{"id":"DEBIAN-CVE-2026-64121","details":"In the Linux kernel, the following vulnerability has been resolved:  net: ifb: report ethtool stats over num_tx_queues  ifb_dev_init() allocates dp-\u003etx_private to dev-\u003enum_tx_queues entries via kzalloc_objs(*txp, dev-\u003enum_tx_queues). Both IFB per-queue RX and TX stats live in those entries: ifb_xmit() updates txp-\u003erx_stats using the skb queue mapping, ifb_ri_tasklet() updates txp-\u003etx_stats, and ifb_stats64() aggregates both over dev-\u003enum_tx_queues.  The ethtool stats callbacks instead size and walk the per-queue stats with dev-\u003ereal_num_rx_queues and dev-\u003ereal_num_tx_queues. With an asymmetric device where the RX queue count exceeds the TX queue count, for example:      ip link add name ifb10 numtxqueues 1 numrxqueues 8 type ifb     ethtool -S ifb10  ifb_get_ethtool_stats() indexes past the tx_private allocation and copies adjacent slab data through ETHTOOL_GSTATS.  Use dev-\u003enum_tx_queues consistently for the stats strings, the stats count, and the stats data walks. This reports one RX stats group and one TX stats group for each backing ifb_q_private entry, which is the queue set IFB can actually populate.  Reproduced under UML+KASAN at v7.1-rc2:    BUG: KASAN: slab-out-of-bounds in ifb_fill_stats_data+0x3c/0xae   Read of size 8 at addr 0000000062dbd228 by task ethtool/36   ifb_fill_stats_data+0x3c/0xae   ifb_get_ethtool_stats+0xc0/0x129   __dev_ethtool+0x1ca5/0x363c   dev_ethtool+0x123/0x1b3   dev_ioctl+0x56c/0x744   sock_do_ioctl+0x15f/0x1b2   sock_ioctl+0x4d5/0x50a   sys_ioctl+0xd8b/0xde9  With the patch applied, the same UML+KASAN repro is silent and ethtool -S ifb10 reports only the stats backed by the single allocated tx_private entry.","modified":"2026-08-27T23:06:18.437880336Z","published":"2026-07-19T16:17:53.663Z","upstream":["CVE-2026-64121"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-64121"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.176-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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