FKIE_CVE-2026-68345

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 06:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: arm_mpam: guard MBWU state before adding it to garbage __destroy_component_cfg() adds each RIS mbwu_state object to the MPAM garbage list when destroying component configuration. However, mbwu_state is allocated per RIS and only for RISes with MBWU monitors. A component can therefore have comp->cfg allocated while some RISes still have ris->mbwu_state set to NULL. Passing a NULL mbwu_state to add_to_garbage() dereferences the NULL pointer inside the macro. Skip RISes that do not have an mbwu_state object before adding them to the garbage list.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/977f52909c624210178a1247fab0b02b110c1106
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca1f96334267ab8d47b2c9d535cdc9920fdde269
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/resctrl/mpam_devices.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ca1f96334267ab8d47b2c9d535cdc9920fdde269",
              "status": "affected",
              "version": "41e8a14950e1732af51cfec8fa09f8ded02a5ca9",
              "versionType": "git"
            },
            {
              "lessThan": "977f52909c624210178a1247fab0b02b110c1106",
              "status": "affected",
              "version": "41e8a14950e1732af51cfec8fa09f8ded02a5ca9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/resctrl/mpam_devices.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: guard MBWU state before adding it to garbage\n\n__destroy_component_cfg() adds each RIS mbwu_state object to the MPAM\ngarbage list when destroying component configuration.\n\nHowever, mbwu_state is allocated per RIS and only for RISes with MBWU\nmonitors. A component can therefore have comp-\u003ecfg allocated while some\nRISes still have ris-\u003embwu_state set to NULL.\n\nPassing a NULL mbwu_state to add_to_garbage() dereferences the NULL\npointer inside the macro.\n\nSkip RISes that do not have an mbwu_state object before adding them to\nthe garbage list."
    }
  ],
  "id": "CVE-2026-68345",
  "lastModified": "2026-08-17T06:17:42.740",
  "metrics": {},
  "published": "2026-08-10T13:20:25.093",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/977f52909c624210178a1247fab0b02b110c1106"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca1f96334267ab8d47b2c9d535cdc9920fdde269"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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