{"id":"DEBIAN-CVE-2026-64188","details":"In the Linux kernel, the following vulnerability has been resolved:  net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()  rmnet_dellink() removes the endpoint from the hash table with hlist_del_init_rcu() and then immediately frees it with kfree(). However, RCU readers on the receive path (rmnet_rx_handler -\u003e __rmnet_map_ingress_handler) may still hold a reference to the endpoint and dereference ep-\u003eegress_dev after the memory has been freed. The endpoint is a kmalloc-32 object, and the stale read at offset 8 corresponds to the egress_dev pointer.    BUG: unable to handle page fault for address: ffffffffde942eef   Oops: 0002 [#1] SMP NOPTI   CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY   RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)   Call Trace:    \u003cTASK\u003e    __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)    rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)    __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)    __netif_receive_skb_one_core (net/core/dev.c:6208)    netif_receive_skb (net/core/dev.c:6467)    tun_get_user (drivers/net/tun.c:1955)    tun_chr_write_iter (drivers/net/tun.c:2003)    vfs_write (fs/read_write.c:688)    ksys_write (fs/read_write.c:740)    \u003c/TASK\u003e  Add an rcu_head field to struct rmnet_endpoint and replace kfree() with kfree_rcu() so the endpoint memory remains valid through the RCU grace period. Also remove the rmnet_vnd_dellink() call and inline only the nr_rmnet_devs decrement, since rmnet_vnd_dellink() would set ep-\u003eegress_dev to NULL during the grace period, creating a data race with lockless readers.","modified":"2026-09-01T16:06:55.132844350Z","published":"2026-07-20T17:18:21.853Z","upstream":["CVE-2026-64188"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-64188"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.177-1"}]}],"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","6.1.27-1","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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