# CVE-2026-80761: Bluetooth: ISO: zero the sockaddr before returning it in getname

CVE-2026-80761 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-80761, released September 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-80761
- Priority: Routine
- CVSS: 3.3 (Low)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80761

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-80761](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80761.md) | Sep 5, 2026 |
| Linux | linux Debian 14 | 7.1.12-1 | [DEBIAN-CVE-2026-80761](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80761.md) | Sep 5, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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