{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-47748","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-09-30T16:00:12.960Z","datePublished":"2024-10-21T12:14:14.448Z","dateUpdated":"2026-08-05T11:39:56.054Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:39:56.054Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost_vdpa: assign irq bypass producer token correctly\n\nWe used to call irq_bypass_unregister_producer() in\nvhost_vdpa_setup_vq_irq() which is problematic as we don't know if the\ntoken pointer is still valid or not.\n\nActually, we use the eventfd_ctx as the token so the life cycle of the\ntoken should be bound to the VHOST_SET_VRING_CALL instead of\nvhost_vdpa_setup_vq_irq() which could be called by set_status().\n\nFixing this by setting up irq bypass producer's token when handling\nVHOST_SET_VRING_CALL and un-registering the producer before calling\nvhost_vring_ioctl() to prevent a possible use after free as eventfd\ncould have been released in vhost_vring_ioctl(). And such registering\nand unregistering will only be done if DRIVER_OK is set."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerability is reached exclusively through `ioctl()` calls (`VHOST_SET_VRING_CALL`, `VHOST_VDPA_SET_STATUS`) on the `/dev/vhost-vdpa-N` character device. This requires local access to the host; no network or adjacent-network path exists.\nAC:L - The attacker deterministically drives the entire sequence with ordinary ioctls — set a call fd, set DRIVER_OK, reset to invalidate the MSI vector, then rebind a new call fd — and controls both the eventfd allocation and the eventfd free, so the slab reuse that makes the stale token collide is attacker-driven grooming rather than an uncontrolled condition. No race with an independent party is involved.\nPR:L - No capability check exists anywhere on the path; the sole gate is DAC on the vhost-vdpa device node, which in the standard libvirt/QEMU hypervisor deployment is held by an unprivileged VMM account. An attacker with that account — or one who has compromised the QEMU process from a guest — reaches the bug without root.\nUI:N - The attacker performs the complete ioctl sequence and eventfd grooming from their own process. No action by any other user or administrator is needed.\nS:U - The vulnerable component and the primary impacted component are both the host kernel, so the memory corruption stays within a single security authority. The knock-on effect on other guests' interrupt-remapping entries is a consequence of host-kernel compromise rather than an exploit that crosses the boundary as its defining characteristic.\nC:H - The freed eventfd_ctx pointer is retained as an identity key in a global registry shared with KVM, and the resulting mismatched connect/disconnect plus irqbypass module refcount underflow give the attacker use-after-free access to kernel objects and module memory. Per standard kernel scoring, a use-after-free grants control over freed-object contents and is treated as enabling arbitrary kernel memory disclosure.\nI:H - The stale token causes `__disconnect()`/`__connect()` against the wrong consumer, reprogramming IOMMU interrupt-remapping entries for an unrelated VM with a foreign device IRQ, while the double `list_del()` on an already-unlinked node provides a linked-list unlink write primitive and the module refcount underflow enables a UAF on module text. These are exploitable for kernel memory corruption and control-flow hijacking.\nA:H - Executing `list_del()` on a node bearing `LIST_POISON1/LIST_POISON2` faults immediately with a general protection fault, and the mismatched KVM producer teardown trips `WARN_ON` and corrupts posted-interrupt state. This is a reliable kernel oops/panic that also disrupts unrelated guests on the host."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/vdpa.c"],"versions":[{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"927a2580208e0f9b0b47b08f1c802b7233a7ba3c","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"ec5f1b54ceb23475049ada6e7a43452cf4df88d1","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"ca64edd7ae93402af2596a952e0d94d545e2b9c0","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"fae9b1776f53aab93ab345bdbf653b991aed717d","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"7cf2fb51175cafe01df8c43fa15a06194a59c6e2","status":"affected","versionType":"git"},{"version":"2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60","lessThan":"02e9e9366fefe461719da5d173385b6685f70319","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/vdpa.c"],"versions":[{"version":"5.9","status":"affected"},{"version":"0","lessThan":"5.9","status":"unaffected","versionType":"semver"},{"version":"5.10.227","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.168","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.113","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.54","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.10.13","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11.2","lessThanOrEqual":"6.11.*","status":"unaffected","versionType":"semver"},{"version":"6.12","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.10.227"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.15.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.10.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.11.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0"},{"url":"https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c"},{"url":"https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1"},{"url":"https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0"},{"url":"https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d"},{"url":"https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2"},{"url":"https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319"}],"title":"vhost_vdpa: assign irq bypass producer token correctly","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-47748","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-10-21T12:58:17.248658Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-10-21T13:04:13.447Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T22:21:42.762Z"}}]}}