{"id":"CVE-2026-98025","revision":"14956452323140c2a803e226fd9f0b02","records":[{"revision":"14956452323140c2a803e226fd9f0b02","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98025","aliases":[],"title":"net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow","description":"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 > 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 > skb->len always true (rx_urb_size is 4096), the\nincomplete-packet branch saves dev->partial_len = skb->len bytes\ninto dev->partial_data.  partial_data is kmalloc(hard_mtu) =\nkmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len 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->partial_len (4094) back from the same\n1516-byte buffer and dev->partial_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 < CX82310_MTU + 2 on\nthe save path, since every other route there has already passed\nthe MTU check.","state":0,"publishedAt":"2026-09-25T10:23:43.906+00:00","modifiedAt":"2026-10-19T09:12:30.354+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/usb/cx82310_eth.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"d0c1ce6ef4cefe568e19afa83f543caa3c3c0873\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"0dbc89e664b4609ad672b5bdeef60df251294b8f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"00520cdd21ea6a9b5dc8d53bbd241620d2059554\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"59bf9e94bdc49557f07d87164269daff7340f4d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"659654654eb140851467af41d610473c100c7975\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"237c9ae7145772af147e4665f158938350fa5658\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808\",\n                            \"lessThan\": \"5d50e90add8b4a978395e893e81954d19d58a7c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c1b187a86a176e42f5e48066556980e3232b6cab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.19.322\",\n                            \"lessThan\": \"4.20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.284\",\n                            \"lessThan\": \"5.5\",\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/usb/cx82310_eth.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\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/d0c1ce6ef4cefe568e19afa83f543caa3c3c0873","https://git.kernel.org/stable/c/0dbc89e664b4609ad672b5bdeef60df251294b8f","https://git.kernel.org/stable/c/00520cdd21ea6a9b5dc8d53bbd241620d2059554","https://git.kernel.org/stable/c/59bf9e94bdc49557f07d87164269daff7340f4d6","https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287","https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975","https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658","https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98025","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98025","identifiers":["CVE-2026-98025"]},"retained":false,"historicalAffected":[]}],"coverage":[]}