28not 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 6.0.8-1 | 6.0.8-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7 | Vendor (CNA) |
| Linux Linux | 40e4eb324c59e11fcb927aa46742d28aba6ecb8a | Vendor (CNA) |
| Linux Linux | 4954b5359eb141499492fadfab891e28905509e2 | Vendor (CNA) |
| Linux Linux | 634f066d02bdb22a26da7deb0c7617ab1a65fc9d | Vendor (CNA) |
| Linux Linux | 6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0 | Vendor (CNA) |
| Linux Linux | 7006176a3c863e3e353ce1b8a349ef5bb1b9320e | Vendor (CNA) |
| Linux Linux | 985a88bf0b27193522bba7856b1763f428cef19d | Vendor (CNA) |
| Linux Linux | a3fafc974be37319679f36dc4e7cca7db1e02973 | Vendor (CNA) |
| debian:linux | 6.0.8-1 · 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-primary
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
Show all references (7 more)Show less
- git.kernel.org/stable/c/40e4eb324c59e11fcb927aa46742d28aba6ecb8a
- git.kernel.org/stable/c/4954b5359eb141499492fadfab891e28905509e2
- git.kernel.org/stable/c/634f066d02bdb22a26da7deb0c7617ab1a65fc9d
- git.kernel.org/stable/c/6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0
- git.kernel.org/stable/c/7006176a3c863e3e353ce1b8a349ef5bb1b9320e
- git.kernel.org/stable/c/985a88bf0b27193522bba7856b1763f428cef19d
- git.kernel.org/stable/c/a3fafc974be37319679f36dc4e7cca7db1e02973
Vendor advisories and official records. Exploit/PoC links are deliberately left out.