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Review reviewHigh

CVE-2026-64188

Linux

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 f...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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 f...

Affected product and versions

Product
Linux
Affected versions
>= ceed73a2cf4aff2921802aa3d21d45280677547d < c4e676c3505c5058922dc1a6f1ded795f6758135, >= ceed73a2cf4aff2921802aa3d21d45280677547d < 9918698cf3aee4032e12bb42fd5a951dc465339b, >= ceed73a2cf4aff2921802aa3d21d45280677547d < 310b93246bfec7d4452507e0c15477377ed9f025, >= ceed73a2cf4aff2921802aa3d21d45280677547d < 1078ae8175777e80c9637996fb4a46c55f0ce576, >= ceed73a2cf4aff2921802aa3d21d45280677547d < 41e06fcc5df0774d212e70c5b503fc769492bce3, >= ceed73a2cf4aff2921802aa3d21d45280677547d < 8b17adf6d4fb6bf61fa4c3f58366a7c082799a71, >= ceed73a2cf4aff2921802aa3d21d45280677547d < f193e38cb257d033060b63f1cfd94af076b3a2ab, >= ceed73a2cf4aff2921802aa3d21d45280677547d < d00c953a8f69921f484b629801766da68f27f658, >= 4.14
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available