{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64539", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.795Z", "datePublished": "2026-07-27T20:10:33.363Z", "dateUpdated": "2026-07-27T20:10:33.363Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-27T20:10:33.363Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix stack OOB write when prepending the Flags AD\n\neir_create_adv_data() builds the advertising data into a fixed-size\nbuffer (\"size\", 31 for the legacy path). It may prepend a 3-byte \"Flags\"\nAD structure (LE_AD_NO_BREDR on an LE-only controller) and then copies\nthe per-instance data without checking that it still fits:\n\n\tmemcpy(ptr, adv->adv_data, adv->adv_data_len);\n\ntlv_data_max_len() only reserves those 3 bytes when the user-supplied\nflags carry a managed-flags bit, so an instance added with flags == 0 is\naccepted with adv_data_len up to the full buffer. At advertise time the\nflags are still prepended, and the memcpy() writes 3 + adv_data_len\nbytes into the size-byte buffer:\n\n BUG: KASAN: stack-out-of-bounds in eir_create_adv_data (net/bluetooth/eir.c:301)\n Write of size 31 at addr ffff88800a547bdc by task kworker/u9:0/65\n Workqueue: hci0 hci_cmd_sync_work\n __asan_memcpy (mm/kasan/shadow.c:106)\n eir_create_adv_data (net/bluetooth/eir.c:301)\n hci_update_adv_data_sync (net/bluetooth/hci_sync.c:1310)\n hci_schedule_adv_instance_sync (net/bluetooth/hci_sync.c:1817)\n hci_cmd_sync_work (net/bluetooth/hci_sync.c:332)\n This frame has 1 object:\n [32, 64) 'cp'\n\nThe \"Flags\" structure is added by the kernel, not requested by\nuserspace, so only prepend it when it fits together with the instance\nadvertising data; when there is no room for both, drop the flags rather\nthan the user-provided data.\n\nReachable by a local user with CAP_NET_ADMIN owning an LE-only\ncontroller on the legacy advertising path."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/eir.c"], "versions": [{"version": "b44133ff03be30b55f23036e62f403a3f7784fce", "lessThan": "0f0b6232af56441d0a2dcb173cc4f8d8aab39014", "status": "affected", "versionType": "git"}, {"version": "b44133ff03be30b55f23036e62f403a3f7784fce", "lessThan": "09301f1fdf2aef8cce34d0c4650c30e7edb1ced9", "status": "affected", "versionType": "git"}, {"version": "b44133ff03be30b55f23036e62f403a3f7784fce", "lessThan": "f1b4df9c260c51726da2e86e19322825fddeefd0", "status": "affected", "versionType": "git"}, {"version": "b44133ff03be30b55f23036e62f403a3f7784fce", "lessThan": "57077eeb586c42f124bc09e018449362223067b3", "status": "affected", "versionType": "git"}, {"version": "b44133ff03be30b55f23036e62f403a3f7784fce", "lessThan": "6f5fb689fdf80bdd143f22a502f9eb1f3c85e286", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/eir.c"], "versions": [{"version": "4.1", "status": "affected"}, {"version": "0", "lessThan": "4.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "4.1", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0f0b6232af56441d0a2dcb173cc4f8d8aab39014"}, {"url": "https://git.kernel.org/stable/c/09301f1fdf2aef8cce34d0c4650c30e7edb1ced9"}, {"url": "https://git.kernel.org/stable/c/f1b4df9c260c51726da2e86e19322825fddeefd0"}, {"url": "https://git.kernel.org/stable/c/57077eeb586c42f124bc09e018449362223067b3"}, {"url": "https://git.kernel.org/stable/c/6f5fb689fdf80bdd143f22a502f9eb1f3c85e286"}], "title": "Bluetooth: eir: Fix stack OOB write when prepending the Flags AD", "x_generator": {"engine": "bippy-1.2.0"}}}}

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