{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64457",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.789Z",
        "datePublished": "2026-07-25T08:51:25.364Z",
        "dateUpdated": "2026-08-17T04:56:01.747Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:56:01.747Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_pci: fix vq info pointer lookup via wrong index\n\nUnbinding a virtio balloon device:\n\n    echo virtio0 > /sys/bus/virtio/drivers/virtio_balloon/unbind\n\ntriggers a NULL pointer dereference. The dmesg says:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000008\n    [...]\n    RIP: 0010:__list_del_entry_valid_or_report+0x5/0xf0\n    Call Trace:\n    <TASK>\n    vp_del_vqs+0x121/0x230\n    remove_common+0x135/0x150\n    virtballoon_remove+0xee/0x100\n    virtio_dev_remove+0x3b/0x80\n    device_release_driver_internal+0x187/0x2c0\n    unbind_store+0xb9/0xe0\n    kernfs_fop_write_iter.llvm.11660790530567441834+0xf6/0x180\n    vfs_write+0x2a9/0x3b0\n    ksys_write+0x5c/0xd0\n    do_syscall_64+0x54/0x230\n    entry_SYSCALL_64_after_hwframe+0x29/0x31\n    [...]\n    </TASK>\n\nThe virtio_balloon device registers 5 queues (inflate, deflate, stats,\nfree_page, reporting) but only the first two are unconditional. The\nstats, free_page and reporting queues are each conditional on their\nrespective feature bits. When any of these features are absent, the\ncorresponding vqs_info entry has name == NULL, creating holes in the\narray.\n\nThe root cause is an indexing mismatch introduced when vq info storage\nwas changed to be passed as an argument. vp_find_vqs_msix() and\nvp_find_vqs_intx() store the info pointer at vp_dev->vqs[i], where 'i'\nis the caller's sparse array index. However, the virtqueue itself gets\nvq->index assigned from queue_idx, a dense index that skips NULL\nentries. When holes exist, 'i' and queue_idx diverge. Later,\nvp_del_vqs() looks up info via vp_dev->vqs[vq->index] using the dense\nindex into the sparsely-populated array, and hits NULL.\n\nFix this by storing info at vp_dev->vqs[queue_idx] instead of\nvp_dev->vqs[i], so the store index matches the lookup index\n(vq->index). Apply the fix to both the MSIX and INTX paths."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/virtio/virtio_pci_common.c"
                    ],
                    "versions": [
                        {
                            "version": "89a1c435aec269d109ed46ca7bbb10fa8edf7ace",
                            "lessThan": "41e6dc1a10036c9f47057033f19af7e52ec464b6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89a1c435aec269d109ed46ca7bbb10fa8edf7ace",
                            "lessThan": "075bc3c779e1ea7294afabdcb7e0a49536959b28",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89a1c435aec269d109ed46ca7bbb10fa8edf7ace",
                            "lessThan": "64a4c0befa77bcc01076aec9f93863ffd4ed06b7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89a1c435aec269d109ed46ca7bbb10fa8edf7ace",
                            "lessThan": "f7d380fb525c13bdd114369a1979c80c346e6abc",
                            "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/virtio/virtio_pci_common.c"
                    ],
                    "versions": [
                        {
                            "version": "6.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.96",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "6.11",
                                    "versionEndExcluding": "6.12.96"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "6.18.39"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "7.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/41e6dc1a10036c9f47057033f19af7e52ec464b6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/075bc3c779e1ea7294afabdcb7e0a49536959b28"
                },
                {
                    "url": "https://git.kernel.org/stable/c/64a4c0befa77bcc01076aec9f93863ffd4ed06b7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f7d380fb525c13bdd114369a1979c80c346e6abc"
                }
            ],
            "title": "virtio_pci: fix vq info pointer lookup via wrong index",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}