Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80760
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:01 UTC
Updated2026-09-04 16:18:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255 mgmt_hci_cmd_sync() checks that the message length agrees with params_len but puts no upper bound on it. params_len is __le16 while the parameter length in the HCI command header is a u8: struct hci_command_hdr { __le16 opcode; __u8 plen; } __packed; hci_cmd_sync_alloc() assigns one to the other: hdr->plen = plen; if (plen) skb_put_data(skb, param, plen); so a params_len of 256 leaves plen at 0 while all 256 bytes are still appended. The frame handed to the driver then declares no parameters and carries 256 of them. On a length framed transport such as H:4 the controller takes the trailing bytes as the start of the next packet. The mgmt socket MTU is HCI_MAX_FRAME_SIZE, so params_len can reach about 1KB this way. Commit 03f1700b9b4d ("Bluetooth: MGMT: reject malformed HCI_CMD_SYNC commands") only made params_len agree with the message length, a value that fits the message but not the header field is still accepted. Reject params_len that does not fit the header field.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063130000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 827af4787e74e8df9e8e0677a69fbb15e0856d2f b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894 git Not specified
CNA Linux Linux affected 827af4787e74e8df9e8e0677a69fbb15e0856d2f 0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2 git Not specified
CNA Linux Linux affected 827af4787e74e8df9e8e0677a69fbb15e0856d2f 6e1c44878aa3ee7336efeaf01414b030b0a5c273 git Not specified
CNA Linux Linux affected 827af4787e74e8df9e8e0677a69fbb15e0856d2f 5d95286b6d6e8f1d304da7522bfa6860fc017e48 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d95286b6d6e8f1d304da7522bfa6860fc017e48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e1c44878aa3ee7336efeaf01414b030b0a5c273 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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