{"id":"DEBIAN-CVE-2026-98567","details":"In the Linux kernel, the following vulnerability has been resolved:  net: xps: reject an out of range traffic class  Only the entries below dev-\u003enum_tc are valid in dev-\u003etc_to_txq[], and dev-\u003eprio_tc_map[] may only name classes below it. netdev_set_num_tc() lowers dev-\u003enum_tc without touching either array.  netdev_txq_to_tc() walks all TC_MAX_QUEUE slots and netdev_get_prio_tc_map() returns the entry as it stands, so a leftover entry is handed out as a traffic class \u003e= dev-\u003enum_tc. Taking that class from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a negative one and indexes an XPS map sized for dev-\u003enum_tc classes:  \ttci = j * num_tc + tc; \tRCU_INIT_POINTER(new_dev_maps-\u003eattr_map[tci], map);  attr_map[] holds nr_ids * num_tc entries and j runs over the ids named in the mask, so a class that is not below num_tc pushes tci past the end of the map for the last ids and the store overruns it.  Any caller that lowers num_tc leaves such entries behind, and mqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than netdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7] still describe txq 1..7. The splat is from an XPS write to txq 2 on a veth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and j == 6 stores one past the end of the 88-byte map:    BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954)   Write of size 8 at addr ffff88813016bc58 by task xps_oob/634    __netif_set_xps_queue (net/core/dev.c:2954)    xps_rxqs_store (net/core/net-sysfs.c:1880)    netdev_queue_attr_store (net/core/net-sysfs.c:1390)   Allocated by task 634:    __kmalloc_noprof (mm/slub.c:5439)    __netif_set_xps_queue (net/core/dev.c:2937)   The buggy address is located 0 bytes to the right of    allocated 88-byte region [ffff88813016bc00, ffff88813016bc58)  Reject a class the map has no room for.","modified":"2026-10-19T05:00:22.848179224Z","published":"2026-10-18T17:47:36.491360180Z","upstream":["CVE-2026-98567"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-98567"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.190-1"}]}],"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","6.1.176-1","6.1.177-1","6.1.180-1","6.1.187-1","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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