{"id":"CVE-2026-99235","revision":"b863753cff4c4a2ab2a9a3fddaeaf20d","records":[{"revision":"b863753cff4c4a2ab2a9a3fddaeaf20d","observedAt":"2026-11-02T17:57:17.012+00:00","statement":{"source":"cve-program","id":"CVE-2026-99235","aliases":[],"title":"tracing: Save the event file instead of the compatible histogram","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Save the event file instead of the compatible histogram\n\ncreate_field_var_hist() creates a histogram on the matched event to\nsupply a field variable, and records it on the target so it can be torn\ndown later:\n\n\thist_data = find_compatible_hist(target_hist_data, file);\n\t...\n\t/* Save the compatible histogram information */\n\tvar_hist->hist_data = hist_data;\n\nhist_data is not the histogram it creates. It is one that was already\nthere, whose keys the new one copies. The saved pointer has a single\nuser, unregister_field_var_hists(), which runs when the target is\nremoved:\n\n\tfile = hist_data->field_var_hists[i]->hist_data->event_file;\n\nfind_compatible_hist() matches on keys alone, so it can pick one with no\nvariables of its own. check_var_refs() then returns false and the user\ncan remove it while the target still points at it:\n\n BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320\n Read of size 8 at addr ffff8880093b90e0 by task init/1\n\n Freed by task 1:\n  kfree+0x154/0x420\n  event_hist_trigger_free+0x1d5/0x320\n  event_hist_trigger_parse+0x35f3/0x69e0\n  trigger_process_regex+0x1a6/0x250\n\nSave the event file instead. It is all the dereference ever wanted, and\nit does not go away when the user removes a trigger.","state":0,"publishedAt":"2026-11-02T16:06:41.51+00:00","modifiedAt":"2026-11-02T16:06:41.51+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"a6165126b1a1b26342b55be6eb6ee23af8756aba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"173914501b97236d7ea7dc2af7f30feddd4e1436\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"ac815a379644b2ad5008a009a3516ada31b5dd82\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"8b307d64a60548e4a74cb746f74d7ed4bd49965e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"7a111ba0d1b74c99bc8f096565dc71945f694254\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"9631dbccd3c649b567a5aafffea6b00634183997\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"02205a6752f223779a1b0e9e8ffacbea6e717851\",\n                            \"lessThan\": \"7cafc82e6153f05a221be678cd649d02e06ba909\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.273\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.224\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.191\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.161\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.115\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.60\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.14\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3.1\",\n                            \"lessThanOrEqual\": \"7.3.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba","https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436","https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82","https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e","https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254","https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea","https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997","https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99235","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99235","identifiers":["CVE-2026-99235"]},"retained":false,"historicalAffected":[]}],"coverage":[]}