{"id":"CVE-2026-99233","published":"2026-11-02T16:17:48.390","lastModified":"2026-11-02T16:17:48.390","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/histograms: Verify event_call identity when updating synth_event refcount\n\nIn event_hist_trigger_parse() and hist_unreg_all(), the histogram\nregistration and unregistration paths look up find_synth_event() using\ntrace_event_name(file->event_call) and adjust se->ref if a match is\nfound.\n\nBecause find_synth_event() only compares the event basename, registering\nor removing a histogram on a non-synthetic trace event whose basename\nmatches a synthetic event erroneously modifies the synthetic event's\nreference count.  If a histogram is registered on the non-synthetic\nevent before the synthetic event is created and removed afterwards,\nse->ref is decremented without a matching increment, allowing the\nsynthetic event to be freed while an active histogram action still holds\na pointer to it.\n\nIntroduce find_synth_event_call() to verify that &se->call matches\nfile->event_call before adjusting se->ref.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb","tags":[]},{"url":"https://git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b","tags":[]},{"url":"https://git.kernel.org/stable/c/381f543ed35c434d5b707369aa5dcd69ecf440af","tags":[]},{"url":"https://git.kernel.org/stable/c/4472579bd1c83708b6fe623c870cdf728e947205","tags":[]},{"url":"https://git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c","tags":[]},{"url":"https://git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}