Vulnerability-Lookup

FKIE_CVE-2026-23433

Vulnerability from fkie_nvd - Published: 2026-04-03 16:16 - Updated: 2026-04-23 20:59

Severity ?

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

Summary

In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Fix null pointer dereference when restoring bandwidth counters When an MSC supporting memory bandwidth monitoring is brought offline and then online, mpam_restore_mbwu_state() calls __ris_msmon_read() via ipi to restore the configuration of the bandwidth counters. It doesn't care about the value read, mbwu_arg.val, and doesn't set it leading to a null pointer dereference when __ris_msmon_read() adds to it. This results in a kernel oops with a call trace such as: Call trace: __ris_msmon_read+0x19c/0x64c (P) mpam_restore_mbwu_state+0xa0/0xe8 smp_call_on_cpu_callback+0x1c/0x38 process_one_work+0x154/0x4b4 worker_thread+0x188/0x310 kthread+0x11c/0x130 ret_from_fork+0x10/0x20 Provide a local variable for val to avoid __ris_msmon_read() dereferencing a null pointer when adding to val.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4ad79c874e53ebb7fe3b8ae7ac6c858a2121f415	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ac3e12bc195786d3d44d730b5b2259fd36191848	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.19
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "configurations": [
    {
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: Fix null pointer dereference when restoring bandwidth counters\n\nWhen an MSC supporting memory bandwidth monitoring is brought offline and\nthen online, mpam_restore_mbwu_state() calls __ris_msmon_read() via ipi to\nrestore the configuration of the bandwidth counters. It doesn\u0027t care about\nthe value read, mbwu_arg.val, and doesn\u0027t set it leading to a null pointer\ndereference when __ris_msmon_read() adds to it. This results in a kernel\noops with a call trace such as:\n\nCall trace:\n__ris_msmon_read+0x19c/0x64c (P)\nmpam_restore_mbwu_state+0xa0/0xe8\nsmp_call_on_cpu_callback+0x1c/0x38\nprocess_one_work+0x154/0x4b4\nworker_thread+0x188/0x310\nkthread+0x11c/0x130\nret_from_fork+0x10/0x20\n\nProvide a local variable for val to avoid __ris_msmon_read() dereferencing\na null pointer when adding to val."
    }
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  "id": "CVE-2026-23433",
  "lastModified": "2026-04-23T20:59:54.533",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
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        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-23433 (GCVE-0-2026-23433)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-04-13 06:07

Title

arm_mpam: Fix null pointer dereference when restoring bandwidth counters

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ac3e12bc195786d3d…
	https://git.kernel.org/stable/c/4ad79c874e53ebb7f…

Impacted products

Vendor

Product

Version

Linux

Affected: 41e8a14950e1732af51cfec8fa09f8ded02a5ca9 , < ac3e12bc195786d3d44d730b5b2259fd36191848 (git)
Affected: 41e8a14950e1732af51cfec8fa09f8ded02a5ca9 , < 4ad79c874e53ebb7fe3b8ae7ac6c858a2121f415 (git)

Linux

Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
            "drivers/resctrl/mpam_devices.c"
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          "vendor": "Linux",
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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-2026-23433

CVE-2026-23433 (GCVE-0-2026-23433)

Tags

Sightings

Nomenclature