Vulnerability-Lookup

FKIE_CVE-2026-31528

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-04-28 18:00

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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  "cveTags": [],
  "descriptions": [
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      "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."
    }
  ],
  "id": "CVE-2026-31528",
  "lastModified": "2026-04-28T18:00:28.390",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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  "published": "2026-04-22T14:16:53.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-125"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-27 14:03

Title

perf: Make sure to use pmu_ctx->pmu for groups

Summary

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/656f35b463995bee0…
	https://git.kernel.org/stable/c/3a696e84a8b1fafdd…
	https://git.kernel.org/stable/c/35f7914e54fe7f136…
	https://git.kernel.org/stable/c/4c759446046500a1a…
	https://git.kernel.org/stable/c/4b9ce671960627b25…

Impacted products

Vendor

Product

Version

Linux

Affected: bd27568117664b8b3e259721393df420ed51f57b , < 656f35b463995bee024d948440128230aacd81e1 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 3a696e84a8b1fafdd774bb30d62919faf844d9e4 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 35f7914e54fe7f13654c22ee045b05e4b6d8062b (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4c759446046500a1a6785b25725725c3ff087ace (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4b9ce671960627b2505b3f64742544ae9801df97 (git)

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)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31528

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

Tags

Sightings

Nomenclature