{"id":"CVE-2026-93817","state":"PUBLISHED","title":"perf: Fix addr_filter_ranges lifetime","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix addr_filter_ranges lifetime\n\nLee Jia Jie reported that since event::addr_filter_ranges is used\nunder RCU, it should be RCU freed.","publishedAt":"2026-09-24T16:02:54.039Z","updatedAt":"2026-10-30T12:36:49.221Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"1d8e1e99b063de4179cc8af14d08115d74a37abf","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"6f1853b2b9f38f1343790bae8c0601b3f7554754","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"e62d4192e593630f355094adc467058a05bdc935","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":["https://git.kernel.org/stable/c/a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6","https://git.kernel.org/stable/c/1d8e1e99b063de4179cc8af14d08115d74a37abf","https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1","https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754","https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93817.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93817","state":"PUBLISHED","datePublished":"2026-09-24T16:02:54.039Z","dateUpdated":"2026-10-30T12:36:49.221Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-18T17:59:28.791Z"},"containers":{"cna":{"title":"perf: Fix addr_filter_ranges lifetime","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix addr_filter_ranges lifetime\n\nLee Jia Jie reported that since event::addr_filter_ranges is used\nunder RCU, it should be RCU freed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"1d8e1e99b063de4179cc8af14d08115d74a37abf","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"6f1853b2b9f38f1343790bae8c0601b3f7554754","versionType":"git"},{"version":"375637bc524952f1122ea22caf5a8f1fecad8228","status":"affected","lessThan":"e62d4192e593630f355094adc467058a05bdc935","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6"},{"url":"https://git.kernel.org/stable/c/1d8e1e99b063de4179cc8af14d08115d74a37abf"},{"url":"https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1"},{"url":"https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754"},{"url":"https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The buggy kfree of event->addr_filter_ranges is in __free_event(), reached from close(2) via perf_release() → perf_event_release_kernel() → put_event() → _free_event(). The concurrent use is a local mmap(2)/exec that hits perf_event_mmap()/perf_event_exec() → perf_iterate_ctx(). No remote protocol supplies the triggering state.\nAC:L - The attacker sets attr.inherit, opens an intel_pt/cs_etm event, issues PERF_EVENT_IOC_SET_FILTER, then forks/clones. close() on the parent fd kfree's the child's addr_filter_ranges in __free_event() while the child mmap()s a VM_EXEC mapping so __perf_addr_filters_adjust() writes the freed array. Both sides are attacker-driven.\nPR:L - Default perf_event_paranoid=2 still allows an unprivileged per-task intel_pt or cs_etm event with exclude_kernel set; pt_event_init() and etm_event_init() have no capable() check, and find_get_context() calls perf_allow_cpu() only for pid==-1. PERF_EVENT_IOC_SET_FILTER is then ioctl'd on that fd via perf_ioctl().\nUI:N - The attacker performs sys_perf_event_open(), PERF_EVENT_IOC_SET_FILTER, fork/clone, mmap() of the filtered file, and close() entirely in tasks they control. No separate victim must mount a filesystem or open a file.\nS:U - The defect is a host-kernel heap UAF of event->addr_filter_ranges in kernel/events/core.c. Impact stays inside the kernel's own security authority and is not a KVM/Xen guest-to-host escape or IOMMU/DMA bypass.\nC:H - __free_event() kfree's the kcalloc'd addr_filter_ranges array while RCU walkers still hold the event. Reclaiming that heap object, combined with pt_event_addr_filters_sync()/etm_addr_filters_sync() reading fr[range].start/size, yields a kernel read primitive.\nI:H - __perf_addr_filters_adjust() and perf_event_addr_filters_exec() write attacker-influenced vma start/size into the already-freed addr_filter_ranges slots. That heap UAF write is sprayable into a control-flow hijack / arbitrary write.\nA:H - Use-after-free of addr_filter_ranges while perf_iterate_ctx() still observes the event on ctx->event_list causes a kernel oops or panic when the freed slots are indexed or the reallocated object is corrupted."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:36:49.221Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}