{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-22068", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.814Z", "datePublished": "2025-04-16T14:12:21.436Z", "dateUpdated": "2026-08-05T11:56:29.279Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:56:29.279Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: make sure ubq->canceling is set when queue is frozen\n\nNow ublk driver depends on `ubq->canceling` for deciding if the request\ncan be dispatched via uring_cmd & io_uring_cmd_complete_in_task().\n\nOnce ubq->canceling is set, the uring_cmd can be done via ublk_cancel_cmd()\nand io_uring_cmd_done().\n\nSo set ubq->canceling when queue is frozen, this way makes sure that the\nflag can be observed from ublk_queue_rq() reliably, and avoids\nuse-after-free on uring_cmd." } ], "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 - Triggering requires local access to the ublk control/char/block devices (`/dev/ublk-control`, `/dev/ublkcN`, `/dev/ublkbN`) and io_uring syscalls. There is no remote or adjacent-network path into `ublk_queue_rq()` or the uring_cmd cancel handler.\nAC:L - The attacker controls both sides of the race — it submits a continuous block-I/O stream to its own ublk block device while concurrently closing the io_uring ring or killing the ublk server task to drive `ublk_uring_cmd_cancel_fn()` → `ublk_abort_requests()`. The window can be retried indefinitely at no cost, and ublk is enabled in mainstream distribution kernels.\nPR:L - `ublk_ctrl_add_dev()` explicitly allows a caller without CAP_SYS_ADMIN to create a device with `UBLK_F_UNPRIVILEGED_DEV`, with subsequent control commands gated only by `inode_permission()` on the owner-owned char device, so an ordinary local user can create, serve and issue I/O to a ublk device. Even for admin-created devices, the ublk server daemon and the exposed block device are routinely driven by non-root contexts.\nUI:N - The attacker performs every step itself — creating the device, running the server, submitting I/O, and tearing down the io_uring ring. No action by any other user or administrator is needed.\nS:U - The corruption is of an io_uring `io_kiocb` inside the kernel, exploited from a local process; impact stays within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free on the uring_cmd/`io_kiocb`: the freed object is re-read (`ioucmd->task_work_cb`, `req->ctx`, `req->io_task_work`) after reallocation, and the resulting controlled call/deref can be steered into an arbitrary kernel-memory disclosure primitive via the io_uring completion path.\nI:H - `__io_uring_cmd_do_in_task()` writes `task_work_cb` and `io_task_work.func` into the already-freed request and links it onto the ring's task-work list, and `io_uring_cmd_work()` then performs an indirect call through a function pointer sourced from that freed, heap-sprayable slab object — a write plus control-flow-hijack primitive leading to privilege escalation.\nA:H - Even unweaponized, the double-use of the uring_cmd causes double completion and use-after-free of the io_uring request, producing kernel oops/panic; the sibling fix for the same pairing was reported as a reproducible kernel crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/block/ublk_drv.c" ], "versions": [ { "version": "216c8f5ef0f209a3797292c487bdaa6991ab4b92", "lessThan": "7e3497d7dacb5aee69dd9be842b778083cae0e75", "status": "affected", "versionType": "git" }, { "version": "216c8f5ef0f209a3797292c487bdaa6991ab4b92", "lessThan": "5491400589e7572c2d2627ed6384302f7672aa1d", "status": "affected", "versionType": "git" }, { "version": "216c8f5ef0f209a3797292c487bdaa6991ab4b92", "lessThan": "9158359015f0eda00e521e35b7bc7ebce176aebf", "status": "affected", "versionType": "git" }, { "version": "216c8f5ef0f209a3797292c487bdaa6991ab4b92", "lessThan": "8741d0737921ec1c03cf59aebf4d01400c2b461a", "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/block/ublk_drv.c" ], "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.23", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.11", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.2", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "6.7", "versionEndExcluding": "6.12.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.13.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.14.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7e3497d7dacb5aee69dd9be842b778083cae0e75" }, { "url": "https://git.kernel.org/stable/c/5491400589e7572c2d2627ed6384302f7672aa1d" }, { "url": "https://git.kernel.org/stable/c/9158359015f0eda00e521e35b7bc7ebce176aebf" }, { "url": "https://git.kernel.org/stable/c/8741d0737921ec1c03cf59aebf4d01400c2b461a" } ], "title": "ublk: make sure ubq->canceling is set when queue is frozen", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free" } ] } ], "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": { "timestamp": "2025-10-01T16:16:10.823275Z", "id": "CVE-2025-22068", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T16:16:13.925Z" } } ] } }