222 lines
13 KiB
JSON
222 lines
13 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-2025-38722",
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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": "2025-04-16T04:51:24.033Z",
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"datePublished": "2025-09-04T15:33:15.641Z",
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"dateUpdated": "2026-10-30T12:22:16.988Z"
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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": "2026-10-30T12:22:16.988Z"
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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\nhabanalabs: fix UAF in export_dmabuf()\n\nAs soon as we'd inserted a file reference into descriptor table, another\nthread could close it. That's fine for the case when all we are doing is\nreturning that descriptor to userland (it's a race, but it's a userland\nrace and there's nothing the kernel can do about it). However, if we\nfollow fd_install() with any kind of access to objects that would be\ndestroyed on close (be it the struct file itself or anything destroyed\nby its ->release()), we have a UAF.\n\ndma_buf_fd() is a combination of reserving a descriptor and fd_install().\nhabanalabs export_dmabuf() calls it and then proceeds to access the\nobjects destroyed on close. In particular, it grabs an extra reference to\nanother struct file that will be dropped as part of ->release() for ours;\nthat \"will be\" is actually \"might have already been\".\n\nFix that by reserving descriptor before anything else and do fd_install()\nonly when everything had been set up. As a side benefit, we no longer\nhave the failure exit with file already created, but reference to\nunderlying file (as well as ->dmabuf_export_cnt, etc.) not grabbed yet;\nunlike dma_buf_fd(), fd_install() can't fail."
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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 bug is reached through the DRM_IOCTL_HL_MEMORY ioctl (HL_MEM_OP_EXPORT_DMABUF_FD) on the local /dev/accel/accelN character device, requiring local system access. No network or physical vector is involved.\nAC:L - The attacker owns both sides of the race — one thread issues the export ioctl while a sibling thread spins on close() of the deterministically-numbered fd in the same process's fd table — and the ioctl can be retried indefinitely until the window is won. No condition depends on external state the attacker cannot influence.\nPR:L - The ioctl is registered with flags 0, so drm_ioctl_permit(), accel_open(), hl_device_open() and hl_mem_ioctl() perform no capability, root, or DRM-auth check; only an open fd on the accel node is required, which unprivileged compute users and containerized AI workloads normally have.\nUI:N - The attacking process triggers the race entirely on its own with two of its own threads. No victim action, mount, or file open is needed.\nS:U - The premature reference drops corrupt kernel objects (struct hl_ctx, struct file) within the same kernel security authority. No IOMMU, hypervisor, or sandbox boundary is crossed.\nC:H - The use-after-free lets the attacker reclaim the freed hl_ctx/struct file slab objects with controlled content and have the kernel dereference them (ctx->hdev, ctx->hpriv->file_priv->filp), and the premature fput() on the accel device file yields a DirtyCred-style file UAF enabling arbitrary kernel memory disclosure.\nI:H - The exporting thread performs atomic refcount increments (hl_ctx_get, atomic_inc, get_file) through pointers read out of freed, attacker-reclaimable memory, giving a write primitive at an influenceable address; a dangling struct file reference is a well-established path to control-flow hijack and privilege escalation.\nA:H - Losing the race yields a NULL pointer dereference in memhash_node_export_put() (ctx is still NULL) or refcount underflow and use-after-free on the context and device file, causing an immediate kernel oops/panic that any local user can trigger repeatedly."
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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/accel/habanalabs/common/memory.c"
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],
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"versions": [
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{
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"lessThan": "5b0c23e9ec3e161a893d6ff9b4fad479e4539627",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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"status": "affected",
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"lessThan": "40deceb38f9db759772d1c289c28fd2a543f57fc",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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"lessThan": "33927f3d0ecdcff06326d6e4edb6166aed42811c",
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"status": "affected",
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}
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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/accel/habanalabs/common/memory.c"
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],
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"versions": [
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{
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"version": "5.16",
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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": "5.16",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.43",
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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": "6.15.11",
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"lessThanOrEqual": "6.15.*",
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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": "6.16.2",
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"lessThanOrEqual": "6.16.*",
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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",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.16",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5b0c23e9ec3e161a893d6ff9b4fad479e4539627"
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},
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{
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"url": "https://git.kernel.org/stable/c/d26058c2349d77d1ef179a2cc9752ca12004b6ff"
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{
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"url": "https://git.kernel.org/stable/c/c07886761fd6251db6938d4e747002e3d150d231"
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},
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{
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"url": "https://git.kernel.org/stable/c/40deceb38f9db759772d1c289c28fd2a543f57fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/55c232d7e0241f1d5120b595e7a9de24c75ed3d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/33927f3d0ecdcff06326d6e4edb6166aed42811c"
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}
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],
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"title": "habanalabs: fix UAF in export_dmabuf()",
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