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-2024-46762",
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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": "2024-09-11T15:12:18.272Z",
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"datePublished": "2024-09-18T07:12:21.854Z",
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"dateUpdated": "2026-08-05T11:38:24.559Z"
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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": "2026-08-05T11:38:24.559Z"
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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: privcmd: Fix possible access to a freed kirqfd instance\n\nNothing prevents simultaneous ioctl calls to privcmd_irqfd_assign() and\nprivcmd_irqfd_deassign(). If that happens, it is possible that a kirqfd\ncreated and added to the irqfds_list by privcmd_irqfd_assign() may get\nremoved by another thread executing privcmd_irqfd_deassign(), while the\nformer is still using it after dropping the locks.\n\nThis can lead to a situation where an already freed kirqfd instance may\nbe accessed and cause kernel oops.\n\nUse SRCU locking to prevent the same, as is done for the KVM\nimplementation for irqfds."
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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 only through `ioctl(IOCTL_PRIVCMD_IRQFD)` on the `/dev/xen/privcmd` character device, requiring local access to the system. No remote or adjacent-network path exists to `privcmd_ioctl_irqfd()`.\nAC:L - The attacker controls both sides of the race, issuing the assign and deassign ioctls concurrently from its own threads on the same eventfd, and can retry in a tight loop; the window is further widened by the workqueue handoff to `irqfd_shutdown()` and the preemptible `HYPERVISOR_dm_op()` call in `irqfd_inject()`.\nPR:L - `privcmd_ioctl()` performs no capability check whatsoever — only the device-node permission gates access — and the `IOCTL_PRIVCMD_RESTRICT` design explicitly hands a privcmd fd to deprivileged device-model/virtio-backend daemons, which is exactly the scenario the irqfd interface was built for, so an unprivileged local process holding that fd can trigger the UAF.\nUI:N - The attacker performs the entire sequence itself with two concurrent ioctls on descriptors it owns; no action by any other user or victim process is needed.\nS:U - The use-after-free corrupts kernel memory in the same domain that hosts the calling process, giving standard local kernel privilege escalation rather than crossing the Xen guest/host or IOMMU boundary.\nC:H - The freed `privcmd_kernel_irqfd` is left registered in the eventfd wait queue and is re-read (`kirqfd->eventfd`, `kirqfd->xbufs`, `wait->func`) after `kfree()`, and the attacker chooses the allocation size via the unbounded `irqfd->size`, so resprayed slab contents can be leveraged into arbitrary kernel memory disclosure.\nI:H - `add_wait_queue_priority()` writes list pointers into the freed chunk and `kirqfd->error = rc` writes into it as well, while the dangling wait-queue entry causes a later `eventfd_signal()` to call a function pointer read from attacker-resprayed memory — a control-flow hijack / arbitrary-write primitive.\nA:H - The commit itself states the freed `kirqfd` access \"can lead to a situation where an already freed kirqfd instance may be accessed and cause kernel oops\"; the corrupted wait-queue list and freed `eventfd_ctx` reliably panic the kernel even without full exploitation."
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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/privcmd.c"
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],
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"versions": [
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{
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"version": "f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6",
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"lessThan": "e997b357b13a7d95de31681fc54fcc34235fa527",
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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": "f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6",
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"lessThan": "112fd2f02b308564724b8e81006c254d20945c4b",
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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": "f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6",
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"lessThan": "611ff1b1ae989a7bcce3e2a8e132ee30e968c557",
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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/privcmd.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.51",
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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": "6.10.10",
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"lessThanOrEqual": "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": "6.11",
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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": "6.6",
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"versionEndExcluding": "6.6.51"
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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": "6.6",
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"versionEndExcluding": "6.10.10"
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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": "6.6",
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"versionEndExcluding": "6.11"
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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/e997b357b13a7d95de31681fc54fcc34235fa527"
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},
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{
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"url": "https://git.kernel.org/stable/c/112fd2f02b308564724b8e81006c254d20945c4b"
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},
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{
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"url": "https://git.kernel.org/stable/c/611ff1b1ae989a7bcce3e2a8e132ee30e968c557"
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}
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],
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"title": "xen: privcmd: Fix possible access to a freed kirqfd instance",
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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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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2024-09-29T14:43:33.478974Z",
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"id": "CVE-2024-46762",
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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": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2024-09-29T14:43:47.331Z"
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}
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}
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]
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}
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} |