{"id":"CVE-2026-98025","summary":"net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow\n\nThe 0xffff length sentinel detects a router reboot and schedules\nre-enabling of ethernet mode, but then falls through to the rest\nof the loop body.  The next check is\n\n\t} else if (len \u003e CX82310_MTU) {\n\nwhich is the else of the just-matched if -- it never fires for\nlen == 0xffff.  The MTU bound that normally caps the\nincomplete-packet save path is silently bypassed.\n\nWith 0xffff \u003e skb-\u003elen always true (rx_urb_size is 4096), the\nincomplete-packet branch saves dev-\u003epartial_len = skb-\u003elen bytes\ninto dev-\u003epartial_data.  partial_data is kmalloc(hard_mtu) =\nkmalloc(CX82310_MTU + 2) = 1516 bytes, but skb-\u003elen after the\n2-byte header pull can be up to 4094.  A device that sends a\n4096-byte URB starting with [0xff 0xff] therefore copies 4094\ndevice-provided bytes into a buffer allocated for 1516 bytes,\nexceeding its requested size by 2578 bytes.\n\nThe next URB then reads dev-\u003epartial_len (4094) back from the same\n1516-byte buffer and dev-\u003epartial_rem (65535 - 4094 = 61441) from\nthe new URB's ~4KB skb, both well past their allocations, and\ndelivers the spliced result as a 64KB \"frame\" to the network\nstack.\n\nBail out of rx_fixup after scheduling the re-enable work; the\nremainder of a reboot-marker URB is not meaningful packet data.\nThis restores the invariant that partial_len \u003c CX82310_MTU + 2 on\nthe save path, since every other route there has already passed\nthe MTU check.","modified":"2026-11-13T04:07:22.565923198Z","published":"2026-09-25T10:23:43.906Z","related":["SUSE-SU-2026:24550-1","SUSE-SU-2026:24619-1","SUSE-SU-2026:24643-1","SUSE-SU-2026:24648-1","SUSE-SU-2026:24651-1","SUSE-SU-2026:24662-1","SUSE-SU-2026:5091-1","openSUSE-SU-2026:12074-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98025.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00520cdd21ea6a9b5dc8d53bbd241620d2059554"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0dbc89e664b4609ad672b5bdeef60df251294b8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"},{"type":"WEB","url":"https://git.kernel.org/stable/c/59bf9e94bdc49557f07d87164269daff7340f4d6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0c1ce6ef4cefe568e19afa83f543caa3c3c0873"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98025.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98025"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808"},{"fixed":"d0c1ce6ef4cefe568e19afa83f543caa3c3c0873"},{"fixed":"0dbc89e664b4609ad672b5bdeef60df251294b8f"},{"fixed":"00520cdd21ea6a9b5dc8d53bbd241620d2059554"},{"fixed":"59bf9e94bdc49557f07d87164269daff7340f4d6"},{"fixed":"3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"},{"fixed":"659654654eb140851467af41d610473c100c7975"},{"fixed":"237c9ae7145772af147e4665f158938350fa5658"},{"fixed":"5d50e90add8b4a978395e893e81954d19d58a7c5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c1b187a86a176e42f5e48066556980e3232b6cab"}]}],"versions":["v4.19.325","v4.19.324","v4.19.323","v4.19.322","v5.4.302","v5.4.301","v5.4.300","v5.4.299","v5.4.298","v5.4.297","v5.4.296","v5.4.295","v5.4.294","v5.4.293","v5.4.292","v5.4.291","v5.4.290","v5.4.289","v5.4.288","v5.4.287","v5.4.286","v5.4.285","v5.4.284"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98025.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.322"},{"fixed":"4.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.4.284"},{"fixed":"5.5"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98025.json"}}],"schema_version":"1.9.2"}