CVE-2026-64188 (GCVE-0-2026-64188)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-07-20 16:27
VLAI
Title
net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < c4e676c3505c5058922dc1a6f1ded795f6758135 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 9918698cf3aee4032e12bb42fd5a951dc465339b (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 310b93246bfec7d4452507e0c15477377ed9f025 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 1078ae8175777e80c9637996fb4a46c55f0ce576 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 41e06fcc5df0774d212e70c5b503fc769492bce3 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 8b17adf6d4fb6bf61fa4c3f58366a7c082799a71 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < f193e38cb257d033060b63f1cfd94af076b3a2ab (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < d00c953a8f69921f484b629801766da68f27f658 (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.37 , ≤ 6.18.* (semver)
Unaffected: 7.0.14 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\n\nrmnet_dellink() removes the endpoint from the hash table with\nhlist_del_init_rcu() and then immediately frees it with kfree(). However,\nRCU readers on the receive path (rmnet_rx_handler -\u003e\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\ndereference ep-\u003eegress_dev after the memory has been freed. The endpoint is\na kmalloc-32 object, and the stale read at offset 8 corresponds to the\negress_dev pointer.\n\n  BUG: unable to handle page fault for address: ffffffffde942eef\n  Oops: 0002 [#1] SMP NOPTI\n  CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY\n  RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)\n  Call Trace:\n   \u003cTASK\u003e\n   __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)\n   rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)\n   __netif_receive_skb_one_core (net/core/dev.c:6208)\n   netif_receive_skb (net/core/dev.c:6467)\n   tun_get_user (drivers/net/tun.c:1955)\n   tun_chr_write_iter (drivers/net/tun.c:2003)\n   vfs_write (fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)\n   \u003c/TASK\u003e\n\nAdd an rcu_head field to struct rmnet_endpoint and replace kfree() with\nkfree_rcu() so the endpoint memory remains valid through the RCU grace\nperiod. Also remove the rmnet_vnd_dellink() call and inline only the\nnr_rmnet_devs decrement, since rmnet_vnd_dellink() would set\nep-\u003eegress_dev to NULL during the grace period, creating a data race\nwith lockless readers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T16:27:47.216Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135"
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          "url": "https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b"
        },
        {
          "url": "https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025"
        },
        {
          "url": "https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576"
        },
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          "url": "https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3"
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          "url": "https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658"
        }
      ],
      "title": "net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()",
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    "dateReserved": "2026-07-19T07:54:57.040Z",
    "dateUpdated": "2026-07-20T16:27:47.216Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-64188",
      "date": "2026-07-21",
      "epss": "0.00165",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64188\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-20T17:18:21.853\",\"lastModified\":\"2026-07-20T17:18:21.853\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\\n\\nrmnet_dellink() removes the endpoint from the hash table with\\nhlist_del_init_rcu() and then immediately frees it with kfree(). However,\\nRCU readers on the receive path (rmnet_rx_handler -\u003e\\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\\ndereference ep-\u003eegress_dev after the memory has been freed. The endpoint is\\na kmalloc-32 object, and the stale read at offset 8 corresponds to the\\negress_dev pointer.\\n\\n  BUG: unable to handle page fault for address: ffffffffde942eef\\n  Oops: 0002 [#1] SMP NOPTI\\n  CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY\\n  RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)\\n  Call Trace:\\n   \u003cTASK\u003e\\n   __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)\\n   rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)\\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)\\n   __netif_receive_skb_one_core (net/core/dev.c:6208)\\n   netif_receive_skb (net/core/dev.c:6467)\\n   tun_get_user (drivers/net/tun.c:1955)\\n   tun_chr_write_iter (drivers/net/tun.c:2003)\\n   vfs_write (fs/read_write.c:688)\\n   ksys_write (fs/read_write.c:740)\\n   \u003c/TASK\u003e\\n\\nAdd an rcu_head field to struct rmnet_endpoint and replace kfree() with\\nkfree_rcu() so the endpoint memory remains valid through the RCU grace\\nperiod. Also remove the rmnet_vnd_dellink() call and inline only the\\nnr_rmnet_devs decrement, since rmnet_vnd_dellink() would set\\nep-\u003eegress_dev to NULL during the grace period, creating a data race\\nwith lockless readers.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.37\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.14\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T06:22:57+00:00",
      "cve": "CVE-2026-64188",
      "id": "CVE-2026-64188",
      "initial_release_date": "2026-07-20T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64188.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-07-21T12:58:05Z",
      "cve": "CVE-2026-64188",
      "id": "CVE-2026-64188",
      "initial_release_date": "2026-07-21T12:58:05Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64188",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64188.json",
      "version": "2"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.