159 lines
8.8 KiB
JSON
159 lines
8.8 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-37906",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.966Z",
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"datePublished": "2025-05-20T15:21:39.633Z",
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"dateUpdated": "2026-10-21T12:36:34.934Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-21T12:36:34.934Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd\n\nublk_cancel_cmd() calls io_uring_cmd_done() to complete uring_cmd, but\nwe may have scheduled task work via io_uring_cmd_complete_in_task() for\ndispatching request, then kernel crash can be triggered.\n\nFix it by not trying to canceling the command if ublk block request is\nstarted."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The race is reached only through local interfaces — `/dev/ublk-control` and `/dev/ublkc*` io_uring passthrough commands plus block I/O to `/dev/ublkb*`. There is no remote or adjacent-network path into ublk_drv.\nAC:L - The attacker owns both sides of the race: one thread submits I/O to the ublk block device (queueing `ublk_cmd_tw_cb` task work) while another tears down the io_uring ring or issues `UBLK_CMD_STOP_DEV`, driving `ublk_cancel_cmd()`. The window can be hit repeatedly in a loop with high queue depth until it lands.\nPR:L - ublk explicitly supports `UBLK_F_UNPRIVILEGED_DEV`, where `ublk_ctrl_add_dev()` accepts non-`CAP_SYS_ADMIN` callers and all later control commands gate only on file permissions of `/dev/ublkc*`, so an ordinary local user (including inside a container) can create and drive the device. Only basic local-user access is needed, not real root.\nUI:N - The attacking process performs every step itself — creating the ublk device, issuing I/O, and triggering cancellation. No victim action or interaction is required.\nS:U - The corruption is confined to kernel heap objects (`io_kiocb`) within the same security authority; the ublk driver and io_uring both run in the kernel's own scope. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed io_uring request is dereferenced and re-completed, so an attacker who reclaims the slab object controls its contents and can have kernel data posted back through the CQE and the ublk io path. Per UAF guidance this constitutes a path to arbitrary kernel memory disclosure.\nI:H - The second `io_uring_cmd_done()` writes result fields into and relinks a freed `io_kiocb`, and the request is freed twice — a write-after-free plus double-free on a well-known io_uring slab that is a standard heap-spray target for control-flow hijack. This is high-integrity memory corruption, not a bounded write.\nA:H - The commit states plainly that \"kernel crash can be triggered,\" and the double completion corrupts io_uring's completion/task-work lists. Any unprivileged local user with a ublk device can panic the machine on demand."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/block/ublk_drv.c"
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],
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"versions": [
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{
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"version": "216c8f5ef0f209a3797292c487bdaa6991ab4b92",
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"lessThan": "346b7d74c612234dae0878892682b9722e7c04c8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/block/ublk_drv.c"
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],
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"versions": [
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{
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"version": "6.7",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.7",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14.6",
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"lessThanOrEqual": "6.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.15",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.7",
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"versionEndExcluding": "6.12.114"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/346b7d74c612234dae0878892682b9722e7c04c8"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb2eb9ddf556f93fef45201e1f9d2b8674bcc975"
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},
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{
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"url": "https://git.kernel.org/stable/c/f40139fde5278d81af3227444fd6e76a76b9506d"
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}
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],
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"title": "ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd",
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"x_generator": {
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