CVE-2026-80761
UnknownSummary
In the Linux kernel, the Bluetooth ISO function iso_sock_getname() does not zero the sockaddr structure before returning it to user space, leaking uninitialized bytes from the kernel stack.
Risk Assessment
An unprivileged process could exploit the information leak to discover sensitive kernel stack data, potentially aiding other attacks.
Recommendation
Apply the Linux kernel update containing the fix that zeroes the sockaddr structure before returning it.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: zero the sockaddr before returning it in getname iso_sock_getname() fills a struct sockaddr_iso in place and returns its size without clearing it first, so bytes it does not write are copied to user space from the kernel stack. The getsockname(2) and getpeername(2) paths both run through do_getsockname(), which hands getname() an uninitialized sockaddr_storage on the stack and copies back up to the number of bytes getname() returns, so the driver has to initialize every byte it accounts for. Two ranges are left uninitialized: - struct sockaddr_iso is 10 bytes but only 9 are written (family, iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every call. - for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of that structure, are never written. An unprivileged process can open a BTPROTO_ISO socket and reach the pad leak with getsockname(); the broadcast leak needs an established BIS/PA connection. l2cap and rfcomm already memset their sockaddr in getname for the same reason; do the same here.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS