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-2025-38595",
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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": "2025-04-16T04:51:24.028Z",
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"datePublished": "2025-08-19T17:03:25.527Z",
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"dateUpdated": "2026-10-30T12:22:06.267Z"
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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": "2026-10-30T12:22:06.267Z"
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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\nxen: fix UAF in dmabuf_exp_from_pages()\n\n[dma_buf_fd() fixes; no preferences regarding the tree it goes through -\nup to xen folks]\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().\ngntdev dmabuf_exp_from_pages() calls it and then proceeds to access the\nobjects destroyed on close - starting with gntdev_dmabuf itself.\n\nFix that by doing reserving descriptor before anything else and do\nfd_install() only when everything had been set up."
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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 vulnerability is reached through `IOCTL_GNTDEV_DMABUF_EXP_FROM_REFS` on the local `/dev/xen/gntdev` misc device, requiring local access to the machine (dom0 or a HVM/PVH guest). No network-facing path reaches `dmabuf_exp_from_pages()`.\nAC:L - The attacker controls both sides of the race — one thread issues the export ioctl while another closes the freshly installed fd, whose number is deterministic (lowest free descriptor) — and the window spans a sleepable `mutex_lock()`, making it wide; the ioctl can be retried indefinitely until it wins.\nPR:L - `gntdev_ioctl()` contains no `capable()` or `CAP_*` checks at all, so any user able to open `/dev/xen/gntdev` can trigger it; Xen stacks that use this exact dma-buf path (automotive display virtualization, Qubes vchan) grant unprivileged users access to that node.\nUI:N - Exploitation is entirely self-contained within the attacker's own multi-threaded process issuing an ioctl and a concurrent `close()`; no victim action is required.\nS:U - The freed objects (`struct gntdev_dmabuf`, the gntdev `struct file`) and the resulting corruption all live in the same kernel's memory as the attacker's own domain; nothing crosses the hypervisor or IOMMU boundary.\nC:H - `get_file(gntdev_dmabuf->priv->filp)` reads a pointer out of freed, attacker-groomable `kmalloc-96` memory, and `list_add()` writes kernel heap pointers into that freed slot which can be read back via a resprayed object, yielding kernel memory disclosure; the resulting `struct file` UAF permits arbitrary kernel read.\nI:H - The unmatched `fput()` on `priv->filp` underflows the gntdev file refcount and frees a `struct file` still referenced by an open fd, and the code writes into the freed `gntdev_dmabuf` (`->fd = ret`, `list_add`) — a classic UAF/DirtyCred-style write primitive leading to control-flow hijack and privilege escalation.\nA:H - Losing the race before `list_add()` makes `dmabuf_exp_release()` run `list_del()` on a zeroed `list_head`, causing a NULL-pointer write oops (or a corruption WARN plus heap/list corruption), and the general UAF and file refcount underflow readily panic the kernel."
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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/xen/gntdev-dmabuf.c"
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],
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"versions": [
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{
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"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "2be49867e68abbeb52d7f5d15eb1216154e2c0a0",
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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": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "ba8bc644f168509c16d48444991de7cfea3f12ec",
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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": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "e5907885260401bba300d4d18d79875c05b82651",
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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": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "3edfd2353f301bfffd5ee41066e37320a59ccc2d",
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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": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "d59d49af4aeed9a81e673e37c26c6a3bacf1a181",
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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": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
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"lessThan": "532c8b51b3a8676cbf533a291f8156774f30ea87",
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"status": "affected",
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"versionType": "git"
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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/xen/gntdev-dmabuf.c"
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],
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"versions": [
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{
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"version": "4.19",
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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": "4.19",
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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": "6.12.42",
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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": "6.15.10",
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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": "6.16.1",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.1.191"
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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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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.6.160"
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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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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.12.42"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.15.10"
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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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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.16.1"
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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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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.17"
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}
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]
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}
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]
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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/2be49867e68abbeb52d7f5d15eb1216154e2c0a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/ba8bc644f168509c16d48444991de7cfea3f12ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/e5907885260401bba300d4d18d79875c05b82651"
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},
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{
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"url": "https://git.kernel.org/stable/c/3edfd2353f301bfffd5ee41066e37320a59ccc2d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d59d49af4aeed9a81e673e37c26c6a3bacf1a181"
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},
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{
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"url": "https://git.kernel.org/stable/c/532c8b51b3a8676cbf533a291f8156774f30ea87"
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}
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],
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"title": "xen: fix UAF in dmabuf_exp_from_pages()",
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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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}
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} |