CVE-2026-97443

perf/ftrace: Fix WARNING in __unregister_ftrace_function

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-97443

Published

In the Linux kernel, the following vulnerability has been resolved: perf/ftrace: Fix WARNING in __unregister_ftrace_function perf_ftrace_function_unregister() unconditionally calls unregister_ftrace_function() without checking whether the ftrace_ops was ever successfully registered. This triggers a WARN_ON in __unregister_ftrace_function() when the ops doesn't have FTRACE_OPS_FL_ENABLED set. This can happen during perf_event_alloc() error cleanup when perf_trace_destroy() is called via __free_event() on an event whose ftrace_ops registration failed or was already torn down by perf_try_init_event()'s err_destroy path. The call path is: perf_event_alloc() error cleanup -> __free_event() -> event->destroy() [tp_perf_event_destroy] -> perf_trace_destroy() -> perf_trace_event_close() -> TRACE_REG_PERF_CLOSE -> perf_ftrace_function_unregister() -> unregister_ftrace_function() -> __unregister_ftrace_function() -> WARN_ON(!(ops->flags & FTRACE_OPS_FL_ENABLED)) Fix this by checking FTRACE_OPS_FL_ENABLED before attempting to unregister. If the ops is not enabled, just free the filter and return success.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-97443

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/trace/trace_event_perf.c"
                    ],
                    "versions": [
                        {
                            "version": "7ef5aa081f989ecfecc1df02068a80aebbd3ec31",
                            "lessThan": "df097713b56ffac5eed32a9be2e7d27ac48d9087",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
                            "lessThan": "7f845820afaad339341c2ae42bc7fdec175df9ea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
                            "lessThan": "9581123304b23049437324038698af9fb56ee663",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "315a50c6b1c6ce191f19f3372935d8e2ed9b53a6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1209b0b29fd472e7dbd2b06544b019dd9f9b7e51",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.12.24",
                            "lessThan": "6.12.111",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.13.12",
                            "lessThan": "6.14",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.14.3",
                            "lessThan": "6.15",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/trace/trace_event_perf.c"
                    ],
                    "versions": [
                        {
                            "version": "6.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON