FKIE_CVE-2026-64188

Vulnerability from fkie_nvd - Published: 2026-07-20 17:18 - Updated: 2026-07-20 17:18
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c4e676c3505c5058922dc1a6f1ded795f6758135",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "9918698cf3aee4032e12bb42fd5a951dc465339b",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "310b93246bfec7d4452507e0c15477377ed9f025",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "1078ae8175777e80c9637996fb4a46c55f0ce576",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "41e06fcc5df0774d212e70c5b503fc769492bce3",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "8b17adf6d4fb6bf61fa4c3f58366a7c082799a71",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "f193e38cb257d033060b63f1cfd94af076b3a2ab",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            },
            {
              "lessThan": "d00c953a8f69921f484b629801766da68f27f658",
              "status": "affected",
              "version": "ceed73a2cf4aff2921802aa3d21d45280677547d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.37",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-64188",
  "lastModified": "2026-07-20T17:18:21.853",
  "metrics": {},
  "published": "2026-07-20T17:18:21.853",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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