Kernel-memory disclosure via unchecked MGMT payload lengths
Published Jul 19, 2026 · Updated Jul 19, 2026
Out-of-bounds read in the Linux Kernel Bluetooth MGMT handler allows local users to disclose kernel memory through a short command. add_ext_adv_data() trusts adv_data_len and scan_rsp_len without confirming that cp->data contains the declared bytes, then passes an out-of-bounds pointer to tlv_data_is_valid() and copies addressable trailing bytes into scan-response storage. Triggering requires CAP_NET_ADMIN in the initial user namespace and local access to a Bluetooth MGMT control socket; readable trailing bytes can be recovered with MGMT_OP_GET_ADV_INSTANCE, while KASAN demonstrated an eight-byte slab over-read.
Summary
What happened
Out-of-bounds read in the Linux Kernel Bluetooth MGMT handler allows local users to disclose kernel memory through a short command. add_ext_adv_data() trusts adv_data_len and scan_rsp_len without confirming that cp->data contains the declared bytes, then passes an out-of-bounds pointer to tlv_data_is_valid() and copies addressable trailing bytes into scan-response storage. Triggering requires CAP_NET_ADMIN in the initial user namespace and local access to a Bluetooth MGMT control socket; readable trailing bytes can be recovered with MGMT_OP_GET_ADV_INSTANCE, while KASAN demonstrated an eight-byte slab over-read.
The record
- CVE
- CVE-2026-64126
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1005
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <0bc1a5a69f541859293d79db72bd7854ac48df51
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <0d5104390b445e7bd664ad583837e4c04d892c9d
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <14b01b9cba04e6ce82825f68fc4c4322fa4ffa43
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <a143ce77a5292f2c9285137433d879ce71d190a7
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <a6c75a3fad226ccbd8ef9110dee87c92c299f2ab
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <d3f7d17960ed50df3a6709c5158caff989c8c905
- Affected versionversion=12410572833a283ce92fcf9679ca8a2f372097ee <f1febe93ef075314615f970a87681d9ab86691d1
- Affected versionversion=5.11
What conditions does exploitation require?
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Published CVSS scores
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Attacks
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Technologies
Your stack
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