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CVE-2026-64539— Bluetooth: eir: Fix stack OOB write when prepending the Flags AD

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.1版本存在安全漏洞，该漏洞源于Bluetooth eir模块中eir_create_adv_data函数在预置Flags AD结构时未检查缓冲区空间，导致栈越界写入，可能导致具有CAP_NET_ADMIN权限的本地用户利用此漏洞造成栈缓冲区溢出。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux b44133ff03be30b55f23036e62f403a3f7784fce< 0f0b6232af56441d0a2dcb173cc4f8d8aab39014 affected
b44133ff03be30b55f23036e62f403a3f7784fce< 09301f1fdf2aef8cce34d0c4650c30e7edb1ced9 affected
b44133ff03be30b55f23036e62f403a3f7784fce< f1b4df9c260c51726da2e86e19322825fddeefd0 affected
b44133ff03be30b55f23036e62f403a3f7784fce< 57077eeb586c42f124bc09e018449362223067b3 affected
b44133ff03be30b55f23036e62f403a3f7784fce< 6f5fb689fdf80bdd143f22a502f9eb1f3c85e286 affected
4.1 affected
< 4.1 unaffected
6.1.178≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-64539

Vulnerability Information
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Vulnerability Title
Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: eir: Fix stack OOB write when prepending the Flags AD eir_create_adv_data() builds the advertising data into a fixed-size buffer ("size", 31 for the legacy path). It may prepend a 3-byte "Flags" AD structure (LE_AD_NO_BREDR on an LE-only controller) and then copies the per-instance data without checking that it still fits: memcpy(ptr, adv->adv_data, adv->adv_data_len); tlv_data_max_len() only reserves those 3 bytes when the user-supplied flags carry a managed-flags bit, so an instance added with flags == 0 is accepted with adv_data_len up to the full buffer. At advertise time the flags are still prepended, and the memcpy() writes 3 + adv_data_len bytes into the size-byte buffer: BUG: KASAN: stack-out-of-bounds in eir_create_adv_data (net/bluetooth/eir.c:301) Write of size 31 at addr ffff88800a547bdc by task kworker/u9:0/65 Workqueue: hci0 hci_cmd_sync_work __asan_memcpy (mm/kasan/shadow.c:106) eir_create_adv_data (net/bluetooth/eir.c:301) hci_update_adv_data_sync (net/bluetooth/hci_sync.c:1310) hci_schedule_adv_instance_sync (net/bluetooth/hci_sync.c:1817) hci_cmd_sync_work (net/bluetooth/hci_sync.c:332) This frame has 1 object: [32, 64) 'cp' The "Flags" structure is added by the kernel, not requested by userspace, so only prepend it when it fits together with the instance advertising data; when there is no room for both, drop the flags rather than the user-provided data. Reachable by a local user with CAP_NET_ADMIN owning an LE-only controller on the legacy advertising path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.1版本存在安全漏洞，该漏洞源于Bluetooth eir模块中eir_create_adv_data函数在预置Flags AD结构时未检查缓冲区空间，导致栈越界写入，可能导致具有CAP_NET_ADMIN权限的本地用户利用此漏洞造成栈缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b44133ff03be30b55f23036e62f403a3f7784fce ~ 0f0b6232af56441d0a2dcb173cc4f8d8aab39014 -
Linux Linux 4.1 -

II. Public POCs for CVE-2026-64539

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III. Intelligence Information for CVE-2026-64539

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Patches & Fixes for CVE-2026-64539 (3)

Same Patch Batch · Linux · 2026-07-27 · 26 CVEs total

CVE-2026-64534 9.8 CRITICAL nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64535 9.8 CRITICAL nvmet-tcp: Fix potential UAF when ddgst mismatch
CVE-2026-64541 9.8 CRITICAL net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
CVE-2026-64551 9.1 CRITICAL sctp: validate STALE_COOKIE cause length before reading staleness
CVE-2026-64555 8.8 HIGH KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
CVE-2026-64554 8.8 HIGH netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
CVE-2026-64552 8.4 HIGH virtio-net: fix len check in receive_big()
CVE-2026-64548 8.4 HIGH bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
CVE-2026-64536 8.1 HIGH staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop
CVE-2026-64547 8.1 HIGH net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
CVE-2026-64540 8.1 HIGH usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
CVE-2026-64532 7.8 HIGH fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
CVE-2026-64543 7.8 HIGH tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
CVE-2026-17523 7.8 HIGH can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
CVE-2026-64533 7.8 HIGH fs/ntfs3: validate lcns_follow in log_replay conversion
CVE-2026-64531 7.8 HIGH net: openvswitch: reject oversized nested action attrs
CVE-2026-64545 7.5 HIGH net, bpf: check master for NULL in xdp_master_redirect()
CVE-2026-64550 7.3 HIGH net: qualcomm: rmnet: validate MAP frame length before ingress parsing
CVE-2026-64546 7.1 HIGH drm/edid: fix OOB read in drm_parse_tiled_block()
CVE-2026-64544 crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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