CVE-2026-74753

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: perf: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events. A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event. Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment. [peterz: make the earlier test fully consistent]

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-08-26 15:16:54.387000

Last modified

2026-10-30 13:20:05.880000

View original CVE JSON

{
  "id": "CVE-2026-74753",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-26T15:16:54.387",
  "lastModified": "2026-10-30T13:20:05.880",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Reject exited events as group leaders\n\nperf_event_remove_on_exec() sets remove-on-exec events to the EXIT state\nand detaches their group relationships.  The event's file descriptor can\nremain open, however, and perf_event_open() currently accepts that event\nas a group leader because its early validation rejects only REVOKED and\nDEAD events.\n\nA new sibling can consequently be linked to the detached leader.  When\nthe leader is closed, perf_group_detach() observes that its\nPERF_ATTACH_GROUP bit is already clear and skips the new sibling.  The\nsibling then retains a group_leader pointer to the freed event.\n\nReject group leaders in the EXIT state.  Perform the check while holding\nthe shared context mutex so that an exec in the target task cannot detach\nthe leader between validation and group attachment.\n\n[peterz: make the earlier test fully consistent]"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2",
              "lessThan": "ce12e1170c0c78dffb9b28af6d287492ae7dd99d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "39358e856fb89e62e3c8d7389a2dc4ec33dbe90e",
              "lessThan": "e593031ff19a9484e8a00bc47edd447187721846",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "a2d5d3ee7b6e3953114726b1521e62123ab5b043",
              "lessThan": "7a03413f31c196ab3894f988cdce0bb47b4fec42",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "06ccef0434e98058ddae7bcebc901f93d22b7653",
              "lessThan": "7ce010275c531475f9d6e7efb11b9e522c74ed2e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "037a3c43edfb597665dd34457cd22b14692f2ba3",
              "lessThan": "fa091f46c3833fb22384f10eade2b4e1e1d0b278",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1d3e1102273f09180262496658e7eeed8a5a7b59",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.1.191",
              "lessThan": "6.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.6.145",
              "lessThan": "6.6.156",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.12.96",
              "lessThan": "6.12.108",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.18.39",
              "lessThan": "6.18.46",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "7.1.4",
              "lessThan": "7.1.10",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "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
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:16:28.986516Z",
          "id": "CVE-2026-74753",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7a03413f31c196ab3894f988cdce0bb47b4fec42",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ce010275c531475f9d6e7efb11b9e522c74ed2e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ce12e1170c0c78dffb9b28af6d287492ae7dd99d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e593031ff19a9484e8a00bc47edd447187721846",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fa091f46c3833fb22384f10eade2b4e1e1d0b278",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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}