CVE-2026-64255

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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", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64255", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:37:57.745113Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:28:16.644Z"}}]}}

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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()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.38", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.3", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:52:07.539Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64255", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:28:16.644Z", "dateReserved": "2026-07-19T15:36:31.773Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-24T15:31:22.870Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1de92789ce31e46fa7e7d8e89c90b19cdb1c103b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f056fc2b927448d37eca6b6cacc3d1b0f67b20d2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.38)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.1.3)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.38,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.3,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-24T23:00:05.574570+00:00", "updated": "2026-08-13T11:00:12.628080+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}