CVE-2026-93817

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93817", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.791Z", "datePublished": "2026-09-24T16:02:54.039Z", "dateUpdated": "2026-10-30T12:36:49.221Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:36:49.221Z"}, "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."}], "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() \u2192 perf_event_release_kernel() \u2192 put_event() \u2192 _free_event(). The concurrent use is a local mmap(2)/exec that hits perf_event_mmap()/perf_event_exec() \u2192 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "375637bc524952f1122ea22caf5a8f1fecad8228", "lessThan": "a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6", "status": "affected", "versionType": "git"}, {"version": "375637bc524952f1122ea22caf5a8f1fecad8228", "lessThan": "1d8e1e99b063de4179cc8af14d08115d74a37abf", "status": "affected", "versionType": "git"}, {"version": "375637bc524952f1122ea22caf5a8f1fecad8228", "lessThan": "cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1", "status": "affected", "versionType": "git"}, {"version": "375637bc524952f1122ea22caf5a8f1fecad8228", "lessThan": "6f1853b2b9f38f1343790bae8c0601b3f7554754", "status": "affected", "versionType": "git"}, {"version": "375637bc524952f1122ea22caf5a8f1fecad8228", "lessThan": "e62d4192e593630f355094adc467058a05bdc935", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "4.7", "status": "affected"}, {"version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "perf: Fix addr_filter_ranges lifetime", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6", "status": "affected", "version": "375637bc524952f1122ea22caf5a8f1fecad8228", "versionType": "git"}, {"lessThan": "1d8e1e99b063de4179cc8af14d08115d74a37abf", "status": "affected", "version": "375637bc524952f1122ea22caf5a8f1fecad8228", "versionType": "git"}, {"lessThan": "cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1", "status": "affected", "version": "375637bc524952f1122ea22caf5a8f1fecad8228", "versionType": "git"}, {"lessThan": "6f1853b2b9f38f1343790bae8c0601b3f7554754", "status": "affected", "version": "375637bc524952f1122ea22caf5a8f1fecad8228", "versionType": "git"}, {"lessThan": "e62d4192e593630f355094adc467058a05bdc935", "status": "affected", "version": "375637bc524952f1122ea22caf5a8f1fecad8228", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.7"}, {"lessThan": "4.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-93817", "lastModified": "2026-10-30T13:21:03.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-24T17:17:15.233", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d8e1e99b063de4179cc8af14d08115d74a37abf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a0b1ec3a2daf4d4233fae9b5b8d657b4a5db4df6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: perf: Fix addr_filter_ranges lifetime", "id": "2540391", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540391"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nperf: Fix addr_filter_ranges lifetime\nLee Jia Jie reported that since event::addr_filter_ranges is used\nunder RCU, it should be RCU freed.", "A flaw was found in the Linux kernel's performance events (perf) subsystem. This vulnerability occurs because memory allocated for event address filters is released prematurely while still in active use by other kernel processes. A local user could exploit this use-after-free flaw during performance monitoring operations to cause a Denial of Service (DoS) through a system crash or potentially corrupt system memory."], "name": "CVE-2026-93817", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93817\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93817\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93817.mbox"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6f1853b2b9f38f1343790bae8c0601b3f7554754)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e62d4192e593630f355094adc467058a05bdc935)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-24T21:00:17.281585+00:00", "updated": "2026-10-01T20:00:12.415902+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}