CVE-2026-64128

Summary

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: drop ISO_END frames received without prior ISO_START

ISO data PDUs carry a packet-boundary flag indicating START, CONT, END or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing ISO_START by checking conn->rx_len before touching conn->rx_skb, but ISO_END does not.

If a peer sends an ISO_END as the first packet on a fresh ISO connection, conn->rx_skb is still NULL and conn->rx_len is zero, so skb_put(conn->rx_skb, …) dereferences NULL and oopses. For BIS, where receivers sync to a broadcaster without pairing, any broadcaster on the air can trigger this.

Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment is logged and dropped instead of crashing the host.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < 1c3d1e1696b72579b970e17999c503a14535205baffected
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < 3af41ee7ebecb0d5c8a504861f6cfad31345310faffected
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < 39f4a82e80c8f5ed2d6952d73fbafc895721a728affected
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < 61f2410a96dee808029e2ae4d6ef2dd635f3477faffected
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < e3a799881c12d27596232636a607e2e3fa448d63affected
LinuxLinuxccf74f2390d60a2f9a75ef496d2564abb478f46a < 84c24fb151fc1179355296d7ff29129ac7c42129affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References