CVE-2026-64128
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.
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1c3d1e1696b72579b970e17999c503a14535205bPatch
- https://git.kernel.org/stable/c/39f4a82e80c8f5ed2d6952d73fbafc895721a728Patch
- https://git.kernel.org/stable/c/3af41ee7ebecb0d5c8a504861f6cfad31345310fPatch
- https://git.kernel.org/stable/c/61f2410a96dee808029e2ae4d6ef2dd635f3477fPatch
- https://git.kernel.org/stable/c/84c24fb151fc1179355296d7ff29129ac7c42129Patch
- https://git.kernel.org/stable/c/e3a799881c12d27596232636a607e2e3fa448d63Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.