CVE-2026-72385

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()

fprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of

the per-ip fprobe list and fills it in a second walk, both under

rcu_read_lock() only. A fprobe registered on an already-live ip can

become visible between the two walks, so the fill walk processes an

exit_handler the sizing walk did not count and used runs past

reserved_words. If the sizing walk counted nothing, fgraph_data is NULL

and the first write_fprobe_header() faults:

Oops: general protection fault, probably for non-canonical address ...

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167

Call Trace:

<TASK>

function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677

ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671

__kernel_text_address+0x9/0x40 kernel/e

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References