{"id":"CVE-2025-39683","summary":"tracing: Limit access to parser-\u003ebuffer when trace_get_user failed","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Limit access to parser-\u003ebuffer when trace_get_user failed\n\nWhen the length of the string written to set_ftrace_filter exceeds\nFTRACE_BUFF_MAX, the following KASAN alarm will be triggered:\n\nBUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0\nRead of size 1 at addr ffff0000d00bd5ba by task ash/165\n\nCPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty\nHardware name: linux,dummy-virt (DT)\nCall trace:\n show_stack+0x34/0x50 (C)\n dump_stack_lvl+0xa0/0x158\n print_address_description.constprop.0+0x88/0x398\n print_report+0xb0/0x280\n kasan_report+0xa4/0xf0\n __asan_report_load1_noabort+0x20/0x30\n strsep+0x18c/0x1b0\n ftrace_process_regex.isra.0+0x100/0x2d8\n ftrace_regex_release+0x484/0x618\n __fput+0x364/0xa58\n ____fput+0x28/0x40\n task_work_run+0x154/0x278\n do_notify_resume+0x1f0/0x220\n el0_svc+0xec/0xf0\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1ac/0x1b0\n\nThe reason is that trace_get_user will fail when processing a string\nlonger than FTRACE_BUFF_MAX, but not set the end of parser-\u003ebuffer to 0.\nThen an OOB access will be triggered in ftrace_regex_release-\u003e\nftrace_process_regex-\u003estrsep-\u003estrpbrk. We can solve this problem by\nlimiting access to parser-\u003ebuffer when trace_get_user failed.","modified":"2026-04-02T12:48:06.557215Z","published":"2025-09-05T17:20:49.821Z","related":["MGASA-2025-0234","MGASA-2025-0235","SUSE-SU-2025:21040-1","SUSE-SU-2025:21052-1","SUSE-SU-2025:21056-1","SUSE-SU-2025:21064-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4128-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4140-1","SUSE-SU-2025:4141-1","SUSE-SU-2025:4301-1","openSUSE-SU-2025:20081-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39683.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39683.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39683"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"634684d79733124f7470b226b0f42aada4426b07"},{"fixed":"b842ef39c2ad6156c13afdec25ecc6792a9b67b9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8c9af478c06bb1ab1422f90d8ecbc53defd44bc3"},{"fixed":"41b838420457802f21918df66764b6fbf829d330"},{"fixed":"418b448e1d7470da9d4d4797f71782595ee69c49"},{"fixed":"58ff8064cb4c7eddac4da1a59da039ead586950a"},{"fixed":"d0c68045b8b0f3737ed7bd6b8c83b7887014adee"},{"fixed":"3079517a5ba80901fe828a06998da64b9b8749be"},{"fixed":"6a909ea83f226803ea0e718f6e88613df9234d58"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"24cd31752f47699b89b4b3471155c8e599a1a23a"},{"last_affected":"e9cb474de7ff7a970c2a3951c12ec7e3113c0c35"},{"last_affected":"6ab671191f64b0da7d547e2ad4dc199ca7e5b558"},{"last_affected":"3d9281a4ac7171c808f9507f0937eb236b353905"},{"last_affected":"0b641b25870f02e2423e494365fc5243cc1e2759"},{"last_affected":"ffd51dbfd2900e50c71b5c069fe407957e52d61f"},{"last_affected":"cdd107d7f18158d966c2bc136204fe826dac445c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39683.json"}}],"schema_version":"1.7.5"}