{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63972",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.024Z",
        "datePublished": "2026-07-19T14:55:58.503Z",
        "dateUpdated": "2026-08-05T12:37:43.858Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:37:43.858Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Skip redundant detach on already-detached port\n\nWhen mana_per_port_queue_reset_work_handler() runs after a previous\ndetach succeeded but attach failed, the port is left in a detached\nstate with apc->tx_qp and apc->rxqs already freed. Calling\nmana_detach() again unconditionally leads to NULL pointer dereferences\nduring queue teardown.\n\nAdd an early exit in mana_detach() when the port is already in\ndetached state (!netif_device_present) for non-close callers, making\nit safe to call idempotently. This allows the queue reset handler and\nother recovery paths to simply retry mana_attach() without redundant\nteardown."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - The primary path is mana_tx_timeout() on Azure MANA NICs, triggered by the netdev TX watchdog when queues stall; remote peers on internet-facing VMs can induce TX stalls that schedule the vulnerable mana_detach() recovery workqueue.\nAC:L - An attacker can repeatedly provoke TX watchdog timeouts and control retry timing; while attach failure between cycles may need memory pressure, remote connection floods can contribute and the attacker controls both sides of the reset race.\nPR:N - The TX-timeout recovery path requires no local VM privileges—only network reachability to influence the victim's MANA interface TX queue behavior and trigger automated driver recovery.\nUI:N - Exploitation is fully automated through the kernel netdev watchdog timer and workqueue handler with no victim user interaction required.\nS:U - Impact is a kernel panic within the same Azure VM guest; the MANA driver runs in guest context and does not cross a VM/host security boundary.\nC:N - The bug is a NULL pointer dereference during redundant queue teardown on already-freed pointers, causing a crash with no information disclosure primitive.\nI:N - There is no data modification or exploitable write primitive; the failure mode is dereferencing NULL tx_qp/rxqs pointers during teardown.\nA:H - The NULL pointer dereference in mana_detach()/mana_dealloc_queues() causes a kernel oops/panic, fully disrupting VM availability on affected Azure instances."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/microsoft/mana/mana_en.c"
                    ],
                    "versions": [
                        {
                            "version": "fb9f98e1041a30dd5766620a2a64cb472b54caa9",
                            "lessThan": "c4152b4e28b3e550ec99351bf900e2c24c2608cc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
                            "lessThan": "7ae590797f9b5c240aaea5773f5f00977a42a846",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
                            "lessThan": "5b05aa36ee24297d7296ca58dfd8c448d0e4cda3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.18.33",
                            "lessThan": "6.18.35",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/microsoft/mana/mana_en.c"
                    ],
                    "versions": [
                        {
                            "version": "7.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.35",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.12",
                            "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": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "6.18.35"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0",
                                    "versionEndExcluding": "7.1"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c4152b4e28b3e550ec99351bf900e2c24c2608cc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3"
                }
            ],
            "title": "net: mana: Skip redundant detach on already-detached port",
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}