{"id":"CVE-2026-64545","revision":"004bb23fe07548eb83e478a700a66d1a","records":[{"revision":"004bb23fe07548eb83e478a700a66d1a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64545","aliases":[],"title":"net, bpf: check master for NULL in xdp_master_redirect()","description":"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->flags 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->flags 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.","state":0,"publishedAt":"2026-07-27T20:10:36.659+00:00","modifiedAt":"2026-10-19T20:48:39.877+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"c99ca049e910d61ddbd28cc2c47242f2bfbb4970\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"e2a56441233131fe18a76001de347ecda217e40c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"3876318ea54e83eb70982b8280a3c5e4e32269bf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"4edbcacca09f92b85d3951b6add11894b20a84bc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"03b743586a2469744e96e9c1015096d07240935d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"89c103d702b25ceb2d097faf854deb47b53b17ff\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\n \"lessThan\": \"e82d8cc4321c373dc46e741cd2dfdaa7921fddb7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c99ca049e910d61ddbd28cc2c47242f2bfbb4970","https://git.kernel.org/stable/c/e2a56441233131fe18a76001de347ecda217e40c","https://git.kernel.org/stable/c/3876318ea54e83eb70982b8280a3c5e4e32269bf","https://git.kernel.org/stable/c/4edbcacca09f92b85d3951b6add11894b20a84bc","https://git.kernel.org/stable/c/03b743586a2469744e96e9c1015096d07240935d","https://git.kernel.org/stable/c/89c103d702b25ceb2d097faf854deb47b53b17ff","https://git.kernel.org/stable/c/e82d8cc4321c373dc46e741cd2dfdaa7921fddb7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64545","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64545","identifiers":["CVE-2026-64545"]},"retained":false,"historicalAffected":[]}],"coverage":[]}