0.0
NA
CVE-2026-64188
net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
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.

INFO

Published Date :

July 20, 2026, 5:18 p.m.

Last Modified :

July 20, 2026, 5:18 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2026-64188 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
Solution
Add RCU support to the rmnet endpoint and use kfree_rcu for memory management.
  • Add rcu_head to struct rmnet_endpoint.
  • Replace kfree() with kfree_rcu().
  • Remove rmnet_vnd_dellink() call.
  • Inline nr_rmnet_devs decrement.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64188 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64188 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64188 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-64188 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 20, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': 'c4e676c3505c5058922dc1a6f1ded795f6758135', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': '9918698cf3aee4032e12bb42fd5a951dc465339b', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': '310b93246bfec7d4452507e0c15477377ed9f025', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': '1078ae8175777e80c9637996fb4a46c55f0ce576', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': '41e06fcc5df0774d212e70c5b503fc769492bce3', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': '8b17adf6d4fb6bf61fa4c3f58366a7c082799a71', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': 'f193e38cb257d033060b63f1cfd94af076b3a2ab', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceed73a2cf4aff2921802aa3d21d45280677547d', 'lessThan': 'd00c953a8f69921f484b629801766da68f27f658', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c', 'drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.37', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.14', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c', 'drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h'], 'defaultStatus': 'affected'}]
    Added 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.
    Added Reference https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576
    Added Reference https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025
    Added Reference https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3
    Added Reference https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71
    Added Reference https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b
    Added Reference https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135
    Added Reference https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658
    Added Reference https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.