{ "cveId": "CVE-2026-97921", "url": "https://patchblox.com/security/cve/CVE-2026-97921", "summary": "CVE-2026-97921 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-97921, released September 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "tracing: Free histogram the field rejected for a bad modifier", "description": "In the Linux kernel, the following vulnerability has been resolved: tracing: Free histogram the field rejected for a bad modifier Writing a hist trigger whose value or variable carries a modifier that is not allowed there leaks the fields that were built for it. __create_val_field() takes the field from parse_expr() and stores it in hist_data-\u003Efields[] only after the modifier checks have run: \thist_field = parse_expr(hist_data, file, field_str, flags, var_name, \t\t\t\t\u0026n_subexprs); \t... \tif (hist_field-\u003Eflags \u0026 HIST_FIELD_FL_VAR) { \t\tif (hist_field-\u003Eflags \u0026 (...)) \t\t\tgoto err; \t} else { \t\tif (hist_field-\u003Eflags \u0026 (...)) \t\t\tgoto err; \t} \thist_data-\u003Efields[val_idx] = hist_field; Both checks jump past that store, and the err label returns without freeing anything. The error unwinds to create_hist_data(), which calls destroy_hist_data() -\u003E destroy_hist_fields(), and that reaches a field only by walking fields[]. A field that never got there is unreachable. commit e0213434fe3e (\u0022tracing: Do not let histogram values have some modifiers\u0022) set ret to -EINVAL and fell through to the store, which left the field owned by fields[] and freed along with the rest of hist_data. Splitting the check into a value case and a variable case replaced that fall-through with a goto that skips it. With CONFIG_DEBUG_KMEMLEAK, 200 writes of # echo \u0027hist:keys=prev_pid:vals=next_pid.log2\u0027 \u003E \\ \t events/sched/sched_switch/trigger each correctly rejected with -EINVAL, leave 332 unreferenced objects (63744 bytes) reported at create_hist_field(); 200 install and remove cycles of a valid trigger leave none. A \u0027.log2\u0027 field is two allocations, since create_hist_field() puts the plain field in operands[0] of the log2 field, and both are reported. Use destroy_hist_field() rather than __destroy_hist_field() so that operands[0] is freed as well. It returns early for HIST_FIELD_FL_VAR_REF, which is what an operand owned by hist_data-\u003Evar_refs[] needs; the rejected field itself is never a var ref, because a var ref never carries a modifier flag.", "published": "2026-09-25T11:17:19Z", "severity": "Moderate", "cvss": 5.5, "epss": 0.00211, "epssPercentile": 0.11428, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97921", "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": "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-core", "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-core", "release": "ol 9", "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-debug", "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-debug", "release": "ol 9", "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-debug-core", "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-debug-core", "release": "ol 9", "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-debug-devel", "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-debug-devel", "release": "ol 9", "fixedVersion": 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