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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64188

net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 -> __rmnet_map_ingress_handler) may still hold a reference to the endpoint and dereference ep->egress_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: <TASK> __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) </TASK> 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->egress_dev to NULL during the grace period, creating a data race with lockless readers.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • ceed73a2cf4aff2921802aa3d21d45280677547d to < c4e676c3505c5058922dc1a6f1ded795f6758135affected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < 9918698cf3aee4032e12bb42fd5a951dc465339baffected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < 310b93246bfec7d4452507e0c15477377ed9f025affected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < 1078ae8175777e80c9637996fb4a46c55f0ce576affected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < 41e06fcc5df0774d212e70c5b503fc769492bce3affected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < 8b17adf6d4fb6bf61fa4c3f58366a7c082799a71affected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < f193e38cb257d033060b63f1cfd94af076b3a2abaffected
  • ceed73a2cf4aff2921802aa3d21d45280677547d to < d00c953a8f69921f484b629801766da68f27f658affected

Linux Linux

Default version status: affected

  • 4.14affected
  • 0 to < 4.14unaffected
  • 5.10.260 to ≤ 5.10.*unaffected
  • 5.15.211 to ≤ 5.15.*unaffected
  • 6.1.177 to ≤ 6.1.*unaffected
  • 6.6.144 to ≤ 6.6.*unaffected
  • 6.12.95 to ≤ 6.12.*unaffected
  • 6.18.37 to ≤ 6.18.*unaffected
  • 7.0.14 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References