{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31528",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31528"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "perf: Make sure to use pmu_ctx->pmu for groups",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx->pmu 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->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31528"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"
    },
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      "url": "https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"
    },
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      "url": "https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"
    },
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      "url": "https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"
    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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."
    }
  }
}