CVE-2025-38493

/// Technical description

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

tracing/osnoise: Fix crash in timerlat_dump_stack()

We have observed kernel panics when using timerlat with stack saving,

with the following dmesg output:

memcpy: detected buffer overflow: 88 byte write of buffer size 0

WARNING: CPU: 2 PID: 8153 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0

CPU: 2 UID: 0 PID: 8153 Comm: timerlatu/2 Kdump: loaded Not tainted 6.15.3-200.fc42.x86_64 #1 PREEMPT(lazy)

Call Trace:

<TASK>

? trace_buffer_lock_reserve+0x2a/0x60

__fortify_panic+0xd/0xf

__timerlat_dump_stack.cold+0xd/0xd

timerlat_dump_stack.part.0+0x47/0x80

timerlat_fd_read+0x36d/0x390

vfs_read+0xe2/0x390

? syscall_exit_to_user_mode+0x1d5/0x210

ksys_read+0x73/0xe0

do_syscall_64+0x7b/0x160

? exc_page_fault+0x7e/0x1a0

entry_SYSCALL_64_after_hwframe+0x76/0x7e

__timerlat_dump_stack() constructs the ftrace stack entry like this:

struct stack_entry *entry;

...

memcpy(&entry->caller, fstack->calls, size);

entr

/// 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