{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-89746", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89746", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:46:51.529Z", "updatedAt": "2026-10-19T08:52:00.175Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "tracing: Fix use-after-free with same-name named triggers", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix use-after-free with same-name named triggers\n\nWhen two hist triggers on different events are registered with the same\nname=, the second one reuses the first as named_data. Both are added to\ntr->hist_vars by save_hist_vars() during event_hist_trigger_parse(),\nbecause save_hist_vars() is called before event_trigger_register() while\nthe named reuse is only detected later, in hist_register_trigger().\n\nIn the named-data branch hist_register_trigger() then frees the second\nhistogram's hist_data via destroy_hist_data(), but never removes its\ntr->hist_vars list entry, leaving a dangling pointer and leaking the\ntrace_array reference it holds.\n\nA later hist trigger that references a variable makes find_var_file()\nwalk tr->hist_vars and dereference the freed hist_data. The bug is\nreproducible from userspace by writing three hist triggers to tracefs:\n\n cd /sys/kernel/tracing\n echo 'hist:keys=common_pid:x=common_pid:name=mh' > events/sched/sched_switch/trigger\n echo 'hist:keys=common_pid:x=common_pid:name=mh' > events/sched/sched_process_fork/trigger\n echo 'hist:keys=common_pid:vals=$x' > events/sched/sched_process_exit/trigger\n\nThe third write panics the kernel:\n\n BUG: KASAN: slab-use-after-free in find_var_file.part.0+0x272/0x290\n Read of size 8 at addr ffff888001f8a0e0 by task sh/1\n CPU: 1 UID: 0 PID: 1 Comm: sh Tainted: G D N\n Call Trace:\n find_var_file.part.0\n find_event_var\n parse_atom\n parse_expr\n __create_val_field\n event_hist_trigger_parse\n trigger_process_regex\n event_trigger_write\n vfs_write\n ksys_write\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Allocated by task 1:\n event_hist_trigger_parse\n Freed by task 1:\n hist_register_trigger+0x618/0xa30\n event_hist_trigger_parse\n The buggy address belongs to freed 2048-byte region\n Oops: general protection fault ... RIP: find_var_file.part.0\n Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n\nFix by removing the hist_data from tr->hist_vars and releasing the\ntrace_array reference in the named-data branch of hist_register_trigger()\nbefore freeing the hist_data.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77", "status": "affected", "versionType": "git", "lessThan": "441aa6742dff70297b5f64533a07a6189a026e91" }, { "version": "43b254d46c740bf9dbe65709afa021dd726dfa99", "status": "affected", "versionType": "git", "lessThan": "3a8534664426c071c2dfb5b4ffa36b18a2abfd79" }, { "version": "435d2964af815aae456db554c62963b4515f19d0", "status": "affected", "versionType": "git", "lessThan": "477d762be4b0ffaf01429ccd88859e93b0ec28cc" }, { "version": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e", "status": "affected", "versionType": "git", "lessThan": "b1a49c22de01faf176d44e5caa765e237353a579" }, { "version": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e", "status": "affected", "versionType": "git", "lessThan": "83d1ae0406d8eade219a81b401e201702dd9dc55" }, { "version": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e", "status": "affected", "versionType": "git", "lessThan": "a7318172aa332a161fb9618286e64454c827f8fd" }, { "version": "f1ae50cfb818ce1ac7a674406dfadb7653e2552d", "status": "affected", "versionType": "git" }, { "version": "6.1.130", "status": "affected", "versionType": "semver", "lessThan": "6.1.188" }, { "version": "6.6.81", "status": "affected", "versionType": "semver", "lessThan": "6.6.157" }, { "version": "6.12.18", "status": "affected", "versionType": "semver", "lessThan": "6.12.109" }, { "version": "6.13.6", "status": "affected", "versionType": "semver", "lessThan": "6.14" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.14", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.14" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }