{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90045", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.783Z", "datePublished": "2026-09-16T10:33:42.411Z", "dateUpdated": "2026-09-17T09:29:30.123Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-17T09:29:30.123Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: ffs: fix mm lifetime handling\n\nio_data stores a pointer to the submitting task's mm_struct,\nbut does not currently hold a reference to it while async\nrequests are pending.\n\nThis can result in a use-after-free if the task exits before\ncompletion handling finishes.\n\nTake a reference with mmgrab() when queuing the read request\nand release it with mmdrop() on request completion."}], "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 UAF is reached via local aio_read/io_submit on FunctionFS ep files (ffs_epfile_read_iter \u2192 ffs_epfile_io), not by parsing USB host packets. This is the gadget userspace API; prior f_fs AIO UAFs (CVE-2024-36894, CVE-2025-71074) are scored Local, which is also the higher-severity vector versus Physical.\nAC:L - The attacker submits the AIO read, can complete it locally (dummy_hcd or an already-bound gadget) and exit while the ordered io_completion_wq worker is still pending. Both sides of the mm-lifetime race are attacker-driven and freely retryable, so this is not AC:H.\nPR:L - ffs_epfile_open has no capability check. FunctionFS mounts commonly set uid=/gid=/fmode= so unprivileged gadget daemons (adbd/shell, MTP) can open ep files; mounting needs init-namespace CAP_SYS_ADMIN, but using already-mounted endpoints does not.\nUI:N - The attacker performs io_submit and process exit itself. No separate victim action is required beyond an already-deployed FunctionFS gadget.\nS:U - The mm_struct use-after-free corrupts host kernel state within the same security authority. This is standard local kernel privilege escalation, not a VM, IOMMU, or sandbox escape.\nC:H - Use-after-free of mm_struct lets kthread_use_mm/switch_mm consume a reclaimed mm (including mm->pgd) and copy_to_iter through attacker-influenced page tables, yielding an arbitrary read primitive. Per scoring guidance, UAF is Confidentiality High.\nI:H - kthread_use_mm on a sprayed mm_struct can install attacker-controlled page tables, and ffs_copy_to_iter then writes the USB payload through them, giving an arbitrary write and control-flow hijack primitive. Per scoring guidance, UAF is Integrity High.\nA:H - Using a freed mm_struct in kthread_use_mm/switch_mm and copy_to_iter reliably oopses or panics the kernel even without a full exploit, so availability impact is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/f_fs.c"], "versions": [{"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "f3d31484b3f26d63c09e5569ebfaa1079a17f171", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "7411de0ce3b45286de1de82526795658ea6eacb0", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8", "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/usb/gadget/function/f_fs.c"], "versions": [{"version": "3.15", "status": "affected"}, {"version": "0", "lessThan": "3.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "3.15", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.15", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.15", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f3d31484b3f26d63c09e5569ebfaa1079a17f171"}, {"url": "https://git.kernel.org/stable/c/7411de0ce3b45286de1de82526795658ea6eacb0"}, {"url": "https://git.kernel.org/stable/c/5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8"}], "title": "USB: gadget: ffs: fix mm lifetime handling", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_fs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f3d31484b3f26d63c09e5569ebfaa1079a17f171", "status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "versionType": "git"}, {"lessThan": "7411de0ce3b45286de1de82526795658ea6eacb0", "status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "versionType": "git"}, {"lessThan": "5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8", "status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_fs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.15"}, {"lessThan": "3.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nUSB: gadget: ffs: fix mm lifetime handling\n\nio_data stores a pointer to the submitting task's mm_struct,\nbut does not currently hold a reference to it while async\nrequests are pending.\n\nThis can result in a use-after-free if the task exits before\ncompletion handling finishes.\n\nTake a reference with mmgrab() when queuing the read request\nand release it with mmdrop() on request completion."}], "id": "CVE-2026-90045", "lastModified": "2026-09-17T10:17:06.290", "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": "2026-09-16T11:17:17.763", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7411de0ce3b45286de1de82526795658ea6eacb0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3d31484b3f26d63c09e5569ebfaa1079a17f171"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f3d31484b3f26d63c09e5569ebfaa1079a17f171)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7411de0ce3b45286de1de82526795658ea6eacb0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.51)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.2.5)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0)"}}, {"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": "2026-09-17T02:00:09.625235+00:00", "updated": "2026-09-17T02:00:09.625271+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}