CVE-2026-98477 (GCVE-0-2026-98477)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-21 12:55
VLAI
Title
perf/core: Fix NULL pmu_ctx passed to pmu->sched_task()
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix NULL pmu_ctx passed to pmu->sched_task() perf_pmu_sched_task() returns early when cpuctx->task_ctx is set, and cpc->task_epc is only non-NULL while a task context is scheduled in on this CPU. __perf_pmu_sched_task() therefore always passes NULL: Unable to handle kernel NULL pointer dereference at virtual address 00 pc : armv8pmu_sched_task+0x14/0x50 Call trace: armv8pmu_sched_task+0x14/0x50 (P) perf_pmu_sched_task+0xac/0x108 __perf_event_task_sched_out+0x6c/0xe0 Pass &cpc->epc instead, the CPU-wide context for this PMU, which the function already dereferences a few lines up to find pmu. armv8pmu_sched_task() is the only in-tree implementation that dereferences the argument, and it only reads ->pmu, so the oops needs BRBE, added in v6.17.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd27568117664b8b3e259721393df420ed51f57b , < 98181f9721f75f1a544dc563b0d8fed1d5c398d5 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < b5409311b606d536cc485f3706c242c2afa93edb (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 249a2bd87a0e57dc28f36e992807edc9cae309b5 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < ec15f6a50183fc01f470af74ad49900fb3731fca (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 36bb85cf36cab15fb611cb44b78a5df06e4e69a2 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
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          "programFiles": [
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()\n\nperf_pmu_sched_task() returns early when cpuctx-\u003etask_ctx is set, and\ncpc-\u003etask_epc is only non-NULL while a task context is scheduled in on\nthis CPU. __perf_pmu_sched_task() therefore always passes NULL:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00\n  pc : armv8pmu_sched_task+0x14/0x50\n  Call trace:\n   armv8pmu_sched_task+0x14/0x50 (P)\n   perf_pmu_sched_task+0xac/0x108\n   __perf_event_task_sched_out+0x6c/0xe0\n\nPass \u0026cpc-\u003eepc instead, the CPU-wide context for this PMU, which the\nfunction already dereferences a few lines up to find pmu.\n\narmv8pmu_sched_task() is the only in-tree implementation that\ndereferences the argument, and it only reads -\u003epmu, so the oops needs\nBRBE, added in v6.17."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/36bb85cf36cab15fb611cb44b78a5df06e4e69a2"
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      "title": "perf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98477",
    "datePublished": "2026-10-18T15:15:51.475Z",
    "dateReserved": "2026-09-25T10:25:14.351Z",
    "dateUpdated": "2026-10-21T12:55:10.170Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "perf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()\n\nperf_pmu_sched_task() returns early when cpuctx-\u003etask_ctx is set, and\ncpc-\u003etask_epc is only non-NULL while a task context is scheduled in on\nthis CPU. __perf_pmu_sched_task() therefore always passes NULL:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00\n  pc : armv8pmu_sched_task+0x14/0x50\n  Call trace:\n   armv8pmu_sched_task+0x14/0x50 (P)\n   perf_pmu_sched_task+0xac/0x108\n   __perf_event_task_sched_out+0x6c/0xe0\n\nPass \u0026cpc-\u003eepc instead, the CPU-wide context for this PMU, which the\nfunction already dereferences a few lines up to find pmu.\n\narmv8pmu_sched_task() is the only in-tree implementation that\ndereferences the argument, and it only reads -\u003epmu, so the oops needs\nBRBE, added in v6.17."
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      "cve": "CVE-2026-98477",
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}



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