CVE-2026-74726 (GCVE-0-2026-74726)
Vulnerability from cvelistv5
Published
2026-08-22 15:33
Modified
2026-10-16 19:16
Severity ?
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor bond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and takes RTNL via rtnl_trylock() before undoing the promiscuity it set on the active slave. In that window the active slave can change under RTNL (RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()), which already drops the promiscuity and clears primary_is_promisc. The monitor still acts on the stale decision: if the slave was removed with no failover, curr_active_slave is now NULL and the deref faults; if it failed over, the stale dev_set_promiscuity(-1) underflows the new slave's promiscuity counter and pins it in IFF_PROMISC. Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: b42 bond_alb_monitor RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) Kernel panic - not syncing: Fatal exception Re-check primary_is_promisc (and curr_active_slave) after taking RTNL so the monitor only undoes an increment it still owns. The other bonding monitors already re-read state under RTNL in their commit phase (bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only one acting on the pre-trylock decision.
References
Impacted products
Vendor Product Version
Linux Linux Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
Version: d0e81b7e2246a41d068ecaf15aac9de570816d63
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          "value": "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 -\u003e __bond_release_one() -\u003e 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\u0027s\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."
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              "value": "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-\u003epromiscuity 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."
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    "cveId": "CVE-2026-74726",
    "datePublished": "2026-08-22T15:33:17.128Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-10-16T19:16:12.256Z",
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\"lessThanOrEqual\": \"6.12.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.18.45\", \"lessThanOrEqual\": \"6.18.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.1.9\", \"lessThanOrEqual\": \"7.1.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.2\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"5.10.265\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"5.15.216\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"6.1.183\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"6.6.152\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"6.12.104\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"6.18.45\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"7.1.9\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.6.24\", \"versionEndExcluding\": \"7.2\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815\"}, {\"url\": \"https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71\"}, {\"url\": \"https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a\"}, {\"url\": \"https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c\"}, {\"url\": \"https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468\"}, {\"url\": \"https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187\"}, {\"url\": \"https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2\"}, {\"url\": \"https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d\"}], \"title\": \"bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-74726\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T19:15:46.761836Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T19:15:47.795Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74726\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-08-15T05:44:03.929Z\", \"datePublished\": \"2026-08-22T15:33:17.128Z\", \"dateUpdated\": \"2026-10-16T19:16:12.256Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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