CVE-2026-74606 (GCVE-0-2026-74606)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
eventfs: Fix use-after-free in eventfs_remove_rec()
Summary
In the Linux kernel, the following vulnerability has been resolved: eventfs: Fix use-after-free in eventfs_remove_rec() eventfs_remove_rec() recursively removes the child at the current loop position. After the recursive call returns, list_for_each_entry() advances by reading list.next from the removed child. If free_ei() drops the final reference, release_ei() reuses the list/rcu union to queue an SRCU callback. The child may be freed before that read. The eventfs_mutex serializes list updates, but it does not keep the removed child alive or prevent the SRCU callback from running. Use list_for_each_entry_safe() to save the next sibling before recursively removing the current child.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5dfb04100326f70e3b2d2872c2476ed20b804837 , < b77581b25e213e83b79ce11eb30024e55ceeb3e9 (git)
Affected: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb , < f161d7861a0bfdf10af6b738b3b57636204661fb (git)
Affected: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb , < 5635211b44969f4816e29ec4d5f8665fb39535d0 (git)
Affected: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb , < 74bb1eaf72d185a78c879eb2678ea500f82f46a8 (git)
Affected: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb , < fd73b691702170d37d66f4b0278530cea8ed419a (git)
Affected: 5a43badefe0eccca0c26144c0a44b8d417ce8103 (git)
Affected: 6.6.18 , < 6.6.152 (semver)
Affected: 6.7.6 , < 6.8 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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              "status": "unaffected",
              "version": "6.12.104",
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              "version": "7.1.9",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Fix use-after-free in eventfs_remove_rec()\n\neventfs_remove_rec() recursively removes the child at the current loop\nposition. After the recursive call returns, list_for_each_entry() advances\nby reading list.next from the removed child.\n\nIf free_ei() drops the final reference, release_ei() reuses the list/rcu\nunion to queue an SRCU callback. The child may be freed before that read.\nThe eventfs_mutex serializes list updates, but it does not keep the removed\nchild alive or prevent the SRCU callback from running.\n\nUse list_for_each_entry_safe() to save the next sibling before recursively\nremoving the current child."
        }
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              "value": "AV:L - eventfs_remove_rec() is only reached via eventfs_remove_dir()/eventfs_remove_events_dir() during tracefs event teardown (instance rmdir, dynamic event removal, module unload); tracefs is a local pseudo-fs under /sys/kernel/tracing with no network, adjacent, or physical entry path.\nAC:L - The UAF is deterministic whenever a parent eventfs_inode has 2+ children: after recursively freeing the first child, list_for_each_entry() reads list.next from repurposed freed memory; an attacker can create multiple trace events then trigger parent teardown without uncontrollable races.\nPR:L - Exploitation needs local tracefs write (kprobe_events/dynamic_events to create events, rmdir on tracing instances); paths check LOCKDOWN_TRACEFS and DAC without capable(), and tracing-group gid mounts on Android/ChromeOS/dev systems commonly grant this to unprivileged users.\nUI:N - The attacker performs all tracefs operations to create multiple eventfs children and invoke teardown in their own session; no separate victim mount, click, or configuration action is required beyond tracefs already being accessible.\nS:U - The UAF corrupts kernel heap within the tracing/eventfs subsystem on the same host; it enables local privilege escalation but does not cross VM, IOMMU, container, or other security boundaries to a different authority.\nC:H - After free_ei(), release_ei() reuses the child\u0027s list/rcu union for SRCU teardown; list_for_each_entry() then reads list.next from freed/repurposed eventfs_inode memory, a standard kernel UAF read and information-disclosure primitive.\nI:H - Freed eventfs_inode slabs can be attacker-influenced via repeated trace-event create/delete; the corrupt sibling traversal enables heap grooming for arbitrary kernel writes and local privilege escalation, not merely a bounded crash.\nA:H - Reading list.next from a freed/repurposed eventfs_inode during recursive removal reliably causes invalid pointer dereferences, kernel oops, or panic; the fault is retriggerable by repeating trace-event setup and teardown cycles."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74606",
    "datePublished": "2026-08-22T15:31:53.819Z",
    "dateReserved": "2026-08-15T05:44:03.920Z",
    "dateUpdated": "2026-08-25T05:40:31.060Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-08-29",
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    },
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      "cve": "CVE-2026-74606",
      "id": "msrc_CVE-2026-74606",
      "initial_release_date": "2026-08-24T01:09:24.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "eventfs: Fix use-after-free in eventfs_remove_rec()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74606.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74606\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:33.077\",\"lastModified\":\"2026-08-25T06:18:37.160\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\neventfs: Fix use-after-free in eventfs_remove_rec()\\n\\neventfs_remove_rec() recursively removes the child at the current loop\\nposition. After the recursive call returns, list_for_each_entry() advances\\nby reading list.next from the removed child.\\n\\nIf free_ei() drops the final reference, release_ei() reuses the list/rcu\\nunion to queue an SRCU callback. The child may be freed before that read.\\nThe eventfs_mutex serializes list updates, but it does not keep the removed\\nchild alive or prevent the SRCU callback from running.\\n\\nUse list_for_each_entry_safe() to save the next sibling before recursively\\nremoving the current child.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/tracefs/event_inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5dfb04100326f70e3b2d2872c2476ed20b804837\",\"lessThan\":\"b77581b25e213e83b79ce11eb30024e55ceeb3e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"43aa6f97c2d03a52c1ddb86768575fc84344bdbb\",\"lessThan\":\"f161d7861a0bfdf10af6b738b3b57636204661fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"43aa6f97c2d03a52c1ddb86768575fc84344bdbb\",\"lessThan\":\"5635211b44969f4816e29ec4d5f8665fb39535d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"43aa6f97c2d03a52c1ddb86768575fc84344bdbb\",\"lessThan\":\"74bb1eaf72d185a78c879eb2678ea500f82f46a8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"43aa6f97c2d03a52c1ddb86768575fc84344bdbb\",\"lessThan\":\"fd73b691702170d37d66f4b0278530cea8ed419a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a43badefe0eccca0c26144c0a44b8d417ce8103\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.6.18\",\"lessThan\":\"6.6.152\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.7.6\",\"lessThan\":\"6.8\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/tracefs/event_inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:50:33+00:00",
      "cve": "CVE-2026-74606",
      "id": "CVE-2026-74606",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: eventfs: Fix use-after-free in eventfs_remove_rec()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74606.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.