CVE-2026-90270 (GCVE-0-2026-90270)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
arm_mpam: Disable driver unbind to avoid UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Disable driver unbind to avoid UAF When a user unbinds an MSC and that MSC is the only MSC left for a component then the corresponding mpam_component will be freed. If the user then goes on to read the schemata file in the resctrl filesystem then the mpam_component will be accessed from resctrl_arch_get_config() leading to a use after free. As the MPAM driver is not a module the unbind sysfs interface is the only way to trigger the remove. Instead of dealing with the complexity of allowing some unused MSC to unbind just remove the unbind sysfs interface.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f04046f2577a5c76167333ca99d3903ee5331ba0 , < 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2 (git)
Affected: f04046f2577a5c76167333ca99d3903ee5331ba0 , < bb1a0f582d519c0461b0940116e2b52c5ba31459 (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        }
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      "providerMetadata": {
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    "dateReserved": "2026-09-11T19:38:34.797Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: Disable driver unbind to avoid UAF\n\nWhen a user unbinds an MSC and that MSC is the only MSC left for a\ncomponent then the corresponding mpam_component will be freed. If the user\nthen goes on to read the schemata file in the resctrl filesystem then the\nmpam_component will be accessed from resctrl_arch_get_config() leading to a\nuse after free.\n\nAs the MPAM driver is not a module the unbind sysfs interface is the only\nway to trigger the remove. Instead of dealing with the complexity of\nallowing some unused MSC to unbind just remove the unbind sysfs interface."
          }
        ],
        "id": "CVE-2026-90270",
        "lastModified": "2026-09-17T17:17:23.573",
        "metrics": {},
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2026-90270",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90270.json",
      "version": "2"
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}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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