{"id":"CVE-2026-99184","revision":"a5f5f61828fe45f38a73824b5dfa62e6","records":[{"revision":"a5f5f61828fe45f38a73824b5dfa62e6","observedAt":"2026-10-28T11:27:43.363+00:00","statement":{"source":"cve-program","id":"CVE-2026-99184","aliases":[],"title":"accel/rocket: search every core slot when a core is removed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: search every core slot when a core is removed\n\nrocket_remove() decrements rdev->num_cores for each core it removes,\nwhile find_core_for_dev() searches slots 0 to num_cores - 1. Unbinding\nthe cores in the order they were bound therefore loses the last one: by\nthe time it is removed the search range has already shrunk past its\nslot, so find_core_for_dev() returns -1 and rocket_remove() gives up\nwithout doing anything.\n\nnum_cores never reaches zero, rocket_device_fini() never runs, and the\nfile-scoped rdev keeps pointing at a device that is going away. Binding\nthe cores again starts from that stale count, because rocket_probe()\ntakes rdev->num_cores as the slot to fill. On an RK3588, which describes\nthree cores, the second round lands on slots 1, 2 and 3 while rdev->cores\nwas allocated with room for three:\n\n rocket fdab0000.npu: Rockchip NPU core 1 version: 1179210309\n rocket fdac0000.npu: Rockchip NPU core 2 version: 1179210309\n rocket fdad0000.npu: Rockchip NPU core 3 version: 1179210309\n\nThe write to rdev->cores[3] is past the end of the array.\n\nNothing in tree reads the core array often enough to notice, so the\noverrun is silent today. It turned up while testing a devfreq series on\ntop of this, where a worker walks every core a few times a second, and\nUBSAN caught the first bool it read out of the overrun entry:\n\n UBSAN: invalid-load in drivers/accel/rocket/rocket_devfreq.c:47:10\n load of value 5 is not a valid value for type '_Bool'\n Workqueue: devfreq_wq devfreq_monitor\n\nRecord how many slots were allocated and search all of them. Every core\nis then found on removal, num_cores reaches zero, the device is torn down\nand a later bind starts from a clean rdev.\n\nThis does not make unbinding a single core out of several work. probe\nstill takes num_cores as the slot to fill, so rebinding one core while\nits siblings stay bound would write over a slot that is already in use,\nand rocket_open() still reaches for cores[0] whether or not anything is\nthere. Both of those want more thought than a fix should carry.\n\nFound by unbinding and rebinding all three cores on an Orange Pi 5 Plus.\nWith this applied, 25 unbind/rebind rounds and 5 module unload/reload\nrounds run clean there: the cores land in slots 0, 1 and 2 every time,\nwhichever order they are bound in, and the shared supply goes back to a\nsingle user after each round.","state":0,"publishedAt":"2026-10-28T10:35:42.469+00:00","modifiedAt":"2026-10-28T10:35:42.469+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/accel/rocket/rocket_device.c\",\n \"drivers/accel/rocket/rocket_device.h\",\n \"drivers/accel/rocket/rocket_drv.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ed98261b41687323ffa02ca20fef1e60b38fd1aa\",\n \"lessThan\": \"5078c91f5c84bb383d0a10ed39856f98575e39cf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed98261b41687323ffa02ca20fef1e60b38fd1aa\",\n \"lessThan\": \"134451cf95cb6aa04b725fbfa04e878d072756f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed98261b41687323ffa02ca20fef1e60b38fd1aa\",\n \"lessThan\": \"6eff1d69dae808a1518aee5a58d0853a8db3f1be\",\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 \"drivers/accel/rocket/rocket_device.c\",\n \"drivers/accel/rocket/rocket_device.h\",\n \"drivers/accel/rocket/rocket_drv.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.18\",\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/5078c91f5c84bb383d0a10ed39856f98575e39cf","https://git.kernel.org/stable/c/134451cf95cb6aa04b725fbfa04e878d072756f5","https://git.kernel.org/stable/c/6eff1d69dae808a1518aee5a58d0853a8db3f1be"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99184","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99184","identifiers":["CVE-2026-99184"]},"retained":false,"historicalAffected":[]}],"coverage":[]}