Bluetooth: MGMT: validate Add Extended Advertising Data length

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Summary

CVECVE-2026-64126
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:54 UTC
Updated2026-07-19 16:17:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate Add Extended Advertising Data length MGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command, with MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler then uses cp->adv_data_len and cp->scan_rsp_len to validate and copy cp->data, but it never checks that those bytes are part of the mgmt command payload. A short command can therefore make add_ext_adv_data() pass an out-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond the command buffer are addressable, they can also be copied into the advertising instance as scan response data, where the caller can read them back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires CAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte slab-out-of-bounds read. Reject commands whose length does not match the fixed header plus both advertising data lengths before parsing cp->data.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee 0d5104390b445e7bd664ad583837e4c04d892c9d git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee 14b01b9cba04e6ce82825f68fc4c4322fa4ffa43 git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee a143ce77a5292f2c9285137433d879ce71d190a7 git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee a6c75a3fad226ccbd8ef9110dee87c92c299f2ab git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee f1febe93ef075314615f970a87681d9ab86691d1 git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee 0bc1a5a69f541859293d79db72bd7854ac48df51 git Not specified
CNA Linux Linux affected 12410572833a283ce92fcf9679ca8a2f372097ee d3f7d17960ed50df3a6709c5158caff989c8c905 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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