{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74726",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74726"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave's\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H"
    }
  ],
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74726"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local RTNL netlink (RTM_DELLINK) or bonding ioctl (SIOCBONDRELEASE) to remove/reconfigure slaves while bond_alb_monitor runs; the bug is in a delayed workqueue, not in packet receive or any remote network protocol path.\nAC:L - An attacker with CAP_NET_ADMIN controls both race sides\u2014timing slave removal/failover against the periodic ALB monitor after primary_is_promisc is set\u2014and can retry rapidly when rtnl_trylock fails, making NULL deref or promiscuity-counter underflow reliably winnable.\nPR:L - Triggering ALB bond setup and slave release requires CAP_NET_ADMIN, which unprivileged users can obtain inside a user+network namespace (unshare -Urn), enabling host-wide kernel panic without init-namespace root on typical distributions.\nUI:N - No victim interaction is required; the attacker programmatically creates an ALB bond, drives primary_is_promisc via slave disable/removal, and races bond_alb_monitor without any other user or administrator action.\nS:U - Impact is confined to kernel networking state and causes host kernel panic or netdev promiscuity corruption; it does not cross VM, container, or IOMMU security boundaries into another security authority.\nC:H - Beyond the NULL-deref crash path, the failover race underflows dev->promiscuity and permanently pins IFF_PROMISC on the new active slave, enabling sustained capture of all traffic on that bonded interface/segment\u2014a broad confidentiality impact on server/cloud HA deployments.\nI:L - The stale dev_set_promiscuity(-1) corrupts the netdev promiscuity counter (unsigned underflow to a huge value), improperly modifying kernel network device state even though it does not provide arbitrary memory write or code-execution primitives.\nA:H - If the active slave is removed without failover, the monitor dereferences a NULL curr_active_slave and panics the kernel, as confirmed by KASAN null-ptr-deref and \"Kernel panic - not syncing: Fatal exception\" in the fix commit."
    }
  }
}