{ "cveId": "CVE-2026-89746", "url": "https://patchblox.com/security/cve/CVE-2026-89746", "summary": "CVE-2026-89746 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-89746, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "tracing: Fix use-after-free with same-name named triggers", "description": "In the Linux kernel, the following vulnerability has been resolved: tracing: Fix use-after-free with same-name named triggers When two hist triggers on different events are registered with the same name=, the second one reuses the first as named_data. Both are added to tr-\u003Ehist_vars by save_hist_vars() during event_hist_trigger_parse(), because save_hist_vars() is called before event_trigger_register() while the named reuse is only detected later, in hist_register_trigger(). In the named-data branch hist_register_trigger() then frees the second histogram\u0027s hist_data via destroy_hist_data(), but never removes its tr-\u003Ehist_vars list entry, leaving a dangling pointer and leaking the trace_array reference it holds. A later hist trigger that references a variable makes find_var_file() walk tr-\u003Ehist_vars and dereference the freed hist_data. The bug is reproducible from userspace by writing three hist triggers to tracefs: cd /sys/kernel/tracing echo \u0027hist:keys=common_pid:x=common_pid:name=mh\u0027 \u003E events/sched/sched_switch/trigger echo \u0027hist:keys=common_pid:x=common_pid:name=mh\u0027 \u003E events/sched/sched_process_fork/trigger echo \u0027hist:keys=common_pid:vals=$x\u0027 \u003E events/sched/sched_process_exit/trigger The third write panics the kernel: BUG: KASAN: slab-use-after-free in find_var_file.part.0\u002B0x272/0x290 Read of size 8 at addr ffff888001f8a0e0 by task sh/1 CPU: 1 UID: 0 PID: 1 Comm: sh Tainted: G D N Call Trace: find_var_file.part.0 find_event_var parse_atom parse_expr __create_val_field event_hist_trigger_parse trigger_process_regex event_trigger_write vfs_write ksys_write do_syscall_64 entry_SYSCALL_64_after_hwframe Allocated by task 1: event_hist_trigger_parse Freed by task 1: hist_register_trigger\u002B0x618/0xa30 event_hist_trigger_parse The buggy address belongs to freed 2048-byte region Oops: general protection fault ... RIP: find_var_file.part.0 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Fix by removing the hist_data from tr-\u003Ehist_vars and releasing the trace_array reference in the named-data branch of hist_register_trigger() before freeing the hist_data.", "published": "2026-09-11T20:20:05Z", "severity": "Moderate", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00164, "epssPercentile": 0.0563, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89746", "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": 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