CVE-2026-98477

Status: ReceivedUnscored—

Severity—Unscored

Exploitation probability0.17 %higher than 6% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

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:

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.

Technical details traces, logs and code from the original report

  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

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.17 %
Percentile among all scored CVEs: 6
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Show 4 references

Raw JSON (NVD)

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{
  "id": "CVE-2026-98477",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "bd27568117664b8b3e259721393df420ed51f57b",
              "lessThan": "b5409311b606d536cc485f3706c242c2afa93edb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bd27568117664b8b3e259721393df420ed51f57b",
              "lessThan": "249a2bd87a0e57dc28f36e992807edc9cae309b5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bd27568117664b8b3e259721393df420ed51f57b",
              "lessThan": "ec15f6a50183fc01f470af74ad49900fb3731fca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bd27568117664b8b3e259721393df420ed51f57b",
              "lessThan": "36bb85cf36cab15fb611cb44b78a5df06e4e69a2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/events/core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/events/core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:16:58.243",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/249a2bd87a0e57dc28f36e992807edc9cae309b5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/36bb85cf36cab15fb611cb44b78a5df06e4e69a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b5409311b606d536cc485f3706c242c2afa93edb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec15f6a50183fc01f470af74ad49900fb3731fca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix NULL pmu_ctx passed to pmu->sched_task()\n\nperf_pmu_sched_task() returns early when cpuctx->task_ctx is set, and\ncpc->task_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 &cpc->epc 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 ->pmu, so the oops needs\nBRBE, added in v6.17."
    }
  ],
  "lastModified": "2026-10-19T10:18:58.520",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}