{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49076", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.246Z", "datePublished": "2025-02-26T01:54:39.251Z", "dateUpdated": "2026-08-05T08:53:45.482Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:45.482Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/hfi1: Fix use-after-free bug for mm struct\n\nUnder certain conditions, such as MPI_Abort, the hfi1 cleanup code may\nrepresent the last reference held on the task mm.\nhfi1_mmu_rb_unregister() then drops the last reference and the mm is freed\nbefore the final use in hfi1_release_user_pages(). A new task may\nallocate the mm structure while it is still being used, resulting in\nproblems. One manifestation is corruption of the mmap_sem counter leading\nto a hang in down_write(). Another is corruption of an mm struct that is\nin use by another task." } ], "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 bug is reached only through the hfi1 userspace character device path (/dev/hfi1_*, open/ioctl/write/close), specifically hfi1_file_close → hfi1_user_sdma_free_queues → hfi1_mmu_rb_unregister; it is not triggered by remote RDMA packet processing.\nAC:L - An attacker who opens the device, assigns a context (registering the mmu notifier and pinning SDMA pages), then exits reliably makes hfi1 cleanup the last mm holder because do_exit() calls exit_mm() before exit_files(); no conditions beyond attacker control are required.\nPR:L - The hfi1 user device is created with mode 0666 and assign_ctxt/open perform no capability checks, so any unprivileged local user with access to Omni-Path hardware can open it and trigger the path.\nUI:N - Exploitation requires only the attacker's own process actions (open, ioctl, write, exit); no victim user interaction is needed.\nS:U - Impact is confined to the host kernel privilege boundary (mm_struct corruption / local privilege escalation); there is no VM escape or IOMMU/DMA boundary crossing.\nC:H - This is a use-after-free of mm_struct: after mmu_notifier_unregister frees mm, do_remove still uses it via hfi1_release_user_pages; slab reuse of that mm enables corruption of another task's address-space metadata and arbitrary read primitives.\nI:H - UAF writes (e.g. atomic64_sub on mm->pinned_vm) against a reallocated mm_struct corrupt another task's mm (including mmap_lock and related state), enabling heap-spray-based arbitrary write / control-flow hijacking.\nA:H - The UAF reliably causes kernel hangs (mmap_sem/mmap_lock corruption leading to stuck down_write) and can oops/panic when the freed mm is reused or accessed improperly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/hfi1/mmu_rb.c" ], "versions": [ { "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79", "lessThan": "5f54364ff6cfcd14cddf5441c4a490bb28dd69f7", "status": "affected", "versionType": "git" }, { "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79", "lessThan": "9ca11bd8222a612de0d2f54d050bfcf61ae2883f", "status": "affected", "versionType": "git" }, { "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79", "lessThan": "0b7186d657ee55e2cdefae498f07d5c1961e8023", "status": "affected", "versionType": "git" }, { "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79", "lessThan": "5a9a1b24ddb510715f8f621263938186579a965c", "status": "affected", "versionType": "git" }, { "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79", "lessThan": "2bbac98d0930e8161b1957dc0ec99de39ade1b3c", "status": "affected", "versionType": "git" }, { "version": "5732f83596f8a573f2cde814cc76a54e1a8995c7", "status": "affected", "versionType": "git" }, { "version": "5.9.12", "lessThan": "5.10", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/hfi1/mmu_rb.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.111", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.34", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.20", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.3", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "5.10", "versionEndExcluding": "5.10.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.16.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.17.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5f54364ff6cfcd14cddf5441c4a490bb28dd69f7" }, { "url": "https://git.kernel.org/stable/c/9ca11bd8222a612de0d2f54d050bfcf61ae2883f" }, { "url": "https://git.kernel.org/stable/c/0b7186d657ee55e2cdefae498f07d5c1961e8023" }, { "url": "https://git.kernel.org/stable/c/5a9a1b24ddb510715f8f621263938186579a965c" }, { "url": "https://git.kernel.org/stable/c/2bbac98d0930e8161b1957dc0ec99de39ade1b3c" } ], "title": "RDMA/hfi1: Fix use-after-free bug for mm struct", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49076", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:17:39.018953Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:35.583Z" } } ] } }