193 lines
10 KiB
JSON
193 lines
10 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-2025-40302",
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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": "2025-04-16T07:20:57.185Z",
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"datePublished": "2025-12-08T00:46:26.293Z",
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"dateUpdated": "2026-10-15T22:02:43.093Z"
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},
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:09:21.585Z"
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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\nmedia: videobuf2: forbid remove_bufs when legacy fileio is active\n\nvb2_ioctl_remove_bufs() call manipulates queue internal buffer list,\npotentially overwriting some pointers used by the legacy fileio access\nmode. Forbid that ioctl when fileio is active to protect internal queue\nstate between subsequent read/write calls."
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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 - Exploitation requires opening a V4L2 device node (/dev/videoN) and issuing read()/write() plus the VIDIOC_REMOVE_BUFS ioctl from a local process. There is no network-reachable path into videobuf2's legacy fileio emulator.\nAC:L - The attack is a purely sequential, deterministic three-step sequence on a single file descriptor (read/write → REMOVE_BUFS → read/write) with no race window; the same fd owns the queue so vb2_queue_is_busy() never blocks it. No special memory layout or timing beyond attacker control is required.\nPR:L - Any local unprivileged user with access to the video device node can trigger this — desktop distros grant the active session user access via logind uaccess ACLs/the video group, and Android/embedded camera sandboxes expose these nodes directly. No CAP_SYS_ADMIN or other capability is checked on the ioctl path.\nUI:N - The attacking process performs every step itself on its own file descriptor; no victim action, mount, or plug-in event is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - After the buffers are freed, __vb2_perform_fileio() still does copy_to_user(data, buf->vaddr + buf->pos, count) using the stale cached kernel address, disclosing up to a full frame (potentially megabytes) of freed kernel memory — reusable by kernel stacks, slab objects, or page tables — directly to userspace.\nI:H - On output/write queues the same stale pointer is used in copy_from_user(buf->vaddr + buf->pos, data, count), giving an attacker-controlled write of arbitrary length into freed kernel memory (vfree'd vmalloc region reusable by VMAP kernel stacks, or page-allocator pages with dma-contig), a classic UAF write primitive for privilege escalation; a NULL-pointer write via b->planes[0].bytesused also occurs.\nA:H - vb2_get_buffer() returns NULL for the removed index despite the code asserting it \"can never be NULL when using fileio\", producing a NULL-pointer dereference oops, and the use-after-free of vfree'd vmalloc addresses causes unrecoverable kernel faults."
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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/media/common/videobuf2/videobuf2-v4l2.c"
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],
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"versions": [
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{
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"version": "a3293a85381ec9680aa2929547fbc76c5d87a1b2",
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"lessThan": "a6a493b985bfffac097a4e1be09f98b27729dca8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a3293a85381ec9680aa2929547fbc76c5d87a1b2",
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"lessThan": "e819b34df0a7030a15c968d619fa8a3ed2455c7a",
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"status": "affected",
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},
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{
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"version": "a3293a85381ec9680aa2929547fbc76c5d87a1b2",
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"lessThan": "27afd6e066cfd80ddbe22a4a11b99174ac89cced",
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]
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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/media/common/videobuf2/videobuf2-v4l2.c"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.12.58",
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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": "6.17.8",
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"lessThanOrEqual": "6.17.*",
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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": "6.18",
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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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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.12.58"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a6a493b985bfffac097a4e1be09f98b27729dca8"
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},
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{
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"url": "https://git.kernel.org/stable/c/e819b34df0a7030a15c968d619fa8a3ed2455c7a"
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},
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{
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"url": "https://git.kernel.org/stable/c/27afd6e066cfd80ddbe22a4a11b99174ac89cced"
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}
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],
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"title": "media: videobuf2: forbid remove_bufs when legacy fileio is active",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-40302",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:58:57.256388Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:43.093Z"
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