Vulnerability-Lookup

FKIE_CVE-2026-74606

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

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: 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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/tracefs/event_inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b77581b25e213e83b79ce11eb30024e55ceeb3e9",
              "status": "affected",
              "version": "5dfb04100326f70e3b2d2872c2476ed20b804837",
              "versionType": "git"
            },
            {
              "lessThan": "f161d7861a0bfdf10af6b738b3b57636204661fb",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "5635211b44969f4816e29ec4d5f8665fb39535d0",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "74bb1eaf72d185a78c879eb2678ea500f82f46a8",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "fd73b691702170d37d66f4b0278530cea8ed419a",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5a43badefe0eccca0c26144c0a44b8d417ce8103",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.152",
              "status": "affected",
              "version": "6.6.18",
              "versionType": "semver"
            },
            {
              "lessThan": "6.8",
              "status": "affected",
              "version": "6.7.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/tracefs/event_inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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\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."
    }
  ],
  "id": "CVE-2026-74606",
  "lastModified": "2026-08-25T06:18:37.160",
  "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": "2026-08-22T16:16:33.077",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40

Title

eventfs: Fix use-after-free in eventfs_remove_rec()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/b77581b25e213e83b…
https://git.kernel.org/stable/c/f161d7861a0bfdf10…
https://git.kernel.org/stable/c/5635211b44969f481…
https://git.kernel.org/stable/c/74bb1eaf72d185a78…
https://git.kernel.org/stable/c/fd73b691702170d37…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/tracefs/event_inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b77581b25e213e83b79ce11eb30024e55ceeb3e9",
              "status": "affected",
              "version": "5dfb04100326f70e3b2d2872c2476ed20b804837",
              "versionType": "git"
            },
            {
              "lessThan": "f161d7861a0bfdf10af6b738b3b57636204661fb",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "5635211b44969f4816e29ec4d5f8665fb39535d0",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "74bb1eaf72d185a78c879eb2678ea500f82f46a8",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "lessThan": "fd73b691702170d37d66f4b0278530cea8ed419a",
              "status": "affected",
              "version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5a43badefe0eccca0c26144c0a44b8d417ce8103",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.152",
              "status": "affected",
              "version": "6.6.18",
              "versionType": "semver"
            },
            {
              "lessThan": "6.8",
              "status": "affected",
              "version": "6.7.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/tracefs/event_inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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": "6.6.152",
                  "versionStartIncluding": "6.6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.7.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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 - 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:31.060Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a"
        }
      ],
      "title": "eventfs: Fix use-after-free in eventfs_remove_rec()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-74606

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

Tags

Sightings

Nomenclature