7.1

CVE-2025-39683

tracing: Limit access to parser->buffer when trace_get_user failed

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.4.269 < 4.5
Linux ≫ Linux Kernel Version >= 4.9.269 < 4.10
Linux ≫ Linux Kernel Version >= 4.14.233 < 4.15
Linux ≫ Linux Kernel Version >= 4.19.191 < 4.20
Linux ≫ Linux Kernel Version >= 5.4.118 < 5.5
Linux ≫ Linux Kernel Version >= 5.10.36 < 5.10.241
Linux ≫ Linux Kernel Version >= 5.11.20 < 5.12
Linux ≫ Linux Kernel Version >= 5.12.3 < 5.15.190
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.149
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.103
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.44
Linux ≫ Linux Kernel Version >= 6.13 < 6.16.4
Linux ≫ Linux Kernel Version6.17 Updaterc1
Linux ≫ Linux Kernel Version6.17 Updaterc2
Debian ≫ Debian Linux Version11.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.058
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9
Patch
https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330
Patch
https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49
Patch
https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a
Patch
https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee
Patch
https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be
Patch
https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html