CVE-2026-93817 (GCVE-0-2026-93817)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-21 12:52
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Fix addr_filter_ranges lifetime Lee Jia Jie reported that since event::addr_filter_ranges is used under RCU, it should be RCU freed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 375637bc524952f1122ea22caf5a8f1fecad8228
Version: 375637bc524952f1122ea22caf5a8f1fecad8228
Version: 375637bc524952f1122ea22caf5a8f1fecad8228
Version: 375637bc524952f1122ea22caf5a8f1fecad8228
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": "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": "6.6.*",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The buggy kfree of event-\u003eaddr_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\u0027s the child\u0027s 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\u0027d 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-\u003eaddr_filter_ranges in kernel/events/core.c. Impact stays inside the kernel\u0027s own security authority and is not a KVM/Xen guest-to-host escape or IOMMU/DMA bypass.\nC:H - __free_event() kfree\u0027s the kcalloc\u0027d 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-\u003eevent_list causes a kernel oops or panic when the freed slots are indexed or the reallocated object is corrupted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:52:40.858Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93817",
    "datePublished": "2026-09-24T16:02:54.039Z",
    "dateReserved": "2026-09-18T17:59:28.791Z",
    "dateUpdated": "2026-10-21T12:52:40.858Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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