FKIE_CVE-2026-68126

Vulnerability from fkie_nvd - Published: 2026-08-10 13:19 - Updated: 2026-08-17 05:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: mac802154: hold an interface reference across the scan worker mac802154_scan_worker() captures the scanning sub-interface under RCU and then keeps dereferencing sdata->dev after rcu_read_unlock() and outside the rtnl -- in the failure traces, in mac802154_transmit_beacon_req() (skb->dev = sdata->dev), and in the end_scan cleanup. Nothing keeps that netdev alive across the worker iteration. A concurrent DEL_INTERFACE or PHY removal can unregister the interface once the worker drops the rtnl between its two drv_set_channel() sections. unregister_netdevice() frees the netdev asynchronously from netdev_run_todo() with the rtnl already dropped, so neither holding the rtnl nor the per-PHY IEEE802154_IS_SCANNING flag prevents a stale worker iteration from dereferencing the freed netdev -- a KASAN slab-use-after-free, reachable by racing TRIGGER_SCAN against DEL_INTERFACE (both CAP_NET_ADMIN). Pin the netdev with netdev_hold() while the RCU read lock is still held, and release it at every worker exit.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/234e5e898b713bc0b3a631b6f002897f43d046c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/59c1d5463b7bc5a2cdaae27108d1dfd67edc7d1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f303f622f6bb8907c405e5123a0ab0f70fb0065
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd7110f0caa32426140ff302a209c53294ef2cfd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd4754194a706163294b6141460101b99082c8c7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bd7110f0caa32426140ff302a209c53294ef2cfd",
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "versionType": "git"
            },
            {
              "lessThan": "dd4754194a706163294b6141460101b99082c8c7",
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "versionType": "git"
            },
            {
              "lessThan": "59c1d5463b7bc5a2cdaae27108d1dfd67edc7d1b",
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "versionType": "git"
            },
            {
              "lessThan": "5f303f622f6bb8907c405e5123a0ab0f70fb0065",
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "versionType": "git"
            },
            {
              "lessThan": "234e5e898b713bc0b3a631b6f002897f43d046c8",
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nmac802154: hold an interface reference across the scan worker\n\nmac802154_scan_worker() captures the scanning sub-interface under RCU\nand then keeps dereferencing sdata-\u003edev after rcu_read_unlock() and\noutside the rtnl -- in the failure traces, in\nmac802154_transmit_beacon_req() (skb-\u003edev = sdata-\u003edev), and in the\nend_scan cleanup. Nothing keeps that netdev alive across the worker\niteration.\n\nA concurrent DEL_INTERFACE or PHY removal can unregister the interface\nonce the worker drops the rtnl between its two drv_set_channel()\nsections. unregister_netdevice() frees the netdev asynchronously from\nnetdev_run_todo() with the rtnl already dropped, so neither holding the\nrtnl nor the per-PHY IEEE802154_IS_SCANNING flag prevents a stale worker\niteration from dereferencing the freed netdev -- a KASAN\nslab-use-after-free, reachable by racing TRIGGER_SCAN against\nDEL_INTERFACE (both CAP_NET_ADMIN).\n\nPin the netdev with netdev_hold() while the RCU read lock is still held,\nand release it at every worker exit."
    }
  ],
  "id": "CVE-2026-68126",
  "lastModified": "2026-08-17T05:18:12.293",
  "metrics": {},
  "published": "2026-08-10T13:19:57.813",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/234e5e898b713bc0b3a631b6f002897f43d046c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/59c1d5463b7bc5a2cdaae27108d1dfd67edc7d1b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5f303f622f6bb8907c405e5123a0ab0f70fb0065"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd7110f0caa32426140ff302a209c53294ef2cfd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd4754194a706163294b6141460101b99082c8c7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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