{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64066",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.030Z",
        "datePublished": "2026-07-19T15:39:44.032Z",
        "dateUpdated": "2026-08-05T12:38:50.075Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:38:50.075Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix netfs_read_to_pagecache() to pause on subreq failure\n\nFix netfs_read_to_pagecache() so that it pauses the generation of new\nsubrequests if an already-issued subrequest fails."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 9.8,
                        "baseSeverity": "CRITICAL"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - The bug is hit when processing failed network filesystem read completions from remote SMB/NFS/Ceph/9p servers; a malicious or compromised server can trigger mid-read I/O errors over the network during buffered readahead without local kernel access.\nAC:L - An attacker controlling the remote server can reliably cause read failures during large multi-subrequest readahead, and controls the timing of async completions that race the issuer thread; no uncontrollable conditions are required.\nPR:N - The attacker operates as a remote malicious network filesystem server and needs no local privileges on the victim; any user with read access to an already-mounted share can trigger the vulnerable path via normal file reads.\nUI:N - Exploitation requires only routine file access on pre-mounted enterprise NAS/CIFS home directories or auto-mounted virtio-fs/9p shares, with no additional victim action beyond normal reads.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a VM escape or cross-authority boundary bypass.\nC:H - Concurrent issuer/collector manipulation of rolling_buffer folio_queues after subrequest failure can cause use-after-free and out-of-bounds access on kernel heap objects, enabling arbitrary memory disclosure.\nI:H - The race allows continued I/O and buffer advancement after failure handling has abandoned regions, corrupting pagecache folio state and heap metadata in ways that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The synchronization bug causes kernel memory corruption that can trigger oops, BUG, or panic; even without full exploitation, repeated triggering causes system crashes."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/netfs/buffered_read.c"
                    ],
                    "versions": [
                        {
                            "version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
                            "lessThan": "884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
                            "lessThan": "0256e79ce42101ad036edd4205bccca621ea0927",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
                            "lessThan": "8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/netfs/buffered_read.c"
                    ],
                    "versions": [
                        {
                            "version": "6.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.34",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.11",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "6.12",
                                    "versionEndExcluding": "6.18.34"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "7.0.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "7.1"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0256e79ce42101ad036edd4205bccca621ea0927"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4"
                }
            ],
            "title": "netfs: Fix netfs_read_to_pagecache() to pause on subreq failure",
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}