{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-74713", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-74713" ], "published": "2026-08-22T15:32:12Z", "summary": "vhost_iotlb: bound map allocation in add_range", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost_iotlb: bound map allocation in add_range\n\nvhost_iotlb_add_range_ctx() only retires an old entry when the table\nhas a non-zero limit, has exactly reached that limit and has\nVHOST_IOTLB_FLAG_RETIRE set. Non-retiring tables can keep allocating\nentries after reaching their configured limit.\n\nExisting vhost devices allocate their IOTLB with max_iotlb_entries from\nvhost.c, which defaults to 2048 and is tunable by module parameter. Use\nthe caller-provided limit at the allocation point instead of adding a\nseparate default in the common IOTLB helper, and reject non-positive\nvalues in vhost paths that can report an error.\n\nOther vhost IOTLB users should not create zero-limit tables when entries\ncan be populated from userspace or guest-controlled requests. Add\ncaller-side max_iotlb_entries parameters for mlx5 vDPA, VDUSE and\nvhost-vDPA. Reject non-positive VDUSE and vhost-vDPA values, and require\nat least two entries for vdpa_sim and mlx5 vDPA paths that install\nfull-range mappings, since those mappings are split into two IOTLB\nentries.\n\nHandle full-range mappings in the common helper by checking that the\nIOTLB can hold both split entries before inserting the first half. This\navoids returning an error after leaving a half mapping behind.\n\nWhen the table is full, keep the existing retire behavior for retiring\ntables and return -ENOSPC for non-retiring tables. Reuse the retired map\nnode instead of freeing it and allocating a replacement, so a stream of\nIOTLB updates cannot keep forcing GFP_ATOMIC allocations after the table\nhas reached its limit. If a zero-limit IOTLB still reaches the common\nhelper, treat it as a configuration error and return -EINVAL.\n\nI found this bug myself, though the patch was written with AI assistance.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1", "1:6.6.74-1+rpt1", "1:6.12.20-1+rpt1~bpo12+1", "1:6.12.25-1+rpt1", "1:6.12.34-1+rpt1~bookworm", "1:6.12.47-1+rpt1~bookworm", "1:6.12.62-1+rpt1~bookworm", "1:6.12.75-1+rpt1~bookworm", "1:6.12.87-1+rpt1~bookworm", "1:6.12.93-1+rpt1", "1:6.12.96-1+rpt1", "1:6.12.109-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": 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"type": "FIX", "url": "https://git.kernel.org/stable/c/ae128dd19040ee06a4f8143c7ced4d18080d7a9a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-25T05:42:41Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.1, "cvss_v3_severity": "High", "scenario": "AV:L - The flaw is reached via local VHOST_IOTLB_UPDATE writes on /dev/vhost-* or /dev/vhost-vdpa char devices, or when a KVM guest drives virtio IOTLB misses that the VMM resolves through vhost; it is not triggered by remote network packets.\nAC:L - An attacker reliably floods distinct IOTLB mappings by repeatedly issuing VHOST_IOTLB_UPDATE messages or provoking guest IOTLB misses; no race, rare configuration, or attacker-uncontrollable memory layout is required once vhost IOTLB is active.\nPR:N - A malicious KVM guest can provoke unbounded IOTLB growth through normal virtio IOTLB-miss handling without any host credentials; a host attacker holding the vhost-vdpa/vhost device node also needs no capabilities beyond device access.\nUI:N - Exploitation requires no victim interaction beyond the VM or vhost device already being in use; the attacker programmatically drives the IOTLB update stream in a tight loop.\nS:C - In cloud/KVM deployments, an unprivileged guest VM causes unbounded host-kernel GFP_ATOMIC allocations in vhost_iotlb_add_range_ctx(), crossing the VM/host security boundary to deny service on the hypervisor.\nC:N - The bug causes only unbounded kmalloc of vhost_iotlb_map structures without out-of-bounds access, use-after-free, or information disclosure; successful exploitation does not read kernel memory.\nI:N - No memory corruption or arbitrary write occurs; impact is limited to kernel memory consumption and does not modify data or enable code execution through the allocation flaw itself.\nA:H - Unbounded IOTLB entry allocation or perpetual GFP_ATOMIC kmalloc when tables are at capacity exhausts kernel memory/atomic reserves, causing host OOM, kernel panics, or complete hypervisor denial of service." } } }