CVE-2025-39683
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Limit access to parser->buffer when trace_get_user failed When the length of the string written to set_ftrace_filter exceeds FTRACE_BUFF_MAX, the following KASAN alarm will be triggered: BUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0 Read of size 1 at addr ffff0000d00bd5ba by task ash/165 CPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x34/0x50 (C) dump_stack_lvl+0xa0/0x158 print_address_description.constprop.0+0x88/0x398 print_report+0xb0/0x280 kasan_report+0xa4/0xf0 __asan_report_load1_noabort+0x20/0x30 strsep+0x18c/0x1b0 ftrace_process_regex.isra.0+0x100/0x2d8 ftrace_regex_release+0x484/0x618 __fput+0x364/0xa58 ____fput+0x28/0x40 task_work_run+0x154/0x278 do_notify_resume+0x1f0/0x220 el0_svc+0xec/0xf0 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x1ac/0x1b0 The reason is that trace_get_user will fail when processing a string longer than FTRACE_BUFF_MAX, but not set the end of parser->buffer to 0. Then an OOB access will be triggered in ftrace_regex_release-> ftrace_process_regex->strsep->strpbrk. We can solve this problem by limiting access to parser->buffer when trace_get_user failed.
How to fix
- linux linux_kernel4.5, 4.10, 4.15, 4.20, 5.5, 5.10.241, 5.12, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.4.269 ≤ v < 4.5, 4.9.269 ≤ v < 4.10, 4.14.233 ≤ v < 4.15, 4.19.191 ≤ v < 4.20, 5.4.118 ≤ v < 5.5, 5.10.36 ≤ v < 5.10.241, 5.11.20 ≤ v < 5.12, 5.12.3 ≤ v < 5.15.190, 5.16 ≤ v < 6.1.149, 6.2 ≤ v < 6.6.103, 6.7 ≤ v < 6.12.44, 6.13 ≤ v < 6.16.4, 6.17 | 4.5, 4.10, 4.15, 4.20, 5.5, 5.10.241, 5.12, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 |
| debian debian_linux | 11.0 | — |
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