CVE-2026-31528 (GCVE-0-2026-31528)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-10-19 18:45
VLAI
Title
perf: Make sure to use pmu_ctx->pmu for groups
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Make sure to use pmu_ctx->pmu for groups Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access when group_sched_in() fails and needs to roll back. This *should* be handled by the transaction callbacks, but he found that when the group leader is a software event, the transaction handlers of the wrong PMU are used. Despite the move_group case in perf_event_open() and group_sched_in() using pmu_ctx->pmu. Turns out, inherit uses event->pmu to clone the events, effectively undoing the move_group case for all inherited contexts. Fix this by also making inherit use pmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context. Similarly, __perf_event_read() should use equally use pmu_ctx->pmu for the group case.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:10 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd27568117664b8b3e259721393df420ed51f57b , < 656f35b463995bee024d948440128230aacd81e1 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 3a696e84a8b1fafdd774bb30d62919faf844d9e4 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 35f7914e54fe7f13654c22ee045b05e4b6d8062b (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4c759446046500a1a6785b25725725c3ff087ace (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4b9ce671960627b2505b3f64742544ae9801df97 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf: Make sure to use pmu_ctx-\u003epmu for groups",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31528.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-31528",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:10:38.614462Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-787",
                    "description": "CWE-787 Out-of-bounds Write",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:10:39.190Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "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": [
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                  "status": "affected",
                  "version": "bd27568117664b8b3e259721393df420ed51f57b",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "bd27568117664b8b3e259721393df420ed51f57b",
                  "versionType": "git"
                },
                {
                  "lessThan": "35f7914e54fe7f13654c22ee045b05e4b6d8062b",
                  "status": "affected",
                  "version": "bd27568117664b8b3e259721393df420ed51f57b",
                  "versionType": "git"
                },
                {
                  "lessThan": "4c759446046500a1a6785b25725725c3ff087ace",
                  "status": "affected",
                  "version": "bd27568117664b8b3e259721393df420ed51f57b",
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                },
                {
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                  "status": "affected",
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            },
            {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.2"
                },
                {
                  "lessThan": "6.2",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.131",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.80",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.21",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.19.*",
                  "status": "unaffected",
                  "version": "6.19.11",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.131",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.80",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.21",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19.11",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx-\u003epmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx-\u003epmu.\n\nTurns out, inherit uses event-\u003epmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx-\u003epmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx-\u003epmu for the\ngroup case."
            }
          ],
          "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 vulnerable perf group/inheritance paths are reached through the local perf_event_open syscall and subsequent fork/scheduling/read operations, not by network or physical input.\nAC:L - An attacker controls the perf event group composition, inherit flag, fork, and can create an over-constrained hardware group to force group_sched_in rollback; no uncontrollable race is required.\nPR:L - A normal unprivileged local user can create per-process user-space perf events under the default perf_event_paranoid=2 policy by excluding kernel profiling, so real administrative privileges are not required.\nUI:N - The attacker can trigger the sequence entirely from their own process using perf_event_open and fork/read/scheduling activity without any victim action.\nS:U - The bug corrupts kernel perf/PMU bookkeeping within the same kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The reported out-of-bounds access occurs in kernel PMU bookkeeping and includes memory corruption in per-CPU structures; per the higher-severity rule, this can reasonably be leveraged for kernel information disclosure.\nI:H - The rollback path can drive x86_pmu_del with inconsistent PMU transaction state, causing out-of-bounds writes such as invalid PMU array/bitmap updates, which is kernel memory corruption with potential control-flow or privilege impact.\nA:H - Even without full exploitation, the out-of-bounds kernel access can reliably produce a kernel warning/oops/panic or corrupt PMU state, causing high availability impact."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:23:18.524Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"
            },
            {
              "url": "https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"
            },
            {
              "url": "https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"
            },
            {
              "url": "https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"
            },
            {
              "url": "https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"
            }
          ],
          "title": "perf: Make sure to use pmu_ctx-\u003epmu for groups",
          "x_generator": {
            "engine": "bippy-1.2.0"
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-31528",
        "datePublished": "2026-04-22T13:54:41.180Z",
        "dateReserved": "2026-03-09T15:48:24.111Z",
        "dateUpdated": "2026-10-19T18:45:55.081Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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