CVE-2026-90383 (GCVE-0-2026-90383)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-10-30 12:35
VLAI
Title
misc: sgi-gru: remove interrupt-context page-table walks
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user page tables and supports only PMD-level large mappings on x86-64. Remove the direct walker. Send interrupt faults directly to user polling mode so the existing call-OS fallback retries them in process context. Remove the mmap-lock failure statistic that can no longer be incremented.
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 CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < 0ca505b973aa1a5e3fcca7bd04774e794ff5e662 (git)
Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < 5a540ced720b4397306337cab34af1af4b30827c (git)
Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < 877423f595b60f8fe7c18b64a5d283d9e1732a13 (git)
Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < 6248eb1833ff0adfdbbadd5f846c2f22e02a01b0 (git)
Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < ef81e4a1628ecfb9cfc442de10883f383faf17a1 (git)
Affected: 142586409c8be7dc071bb94d7cd2d69ccfd99b6b , < 928a8e9f523df845fc496bcb9811013b67aabec5 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: sgi-gru: remove interrupt-context page-table walks\n\nThe GRU TLB miss handler walks a process\u0027s page tables without holding\npage-table locks or a reference to the mapped page. It also uses a kernel\npage-table accessor on user page tables and supports only PMD-level large\nmappings on x86-64.\n\nRemove the direct walker. Send interrupt faults directly to user polling\nmode so the existing call-OS fallback retries them in process context.\n\nRemove the mmap-lock failure statistic that can no longer be incremented."
        }
      ],
      "metrics": [
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The attacker supplies the faulting VA by writing a virtual-mode GRU vload/vstore/bcopy into the mmap\u0027d GSEG on /dev/gru. gru_fault loads the context; the miss is handled by gru_intr (default GRU_OPT_MISS_FMM_INTR) or ioctl GRU_USER_CALL_OS (gru_handle_user_call_os), both of which called atomic_pte_lookup on that missvaddr.\nAC:L - gru_create_new_context defaults to GRU_OPT_MISS_FMM_INTR, so a mapped-mode GRU instruction reliably hits gru_intr, which mmap_read_trylocks gts-\u003ets_mm and runs atomic_pte_lookup. A 1GB hugetlb VMA is mis-walked with no race because pud_leaf is never checked; a second thread of the same process can also madvise/unmap during the unlocked walk.\nPR:L - gru_fops has no .open method and gru_file_mmap/gru_file_unlocked_ioctl do not call capable(). An unprivileged process that can open miscdevice \"gru\" (/dev/gru) can mmap the GSEG, ioctl GRU_CREATE_CONTEXT, and issue GRU instructions that reach atomic_pte_lookup; only gru_unload_all_contexts requires CAP_SYS_ADMIN.\nUI:N - The attacker alone opens /dev/gru, maps the GSEG, calls GRU_CREATE_CONTEXT, and issues the GRU instruction or GRU_USER_CALL_OS ioctl; no other user needs to act.\nS:U - atomic_pte_lookup feeds a GPA to tfh_write_restart on the host GRU chiplet. A bad PFN lets GRU DMA into host kernel or other-process memory, which is privilege escalation in the same kernel authority, not a guest-to-host or IOMMU-domain crossing.\nC:H - atomic_pte_lookup never tests pud_leaf, so pud_pgtable() on a 1GB hugetlb leaf treats attacker-controlled hugepage bytes as PMD/PTE entries. pte_pfn of that crafted entry is installed by tfh_write_restart, and gru_vload/bcopy then reads that physical page into the attacker-mapped GSEG. The walk also never pins the page, so a stale PFN can be read after reuse.\nI:H - gru_vstore, gru_bcopy, and AMO opcodes write through the GRU TLB entry programmed by tfh_write_restart. A PFN taken from the pud_leaf miswalk of attacker-controlled 1GB hugepage contents, or from an unpinned PTE reused after free, is therefore an arbitrary physical write.\nA:H - pte_offset_kernel() on a pud_leaf 1GB mapping (or on a PMD that is not a table) computes __va of a non-page-table PFN and dereferences it in gru_intr/atomic_pte_lookup, oopsing the kernel. GRU DMA through a stale unpinned PFN can also panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:35:26.007Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0ca505b973aa1a5e3fcca7bd04774e794ff5e662"
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          "url": "https://git.kernel.org/stable/c/5a540ced720b4397306337cab34af1af4b30827c"
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      "title": "misc: sgi-gru: remove interrupt-context page-table walks",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90383",
    "datePublished": "2026-09-17T16:09:19.875Z",
    "dateReserved": "2026-09-11T19:38:34.809Z",
    "dateUpdated": "2026-10-30T12:35:26.007Z",
    "state": "PUBLISHED"
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      "percentile": "0.05733"
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      "cve": "CVE-2026-90383",
      "id": "msrc_CVE-2026-90383",
      "initial_release_date": "2026-09-19T01:06:18.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "4",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "misc: sgi-gru: remove interrupt-context page-table walks",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90383.json",
      "version": "8"
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: sgi-gru: remove interrupt-context page-table walks\n\nThe GRU TLB miss handler walks a process\u0027s page tables without holding\npage-table locks or a reference to the mapped page. It also uses a kernel\npage-table accessor on user page tables and supports only PMD-level large\nmappings on x86-64.\n\nRemove the direct walker. Send interrupt faults directly to user polling\nmode so the existing call-OS fallback retries them in process context.\n\nRemove the mmap-lock failure statistic that can no longer be incremented."
          }
        ],
        "id": "CVE-2026-90383",
        "lastModified": "2026-10-30T13:20:51.780",
        "metrics": {
          "cvssMetricV31": [
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                "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"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2026-09-17T17:17:37.660",
        "references": [
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            "url": "https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:42:26+00:00",
      "cve": "CVE-2026-90383",
      "id": "CVE-2026-90383",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: sgi-gru: remove interrupt-context page-table walks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90383.json",
      "version": "3"
    }
  }
}



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