bonding: refuse to enslave CAN devices
In the Linux kernel, the following vulnerability has been resolved: bonding: refuse to enslave CAN devices syzbot reported a kernel paging request crash in can_rx_unregister() inside net/can/af_can.c. The crash occurs because a virtual CAN device (vxcan) is being enslaved to a bonding master. During the enslavement process, the bonding driver mutates and modifies the network device states to fit an Ethernet-like aggregation model. However, CAN devices operate on a completely different Layer 2 architecture, relying on the CAN mid-layer private data structure (can_ml_priv) instead of standard Ethernet structures. Since bonding does not initialize or maintain these CAN structures, subsequent operations on the half-enslaved interface (such as closing associated sockets via isotp_release) lead to a null-pointer dereference when accessing the CAN receiver lists. Bonding CAN interfaces is architecturally invalid as CAN lacks MAC addresses, ARP capabilities, and standard Ethernet link-layer mechanisms. While generic loopback devices are blocked globally in net/core/dev.c, virtual CAN devices bypass this check because they do not carry the IFF_LOOPBACK flag, despite acting as local software-loopbacks. Fix this by explicitly blocking network devices of type ARPHRD_CAN from being enslaved at the very beginning of bond_enslave(). This prevents illegal state mutations, eliminates the resulting KASAN crashes, and avoids potential memory leaks from incomplete socket cleanups. As the CAN support has been added a long time after bonding the Fixes-tag points to the introduction of ARPHRD_CAN that would have needed a specific handling in bonding_main.c.
Noroxi analysis
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We use this product, ask for help- Published
- Jul 19, 2026
- Updated
- Jul 30, 2026
- EPSS
- 0.2% · 7th percentile
- CWE
- —
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Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Affected systems
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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
- 2.6.25affected
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 69b78b5f3033272e53a2dc2dad675962654a5b38affected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 41e8478c4cd896d3abbe33d41afc90c84ac66602affected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before f4d78a81f57df82e9d82a2c07471fed1a1235893affected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 02f1c87ded33b43d48b4a1d665da15f2157b30d8affected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 9ea8a648d9120f7652bcde1ce2c4ad66871af707affected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 563090e5d450c665f70d955a39f9587afc7842ebaffected · git
- cd05acfe65ed2cf2db683fa9a6adb8d35635263b and later · before 8ba68464e4787b6a7ec938826e16124df20fd23daffected · git
- before 2.6.25not affected · semver
- 5.15.210 and later · up to and including 5.15.*not 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 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.94-1 | 6.12.94-1 |
| Debian:14 | linux | before 7.0.12-1 | 7.0.12-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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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 | 02f1c87ded33b43d48b4a1d665da15f2157b30d8 | Vendor (CNA) |
| Linux Linux | 41e8478c4cd896d3abbe33d41afc90c84ac66602 | Vendor (CNA) |
| Linux Linux | 563090e5d450c665f70d955a39f9587afc7842eb | Vendor (CNA) |
| Linux Linux | 69b78b5f3033272e53a2dc2dad675962654a5b38 | Vendor (CNA) |
| Linux Linux | 8ba68464e4787b6a7ec938826e16124df20fd23d | Vendor (CNA) |
| Linux Linux | 9ea8a648d9120f7652bcde1ce2c4ad66871af707 | Vendor (CNA) |
| Linux Linux | f4d78a81f57df82e9d82a2c07471fed1a1235893 | Vendor (CNA) |
| debian:linux | 6.1.176-1 · 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
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/02f1c87ded33b43d48b4a1d665da15f2157b30d8
- git.kernel.org/stable/c/41e8478c4cd896d3abbe33d41afc90c84ac66602
- git.kernel.org/stable/c/563090e5d450c665f70d955a39f9587afc7842eb
- git.kernel.org/stable/c/69b78b5f3033272e53a2dc2dad675962654a5b38
- git.kernel.org/stable/c/8ba68464e4787b6a7ec938826e16124df20fd23d
- git.kernel.org/stable/c/9ea8a648d9120f7652bcde1ce2c4ad66871af707
- git.kernel.org/stable/c/f4d78a81f57df82e9d82a2c07471fed1a1235893
Vendor advisories and official records. Exploit/PoC links are deliberately left out.