{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50233","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-06-18T10:57:27.432Z","datePublished":"2025-08-09T14:30:51.639Z","dateUpdated":"2026-08-05T08:57:49.382Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:57:49.382Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix using strlen with hdev->{dev_name,short_name}\n\nBoth dev_name and short_name are not guaranteed to be NULL terminated so\nthis instead use strnlen and then attempt to determine if the resulting\nstring needs to be truncated or not."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable strlen/eir_append paths are reached through the local HCI management socket (HCI_CHANNEL_CONTROL) via SET_LOCAL_NAME or READ_EXT_INFO, not by processing Bluetooth packets from a peer on the radio link.\nAC:L - After bluetoothd sets a typical adapter name of length >= 10, hdev->short_name is filled with 10 non-NUL bytes by memcpy, so strlen reliably reads out of bounds; an attacker can also set this state and trigger it deterministically with no race or attacker-uncontrollable condition.\nPR:L - READ_EXT_INFO is HCI_MGMT_UNTRUSTED so any local user can invoke append_eir_data_to_buf once the common non-NUL-terminated short_name state exists; on Android/desktop, apps or polkit-mediated users can also drive SET_LOCAL_NAME without init-namespace root.\nUI:N - The attacker opens their own HCI control socket and sends the mgmt command themselves; no separate victim action such as mounting a device or accepting a pairing request is required.\nS:U - Impact is host-kernel memory safety failure (OOB read/write and crash) within the same OS authority; this is not a VM escape, IOMMU/DMA bypass, or other cross-boundary compromise.\nC:H - strlen walks past short_name/dev_name into adjacent hci_dev fields, and eir_append_data copies that inflated u8 length into the READ_EXT_INFO response returned to userspace, disclosing more than a few bytes of kernel memory; stack/heap corruption from the same inflated length further enables read primitives.\nI:H - Inflated strlen results are passed into eir_append_data and written into undersized destinations (legacy scan_rsp HCI_MAX_AD_LENGTH=31, or the 512-byte mgmt ext-info stack buffer), producing out-of-bounds writes that can corrupt stack/heap and enable control-flow hijacking.\nA:H - The bugzilla reproducer hits fortify_panic/BUG in append_eir_data_to_buf on SET_LOCAL_NAME, and without FORTIFY the OOB read/write paths cause kernel oops/panic, fully denying availability."}]}],"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","net/bluetooth/mgmt.c"],"versions":[{"version":"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78","lessThan":"dd7b8cdde098cf9f7c8de409b5b7bbb98f97be80","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","net/bluetooth/mgmt.c"],"versions":[{"version":"4.14","status":"affected"},{"version":"0","lessThan":"4.14","status":"unaffected","versionType":"semver"},{"version":"6.0","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":"4.14","versionEndExcluding":"6.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/dd7b8cdde098cf9f7c8de409b5b7bbb98f97be80"}],"title":"Bluetooth: eir: Fix using strlen with hdev->{dev_name,short_name}","x_generator":{"engine":"bippy-1.2.0"}}}}