CVE-2026-90383

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90383", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.809Z", "datePublished": "2026-09-17T16:09:19.875Z", "dateUpdated": "2026-10-30T12:35:26.007Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:35:26.007Z"}, "descriptions": [{"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's 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": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The attacker supplies the faulting VA by writing a virtual-mode GRU vload/vstore/bcopy into the mmap'd 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->ts_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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/sgi-gru/grufault.c", "drivers/misc/sgi-gru/gruprocfs.c", "drivers/misc/sgi-gru/grutables.h"], "versions": [{"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "0ca505b973aa1a5e3fcca7bd04774e794ff5e662", "status": "affected", "versionType": "git"}, {"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "5a540ced720b4397306337cab34af1af4b30827c", "status": "affected", "versionType": "git"}, {"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "877423f595b60f8fe7c18b64a5d283d9e1732a13", "status": "affected", "versionType": "git"}, {"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "6248eb1833ff0adfdbbadd5f846c2f22e02a01b0", "status": "affected", "versionType": "git"}, {"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "ef81e4a1628ecfb9cfc442de10883f383faf17a1", "status": "affected", "versionType": "git"}, {"version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "lessThan": "928a8e9f523df845fc496bcb9811013b67aabec5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/sgi-gru/grufault.c", "drivers/misc/sgi-gru/gruprocfs.c", "drivers/misc/sgi-gru/grutables.h"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0ca505b973aa1a5e3fcca7bd04774e794ff5e662"}, {"url": "https://git.kernel.org/stable/c/5a540ced720b4397306337cab34af1af4b30827c"}, {"url": "https://git.kernel.org/stable/c/877423f595b60f8fe7c18b64a5d283d9e1732a13"}, {"url": "https://git.kernel.org/stable/c/6248eb1833ff0adfdbbadd5f846c2f22e02a01b0"}, {"url": "https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1"}, {"url": "https://git.kernel.org/stable/c/928a8e9f523df845fc496bcb9811013b67aabec5"}], "title": "misc: sgi-gru: remove interrupt-context page-table walks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/misc/sgi-gru/grufault.c", "drivers/misc/sgi-gru/gruprocfs.c", "drivers/misc/sgi-gru/grutables.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0ca505b973aa1a5e3fcca7bd04774e794ff5e662", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}, {"lessThan": "5a540ced720b4397306337cab34af1af4b30827c", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}, {"lessThan": "877423f595b60f8fe7c18b64a5d283d9e1732a13", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}, {"lessThan": "6248eb1833ff0adfdbbadd5f846c2f22e02a01b0", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}, {"lessThan": "ef81e4a1628ecfb9cfc442de10883f383faf17a1", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}, {"lessThan": "928a8e9f523df845fc496bcb9811013b67aabec5", "status": "affected", "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/misc/sgi-gru/grufault.c", "drivers/misc/sgi-gru/gruprocfs.c", "drivers/misc/sgi-gru/grutables.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"lessThan": "2.6.27", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nmisc: sgi-gru: remove interrupt-context page-table walks\n\nThe GRU TLB miss handler walks a process's 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": [{"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"}]}, "published": "2026-09-17T17:17:37.660", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ca505b973aa1a5e3fcca7bd04774e794ff5e662"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5a540ced720b4397306337cab34af1af4b30827c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6248eb1833ff0adfdbbadd5f846c2f22e02a01b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/877423f595b60f8fe7c18b64a5d283d9e1732a13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/928a8e9f523df845fc496bcb9811013b67aabec5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[142586409c8be7dc071bb94d7cd2d69ccfd99b6b,877423f595b60f8fe7c18b64a5d283d9e1732a13)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[142586409c8be7dc071bb94d7cd2d69ccfd99b6b,6248eb1833ff0adfdbbadd5f846c2f22e02a01b0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[142586409c8be7dc071bb94d7cd2d69ccfd99b6b,ef81e4a1628ecfb9cfc442de10883f383faf17a1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[142586409c8be7dc071bb94d7cd2d69ccfd99b6b,928a8e9f523df845fc496bcb9811013b67aabec5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.27"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.27)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T08:15:13.906573+00:00", "updated": "2026-09-19T15:30:06.429776+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}