{"id":"CVE-2026-99235","summary":"tracing: Save the event file instead of the compatible histogram","details":"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-\u003ehist_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-\u003efield_var_hists[i]-\u003ehist_data-\u003eevent_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.","modified":"2026-11-10T17:27:01.362237135Z","published":"2026-11-02T16:06:41.510Z","related":["openSUSE-SU-2026:12497-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99235.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5c42664fc094899af9aae5300b27fe8fdb658ef"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99235.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99235"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"02205a6752f223779a1b0e9e8ffacbea6e717851"},{"fixed":"a6165126b1a1b26342b55be6eb6ee23af8756aba"},{"fixed":"173914501b97236d7ea7dc2af7f30feddd4e1436"},{"fixed":"ac815a379644b2ad5008a009a3516ada31b5dd82"},{"fixed":"8b307d64a60548e4a74cb746f74d7ed4bd49965e"},{"fixed":"7a111ba0d1b74c99bc8f096565dc71945f694254"},{"fixed":"3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea"},{"fixed":"9631dbccd3c649b567a5aafffea6b00634183997"},{"fixed":"7cafc82e6153f05a221be678cd649d02e06ba909"},{"fixed":"d5c42664fc094899af9aae5300b27fe8fdb658ef"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99235.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.161"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.115"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.60"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.3.0"},{"fixed":"7.3.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99235.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}