{ "affected": [ { "ranges": [ { "events": [ { "introduced": "5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77" }, { "fixed": "441aa6742dff70297b5f64533a07a6189a026e91" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "43b254d46c740bf9dbe65709afa021dd726dfa99" }, { "fixed": "3a8534664426c071c2dfb5b4ffa36b18a2abfd79" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "435d2964af815aae456db554c62963b4515f19d0" }, { "fixed": "477d762be4b0ffaf01429ccd88859e93b0ec28cc" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e" }, { "fixed": "b1a49c22de01faf176d44e5caa765e237353a579" }, { "fixed": "83d1ae0406d8eade219a81b401e201702dd9dc55" }, { "fixed": "a7318172aa332a161fb9618286e64454c827f8fd" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "0" }, { "last_affected": "f1ae50cfb818ce1ac7a674406dfadb7653e2552d" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.1.130" }, { "fixed": "6.1.188" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.6.81" }, { "fixed": "6.6.157" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.12.18" }, { "fixed": "6.12.109" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.13.6" }, { "fixed": "6.14" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "6.1.188" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.2.0" }, { "fixed": "6.6.157" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.7.0" }, { "fixed": "6.12.109" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.13.0" }, { "fixed": "6.18.50" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.14.0" }, { "fixed": "7.2.4" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89746.json" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix use-after-free with same-name named triggers\n\nWhen two hist triggers on different events are registered with the same\nname=, the second one reuses the first as named_data. Both are added to\ntr-\u003ehist_vars by save_hist_vars() during event_hist_trigger_parse(),\nbecause save_hist_vars() is called before event_trigger_register() while\nthe named reuse is only detected later, in hist_register_trigger().\n\nIn the named-data branch hist_register_trigger() then frees the second\nhistogram's hist_data via destroy_hist_data(), but never removes its\ntr-\u003ehist_vars list entry, leaving a dangling pointer and leaking the\ntrace_array reference it holds.\n\nA later hist trigger that references a variable makes find_var_file()\nwalk tr-\u003ehist_vars and dereference the freed hist_data. The bug is\nreproducible from userspace by writing three hist triggers to tracefs:\n\n cd /sys/kernel/tracing\n echo 'hist:keys=common_pid:x=common_pid:name=mh' \u003e events/sched/sched_switch/trigger\n echo 'hist:keys=common_pid:x=common_pid:name=mh' \u003e events/sched/sched_process_fork/trigger\n echo 'hist:keys=common_pid:vals=$x' \u003e events/sched/sched_process_exit/trigger\n\nThe third write panics the kernel:\n\n BUG: KASAN: slab-use-after-free in find_var_file.part.0+0x272/0x290\n Read of size 8 at addr ffff888001f8a0e0 by task sh/1\n CPU: 1 UID: 0 PID: 1 Comm: sh Tainted: G D N\n Call Trace:\n find_var_file.part.0\n find_event_var\n parse_atom\n parse_expr\n __create_val_field\n event_hist_trigger_parse\n trigger_process_regex\n event_trigger_write\n vfs_write\n ksys_write\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Allocated by task 1:\n event_hist_trigger_parse\n Freed by task 1:\n hist_register_trigger+0x618/0xa30\n event_hist_trigger_parse\n The buggy address belongs to freed 2048-byte region\n Oops: general protection fault ... RIP: find_var_file.part.0\n Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n\nFix by removing the hist_data from tr-\u003ehist_vars and releasing the\ntrace_array reference in the named-data branch of hist_register_trigger()\nbefore freeing the hist_data.", "id": "CVE-2026-89746", "modified": "2026-09-15T03:30:40.318711416Z", "published": "2026-09-11T19:46:51.529Z", "references": [ { "type": "WEB", "url": "https://git.kernel.org/stable/c/3a8534664426c071c2dfb5b4ffa36b18a2abfd79" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/441aa6742dff70297b5f64533a07a6189a026e91" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/477d762be4b0ffaf01429ccd88859e93b0ec28cc" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/83d1ae0406d8eade219a81b401e201702dd9dc55" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/a7318172aa332a161fb9618286e64454c827f8fd" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/b1a49c22de01faf176d44e5caa765e237353a579" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89746.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89746" }, { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" } ], "schema_version": "1.9.0", "severity": [ { "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "type": "CVSS_V3" } ], "summary": "tracing: Fix use-after-free with same-name named triggers" }