CVE-2026-64545 (GCVE-0-2026-64545)
Vulnerability from cvelistv5
Published
2026-07-27 20:10
Modified
2026-10-19 20:48
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net, bpf: check master for NULL in xdp_master_redirect() xdp_master_redirect() dereferences the result of netdev_master_upper_dev_get_rcu() without a NULL check, but that helper returns NULL when the receiving device has no upper-master adjacency. The reach guard only checks netif_is_bond_slave(). On bond slave release bond_upper_dev_unlink() drops the upper-master adjacency before clearing IFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window still passes netif_is_bond_slave() while master is already NULL, and faults on master->flags at offset 0xb0: BUG: kernel NULL pointer dereference, address: 00000000000000b0 RIP: 0010:xdp_master_redirect (net/core/filter.c:4432) Call Trace: xdp_master_redirect (net/core/filter.c:4432) bpf_prog_run_generic_xdp (include/net/xdp.h:700) do_xdp_generic (net/core/dev.c:5608) __netif_receive_skb_one_core (net/core/dev.c:6204) process_backlog (net/core/dev.c:6319) __napi_poll (net/core/dev.c:7729) net_rx_action (net/core/dev.c:7792) handle_softirqs (kernel/softirq.c:622) __dev_queue_xmit (include/linux/bottom_half.h:33) packet_sendmsg (net/packet/af_packet.c:3082) __sys_sendto (net/socket.c:2252) Kernel panic - not syncing: Fatal exception in interrupt The missing check dates back to the original code; commit 1921f91298d1 ("net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master") later added the master->flags read where the fault now lands but kept the unconditional deref. Check master for NULL before use; a NULL master is treated the same as one that is not up.
References
Impacted products
Vendor Product Version
Linux Linux Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
Version: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7
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where the attacker also holds the network configuration side (container/netns with bond and XDP control) both sides of the race are attacker-driven, which the kernel guidance classes as Low.\\nPR:N - No credentials or authentication are needed to send frames to a bonded interface, and the fault occurs in softirq during receive processing before any socket, filesystem, or user-level authorization is consulted \\u2014 matching the PR:N treatment of the sibling fix CVE-2026-53069 in this same function.\\nUI:N - No victim action is required; the slave-release window is reached by routine and externally-induced events (bond reconfiguration, `bond_enslave` rollback, NIC hotplug/`NETDEV_UNREGISTER`), and the attacker need only keep traffic flowing.\\nS:U - The NULL dereference and its consequences are confined to the kernel\u0027s own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\\nC:N - The bug is a read of `master-\u003eflags` at fixed offset 0xb0 from a NULL pointer, which faults immediately; no memory contents are returned to the attacker and no kernel addresses are disclosed.\\nI:N - There is no write primitive \\u2014 the defect is a read-side dereference that faults before `master-\u003enetdev_ops-\u003endo_xdp_get_xmit_slave()` is reached, so no kernel data or control flow is modified.\\nA:H - The dereference happens in softirq/interrupt context, producing \\\"Kernel panic - not syncing: Fatal exception in interrupt\\\" \\u2014 a complete system crash rather than a recoverable oops, and it can be re-triggered on every reboot as long as traffic and bond reconfiguration continue.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"c99ca049e910d61ddbd28cc2c47242f2bfbb4970\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"e2a56441233131fe18a76001de347ecda217e40c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"3876318ea54e83eb70982b8280a3c5e4e32269bf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"4edbcacca09f92b85d3951b6add11894b20a84bc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"03b743586a2469744e96e9c1015096d07240935d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"89c103d702b25ceb2d097faf854deb47b53b17ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\", \"lessThan\": \"e82d8cc4321c373dc46e741cd2dfdaa7921fddb7\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/filter.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/filter.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c99ca049e910d61ddbd28cc2c47242f2bfbb4970\"}, {\"url\": \"https://git.kernel.org/stable/c/e2a56441233131fe18a76001de347ecda217e40c\"}, {\"url\": \"https://git.kernel.org/stable/c/3876318ea54e83eb70982b8280a3c5e4e32269bf\"}, {\"url\": \"https://git.kernel.org/stable/c/4edbcacca09f92b85d3951b6add11894b20a84bc\"}, {\"url\": \"https://git.kernel.org/stable/c/03b743586a2469744e96e9c1015096d07240935d\"}, {\"url\": \"https://git.kernel.org/stable/c/89c103d702b25ceb2d097faf854deb47b53b17ff\"}, {\"url\": \"https://git.kernel.org/stable/c/e82d8cc4321c373dc46e741cd2dfdaa7921fddb7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet, bpf: check master for NULL in xdp_master_redirect()\\n\\nxdp_master_redirect() dereferences the result of\\nnetdev_master_upper_dev_get_rcu() without a NULL check, but that helper\\nreturns NULL when the receiving device has no upper-master adjacency.\\n\\nThe reach guard only checks netif_is_bond_slave(). On bond slave release\\nbond_upper_dev_unlink() drops the upper-master adjacency before clearing\\nIFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window\\nstill passes netif_is_bond_slave() while master is already NULL, and\\nfaults on master-\u003eflags at offset 0xb0:\\n\\n  BUG: kernel NULL pointer dereference, address: 00000000000000b0\\n  RIP: 0010:xdp_master_redirect (net/core/filter.c:4432)\\n  Call Trace:\\n   xdp_master_redirect (net/core/filter.c:4432)\\n   bpf_prog_run_generic_xdp (include/net/xdp.h:700)\\n   do_xdp_generic (net/core/dev.c:5608)\\n   __netif_receive_skb_one_core (net/core/dev.c:6204)\\n   process_backlog (net/core/dev.c:6319)\\n   __napi_poll (net/core/dev.c:7729)\\n   net_rx_action (net/core/dev.c:7792)\\n   handle_softirqs (kernel/softirq.c:622)\\n   __dev_queue_xmit (include/linux/bottom_half.h:33)\\n   packet_sendmsg (net/packet/af_packet.c:3082)\\n   __sys_sendto (net/socket.c:2252)\\n  Kernel panic - not syncing: Fatal exception in interrupt\\n\\nThe missing check dates back to the original code; commit 1921f91298d1\\n(\\\"net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master\\\")\\nlater added the master-\u003eflags read where the fault now lands but kept the\\nunconditional deref. Check master for NULL before use; a NULL master is\\ntreated the same as one that is not up.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:57:22.161Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64545\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:48:39.877Z\", \"dateReserved\": \"2026-07-19T15:36:31.795Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-27T20:10:36.659Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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