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CVE-2026-63990: Linux

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    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.

    Засегнати продукти

    • Linux Linux: cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 69b78b5f3033272e53a2dc2dad675962654a5b38; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 41e8478c4cd896d3abbe33d41afc90c84ac66602; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди f4d78a81f57df82e9d82a2c07471fed1a1235893; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 02f1c87ded33b43d48b4a1d665da15f2157b30d8; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 9ea8a648d9120f7652bcde1ce2c4ad66871af707; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 563090e5d450c665f70d955a39f9587afc7842eb; cd05acfe65ed2cf2db683fa9a6adb8d35635263b преди 8ba68464e4787b6a7ec938826e16124df20fd23d
    • Linux Linux: 2.6.25; преди 2.6.25; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.143 до 6.6.*; 6.12.93 до 6.12.*; 6.18.35 до 6.18.*; 7.0.12 до 7.0.*; от 7.1 нататък

    История

    • 19 юли 2026 Публикувано

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    CVE-2026-63990: Linux | freedomonline.bg