{"api_version":"1","generated_at":"2026-09-25T22:18:41+00:00","cve":"CVE-2026-98025","urls":{"html":"https://cve.report/CVE-2026-98025","api":"https://cve.report/api/cve/CVE-2026-98025.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98025","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98025"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:31","updated_at":"2026-09-25 11:17:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975","name":"https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287","name":"https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658","name":"https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5","name":"https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98025","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98025","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 659654654eb140851467af41d610473c100c7975 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 237c9ae7145772af147e4665f158938350fa5658 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 5d50e90add8b4a978395e893e81954d19d58a7c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c1b187a86a176e42f5e48066556980e3232b6cab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.322 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.284 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/usb/cx82310_eth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287","status":"affected","version":"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808","versionType":"git"},{"lessThan":"659654654eb140851467af41d610473c100c7975","status":"affected","version":"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808","versionType":"git"},{"lessThan":"237c9ae7145772af147e4665f158938350fa5658","status":"affected","version":"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808","versionType":"git"},{"lessThan":"5d50e90add8b4a978395e893e81954d19d58a7c5","status":"affected","version":"ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808","versionType":"git"},{"status":"affected","version":"5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb","versionType":"git"},{"status":"affected","version":"c1b187a86a176e42f5e48066556980e3232b6cab","versionType":"git"},{"lessThan":"4.20","status":"affected","version":"4.19.322","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.284","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/usb/cx82310_eth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.10"},{"lessThan":"5.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.322","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.284","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:43.906Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"},{"url":"https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975"},{"url":"https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658"},{"url":"https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5"}],"title":"net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98025","datePublished":"2026-09-25T10:23:43.906Z","dateReserved":"2026-09-25T10:19:56.070Z","dateUpdated":"2026-09-25T10:23:43.906Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:31","lastModifiedDate":"2026-09-25 11:17:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98025","Ordinal":"1","Title":"net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to ","CVE":"CVE-2026-98025","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98025","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to "}]}}}