{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64547", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.795Z", "datePublished": "2026-07-27T20:10:37.786Z", "dateUpdated": "2026-08-17T04:57:24.361Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:24.361Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: net1080: validate packet_len before pad-byte access in rx_fixup\n\nFor an even packet_len, net1080_rx_fixup() reads the pad byte at\nskb->data[packet_len] before the skb->len != packet_len check further\ndown, and packet_len is only bounded against NC_MAX_PACKET. A malicious\nNetChip 1080 device can send a short frame advertising a large even\npacket_len (e.g. 0x4000), so the pad-byte read lands past the end of the\nskb:\n\n BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup\n Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14\n ...\n net1080_rx_fixup (drivers/net/usb/net1080.c:384)\n usbnet_bh (drivers/net/usb/usbnet.c:1589)\n process_one_work (kernel/workqueue.c:3322)\n bh_worker (kernel/workqueue.c:3708)\n tasklet_action (kernel/softirq.c:965)\n handle_softirqs (kernel/softirq.c:622)\n ...\n\nReject the frame when packet_len >= skb->len before reading." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - net1080 implements a point-to-point Ethernet link over a USB host-to-host cable, so the malformed NC frame originates from the logically adjacent peer host/device on that link rather than from a local user; a compromised peer (or a gadget-mode board presenting 0525:1080, which autoloads the default-y driver) sends the frame over an already-established link with no physical interaction at attack time.\nAC:L - The attacker fully and deterministically controls packet_len and the frame length in every received frame, so the out-of-bounds read is triggered on demand with no race, no timing dependency, and no reliance on memory layout the attacker cannot influence.\nPR:N - The rx path runs in softirq/workqueue context on every received URB with no authentication, no capability check, and no local account on the target; USB/link-level peers are entirely untrusted and ungated.\nUI:N - The driver binds automatically via MODULE_DEVICE_TABLE and processes frames in usbnet_bh without any user action; on an already-connected host-to-host cable the victim does nothing at all.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The attacker controls the read offset across a ~32 KB range past a 1523-byte slab/page-frag object, and the comparison outcome is leaked back over the wire because only the matching path reaches nc_ensure_sync()'s vendor control transfer, yielding a repeatable oracle for probing kernel heap contents rather than a bounded few-byte read.\nI:N - The path performs only a one-byte read; the subsequent skb->len != packet_len check still rejects the frame, and the skb_trim calls on the underflow paths are no-ops, so no kernel memory or network data is modified.\nA:H - The read reaches roughly 31 KB beyond the allocation, which can cross into a KFENCE guard page, an unmapped hole, or a page-frag boundary and oops in softirq context, and on KASAN/panic_on_warn hardened kernels it panics the machine outright — repeatable per frame." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/usb/net1080.c" ], "versions": [ { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "f42217fa7d535e9ec4151f7971f06f6ea65e850a", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "c087749815379e9af2fdbeb08bfc33870b103958", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "e4a87126c085b097d29e17e3b7647295bba8be7c", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "685e92934f11d5e215dad58813e2f9955ac2f436", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "4dc8484be3302d187274364820d3bef6c62bde32", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "b153cfe84b1340c69a13d0957665a2bfcf21239c", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "ea866cab12db1a2100b400a8b03569e5bc0ee29a", "status": "affected", "versionType": "git" }, { "version": "904813cd8a0b334189da285bb05af0b18b062502", "lessThan": "03f384bc0cb8d4a1301d4f5b0baef2d980258383", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/usb/net1080.c" ], "versions": [ { "version": "2.6.14", "status": "affected" }, { "version": "0", "lessThan": "2.6.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f42217fa7d535e9ec4151f7971f06f6ea65e850a" }, { "url": "https://git.kernel.org/stable/c/c087749815379e9af2fdbeb08bfc33870b103958" }, { "url": "https://git.kernel.org/stable/c/e4a87126c085b097d29e17e3b7647295bba8be7c" }, { "url": "https://git.kernel.org/stable/c/685e92934f11d5e215dad58813e2f9955ac2f436" }, { "url": "https://git.kernel.org/stable/c/4dc8484be3302d187274364820d3bef6c62bde32" }, { "url": "https://git.kernel.org/stable/c/b153cfe84b1340c69a13d0957665a2bfcf21239c" }, { "url": "https://git.kernel.org/stable/c/ea866cab12db1a2100b400a8b03569e5bc0ee29a" }, { "url": "https://git.kernel.org/stable/c/03f384bc0cb8d4a1301d4f5b0baef2d980258383" } ], "title": "net: usb: net1080: validate packet_len before pad-byte access in rx_fixup", "x_generator": { "engine": "bippy-1.2.0" } } } }