{"id":"CVE-2024-26703","summary":"tracing/timerlat: Move hrtimer_init to timerlat_fd open()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/timerlat: Move hrtimer_init to timerlat_fd open()\n\nCurrently, the timerlat's hrtimer is initialized at the first read of\ntimerlat_fd, and destroyed at close(). It works, but it causes an error\nif the user program open() and close() the file without reading.\n\nHere's an example:\n\n # echo NO_OSNOISE_WORKLOAD \u003e /sys/kernel/debug/tracing/osnoise/options\n # echo timerlat \u003e /sys/kernel/debug/tracing/current_tracer\n\n # cat \u003c\u003cEOF \u003e ./timerlat_load.py\n # !/usr/bin/env python3\n\n timerlat_fd = open(\"/sys/kernel/tracing/osnoise/per_cpu/cpu0/timerlat_fd\", 'r')\n timerlat_fd.close();\n EOF\n\n # ./taskset -c 0 ./timerlat_load.py\n\u003cBOOM\u003e\n\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 1 PID: 2673 Comm: python3 Not tainted 6.6.13-200.fc39.x86_64 #1\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39 04/01/2014\n RIP: 0010:hrtimer_active+0xd/0x50\n Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 57 30 \u003c8b\u003e 42 10 a8 01 74 09 f3 90 8b 42 10 a8 01 75 f7 80 7f 38 00 75 1d\n RSP: 0018:ffffb031009b7e10 EFLAGS: 00010286\n RAX: 000000000002db00 RBX: ffff9118f786db08 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: ffff9117a0e64400 RDI: ffff9118f786db08\n RBP: ffff9118f786db80 R08: ffff9117a0ddd420 R09: ffff9117804d4f70\n R10: 0000000000000000 R11: 0000000000000000 R12: ffff9118f786db08\n R13: ffff91178fdd5e20 R14: ffff9117840978c0 R15: 0000000000000000\n FS:  00007f2ffbab1740(0000) GS:ffff9118f7840000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000010 CR3: 00000001b402e000 CR4: 0000000000750ee0\n PKRU: 55555554\n Call Trace:\n  \u003cTASK\u003e\n  ? __die+0x23/0x70\n  ? page_fault_oops+0x171/0x4e0\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? avc_has_extended_perms+0x237/0x520\n  ? exc_page_fault+0x7f/0x180\n  ? asm_exc_page_fault+0x26/0x30\n  ? hrtimer_active+0xd/0x50\n  hrtimer_cancel+0x15/0x40\n  timerlat_fd_release+0x48/0xe0\n  __fput+0xf5/0x290\n  __x64_sys_close+0x3d/0x80\n  do_syscall_64+0x60/0x90\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? __x64_sys_ioctl+0x72/0xd0\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? syscall_exit_to_user_mode+0x2b/0x40\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? do_syscall_64+0x6c/0x90\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? exit_to_user_mode_prepare+0x142/0x1f0\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? syscall_exit_to_user_mode+0x2b/0x40\n  ? srso_alias_return_thunk+0x5/0x7f\n  ? do_syscall_64+0x6c/0x90\n  entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n RIP: 0033:0x7f2ffb321594\n Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 80 3d d5 cd 0d 00 00 74 13 b8 03 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 3c c3 0f 1f 00 55 48 89 e5 48 83 ec 10 89 7d\n RSP: 002b:00007ffe8d8eef18 EFLAGS: 00000202 ORIG_RAX: 0000000000000003\n RAX: ffffffffffffffda RBX: 00007f2ffba4e668 RCX: 00007f2ffb321594\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n RBP: 00007ffe8d8eef40 R08: 0000000000000000 R09: 0000000000000000\n R10: 55c926e3167eae79 R11: 0000000000000202 R12: 0000000000000003\n R13: 00007ffe8d8ef030 R14: 0000000000000000 R15: 00007f2ffba4e668\n  \u003c/TASK\u003e\n CR2: 0000000000000010\n ---[ end trace 0000000000000000 ]---\n\nMove hrtimer_init to timerlat_fd open() to avoid this problem.","modified":"2026-03-20T12:35:09.036077Z","published":"2024-04-03T14:55:01.838Z","related":["SUSE-SU-2024:4314-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26703.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1389358bb008e7625942846e9f03554319b7fecc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2354d29986ebd138f89c2b73fecf8237e0a4ad6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f703935fdb559642d85b2088442ee55a557ae6d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26703.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26703"},{"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":"e88ed227f639ebcb31ed4e5b88756b47d904584b"},{"fixed":"5f703935fdb559642d85b2088442ee55a557ae6d"},{"fixed":"2354d29986ebd138f89c2b73fecf8237e0a4ad6b"},{"fixed":"1389358bb008e7625942846e9f03554319b7fecc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26703.json"}}],"schema_version":"1.7.5"}