{"id":"CVE-2026-99192","revision":"5591209f397a46d991d14809f5c45fc4","records":[{"revision":"5591209f397a46d991d14809f5c45fc4","observedAt":"2026-10-28T11:27:43.363+00:00","statement":{"source":"cve-program","id":"CVE-2026-99192","aliases":[],"title":"net: bcmgenet: unshare the skb before writing the control block","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: unshare the skb before writing the control block\n\nbcmgenet stores first_cb, last_cb and bytes_sent in the skb control\nblock and reads them back on completion to free the skb and credit BQL.\nether_setup() leaves IFF_TX_SKB_SHARING set, so the stack can resubmit\na shared skb that is still in the ring. The next transmit overwrites\nlast_cb, so the earlier slots complete without crediting their bytes\nand BQL stalls the queue until the watchdog resets it.\n\nUnshare the skb before writing the control block.\n\nReproduce with pktgen in clone_skb mode, which hands the driver the same\nskb while earlier copies are still in the ring:\n\n  modprobe pktgen\n  pg=/proc/net/pktgen\n  echo \"add_device eth0\" > $pg/kpktgend_0\n  echo \"dst_mac AA:BB:CC:DD:EE:FF\" > $pg/eth0\n  echo \"dst 192.0.2.1\" > $pg/eth0\n  echo \"clone_skb 8\" > $pg/eth0\n  echo \"count 0\" > $pg/eth0\n  echo start > $pg/pgctrl &\n  sleep 5\n  echo stop > $pg/pgctrl\n  wait\n  cat /sys/class/net/eth0/queues/tx-0/byte_queue_limits/inflight\n\ninflight stays nonzero on the now idle queue. clone_skb 0 leaves it at\nzero.","state":0,"publishedAt":"2026-10-28T10:35:48.686+00:00","modifiedAt":"2026-10-28T10:35:48.686+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                        \"drivers/net/ethernet/broadcom/genet/bcmgenet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f48bed16a756f5bc0244acd581f61968f7d7c2a4\",\n                            \"lessThan\": \"40c04abcbc34e3afe338f41dae851ecbd72852ac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f48bed16a756f5bc0244acd581f61968f7d7c2a4\",\n                            \"lessThan\": \"7939ad3b4db9eadf45a64f0524f38337a9494672\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f48bed16a756f5bc0244acd581f61968f7d7c2a4\",\n                            \"lessThan\": \"89771ce4f8f67dcffae561b2ccac95c0f6e3aa01\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fb4ca2b4bc6712a6ad635df5b9b41131846589f9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.16.50\",\n                            \"lessThan\": \"3.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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                        \"drivers/net/ethernet/broadcom/genet/bcmgenet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/40c04abcbc34e3afe338f41dae851ecbd72852ac","https://git.kernel.org/stable/c/7939ad3b4db9eadf45a64f0524f38337a9494672","https://git.kernel.org/stable/c/89771ce4f8f67dcffae561b2ccac95c0f6e3aa01"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99192","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99192","identifiers":["CVE-2026-99192"]},"retained":false,"historicalAffected":[]}],"coverage":[]}