{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64255",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.773Z",
        "datePublished": "2026-07-24T15:31:22.870Z",
        "dateUpdated": "2026-08-17T04:52:07.539Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:52:07.539Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers\n\nThree BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a\nstation ID without checking that sta_mask is non-zero. When sta_mask is\nzero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing\nan out-of-bounds access on fw_id_to_link_sta[].\n\nAdd WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call,\nconsistent with the existing check in iwl_mld_ampdu_rx_start()."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:A - The vulnerable BA-session handlers are driven by Wi-Fi aggregation, BAR/DELBA traffic, firmware notifications, and timers influenced by a radio peer, requiring Wi-Fi adjacency.\nAC:L - A malicious associated MLO peer can control ADDBA parameters, link-state transitions, aggregation traffic, DELBA delivery, and inactivity timing, allowing the sequence to be triggered repeatedly without an uncontrollable race.\nPR:N - The peer must have an existing mac80211 station relationship, but needs no host account, kernel capability, or administrative privilege; a malicious AP or associated station satisfies this gate.\nUI:N - Once the wireless relationship exists, the peer can trigger the vulnerable sequence entirely through protocol traffic without further victim action.\nS:U - The vulnerable driver and affected kernel memory belong to the same host security authority, with no VM, IOMMU, or other scope boundary crossed.\nC:H - The 0xFFFFFFFF index reads a pointer far outside the 16-entry array and then follows it through additional pointer dereferences, permitting disclosure of arbitrary kernel memory under a groomed layout.\nI:H - A bogus station pointer can reach the PN and mac80211 receive paths, where attacker-controlled PN bytes and station state are written through pointer-derived addresses, potentially enabling kernel memory corruption and control-flow hijacking.\nA:H - The invalid array access or subsequent pointer dereference can fault in NAPI, RX-queue, or timer context, causing a kernel oops or panic and complete system denial of service."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/wireless/intel/iwlwifi/mld/agg.c"
                    ],
                    "versions": [
                        {
                            "version": "9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b",
                            "lessThan": "1de92789ce31e46fa7e7d8e89c90b19cdb1c103b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b",
                            "lessThan": "fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b",
                            "lessThan": "f056fc2b927448d37eca6b6cacc3d1b0f67b20d2",
                            "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/net/wireless/intel/iwlwifi/mld/agg.c"
                    ],
                    "versions": [
                        {
                            "version": "6.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.38",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.3",
                            "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": "6.4",
                                    "versionEndExcluding": "6.18.38"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.4",
                                    "versionEndExcluding": "7.1.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.4",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2"
                }
            ],
            "title": "wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers",
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                "engine": "bippy-1.2.0"
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}