In the Linux kernel, the following vulnerability has been resolved: bpf: Fix re-attachment branch in bpf_tracing_prog_attach The following case can cause a crash due to missing attach_btf: 1) load rawtp program 2) load fentry program with rawtp as target_fd 3) create tracing link for fentry program with target_fd = 0 4) repeat 3 In 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: <TASK> ? __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/0x76 Return -EINVAL in this situation.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-02-22T16:21:43.756Z

Updated: 2024-08-02T00:07:19.536Z

Reserved: 2024-02-19T14:20:24.126Z

Link: CVE-2024-26591

cve-icon Vulnrichment

Updated: 2024-07-05T15:20:37.841Z

cve-icon NVD

Status : Analyzed

Published: 2024-02-22T17:15:09.157

Modified: 2024-03-18T17:54:44.267

Link: CVE-2024-26591

cve-icon Redhat

Severity : Low

Publid Date: 2024-02-22T00:00:00Z

Links: CVE-2024-26591 - Bugzilla