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CVE-2024-26591

Description

In the Linux kernel, the following vulnerability has been resolved:bpf: Fix re-attachment branch in bpf_tracing_prog_attachThe following case can cause a crash due to missing attach_btf:1) load rawtp program2) load fentry program with rawtp as target_fd3) create tracing link for fentry program with target_fd = 04) repeat 3In the end we have:- prog->aux->dst_trampoline == NULL- tgt_prog == NULL (because we did not provide target_fd to link_create)- prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)- the program was loaded for tgt_prog but we have no way to find out which one BUG: kernel NULL pointer dereference, address: 0000000000000058 Call Trace: ? __die+0x20/0x70 ? page_fault_oops+0x15b/0x430 ? fixup_exception+0x22/0x330 ? exc_page_fault+0x6f/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_tracing_prog_attach+0x279/0x560 ? btf_obj_id+0x5/0x10 bpf_tracing_prog_attach+0x439/0x560 __sys_bpf+0x1cf4/0x2de0 __x64_sys_bpf+0x1c/0x30 do_syscall_64+0x41/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76Return -EINVAL in this situation.

POC

Reference

No PoCs from references.

Github

- https://github.com/fkie-cad/nvd-json-data-feeds