CVE-2025-39683

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux634684d79733124f7470b226b0f42aada4426b07 < b842ef39c2ad6156c13afdec25ecc6792a9b67b9affected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < 41b838420457802f21918df66764b6fbf829d330affected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < 418b448e1d7470da9d4d4797f71782595ee69c49affected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < 58ff8064cb4c7eddac4da1a59da039ead586950aaffected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < d0c68045b8b0f3737ed7bd6b8c83b7887014adeeaffected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < 3079517a5ba80901fe828a06998da64b9b8749beaffected
LinuxLinux8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 < 6a909ea83f226803ea0e718f6e88613df9234d58affected
LinuxLinux24cd31752f47699b89b4b3471155c8e599a1a23aaffected
LinuxLinuxe9cb474de7ff7a970c2a3951c12ec7e3113c0c35affected
LinuxLinux6ab671191f64b0da7d547e2ad4dc199ca7e5b558affected
LinuxLinux3d9281a4ac7171c808f9507f0937eb236b353905affected
LinuxLinux0b641b25870f02e2423e494365fc5243cc1e2759affected
LinuxLinuxffd51dbfd2900e50c71b5c069fe407957e52d61faffected
LinuxLinuxcdd107d7f18158d966c2bc136204fe826dac445caffected
LinuxLinux5.10.36 < 5.10.241affected
LinuxLinux4.4.269 < 4.5affected
LinuxLinux4.9.269 < 4.10affected
LinuxLinux4.14.233 < 4.15affected
LinuxLinux4.19.191 < 4.20affected
LinuxLinux5.4.118 < 5.5affected
LinuxLinux5.11.20 < 5.12affected
LinuxLinux5.12.3 < 5.13affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.10.241 <= 5.10.*unaffected
LinuxLinux5.15.190 <= 5.15.*unaffected
LinuxLinux6.1.149 <= 6.1.*unaffected
LinuxLinux6.6.103 <= 6.6.*unaffected
LinuxLinux6.12.44 <= 6.12.*unaffected
LinuxLinux6.16.4 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

Additional References

References