Answer in brief
CVE-2025-39683 records a Unknown severity vulnerability in tracing: Limit access to parser->buffer when trace_get_user failed. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=634684d79733124f7470b226b0f42aada4426b07 <b842ef39c2ad6156c13afdec25ecc6792a9b67b9 || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <41b838420457802f21918df66764b6fbf829d330 || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <418b448e1d7470da9d4d4797f71782595ee69c49 || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <58ff8064cb4c7eddac4da1a59da039ead586950a || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <d0c68045b8b0f3737ed7bd6b8c83b7887014adee || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <3079517a5ba80901fe828a06998da64b9b8749be || >=8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 <6a909ea83f226803ea0e718f6e88613df9234d58 || 24cd31752f47699b89b4b3471155c8e599a1a23a || e9cb474de7ff7a970c2a3951c12ec7e3113c0c35 || 6ab671191f64b0da7d547e2ad4dc199ca7e5b558 || 3d9281a4ac7171c808f9507f0937eb236b353905 || 0b641b25870f02e2423e494365fc5243cc1e2759 || ffd51dbfd2900e50c71b5c069fe407957e52d61f || cdd107d7f18158d966c2bc136204fe826dac445c || >=5.10.36 <5.10.241 || >=4.4.269 <4.5 || >=4.9.269 <4.10 || >=4.14.233 <4.15 || >=4.19.191 <4.20 || >=5.4.118 <5.5 || >=5.11.20 <5.12 || >=5.12.3 <5.13 | b842ef39c2ad6156c13afdec25ecc6792a9b67b9, 41b838420457802f21918df66764b6fbf829d330, 418b448e1d7470da9d4d4797f71782595ee69c49, 58ff8064cb4c7eddac4da1a59da039ead586950a, d0c68045b8b0f3737ed7bd6b8c83b7887014adee, 3079517a5ba80901fe828a06998da64b9b8749be, 6a909ea83f226803ea0e718f6e88613df9234d58, 5.10.241, 4.5, 4.10, 4.15, 4.20, 5.5, 5.12, 5.13 |
| Linux/Linuxgeneric | 5.13 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Sep 5, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.