298 lines
16 KiB
JSON
298 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74456",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.900Z",
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"datePublished": "2026-08-15T12:26:58.808Z",
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"dateUpdated": "2026-10-16T19:05:46.867Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-19T16:36:51.237Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error\n\nIn peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc()\nand the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also\nfrees the transfer buffer.\n\nIf usb_submit_urb() fails, the error path frees the buffer explicitly with\nkfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set,\nusb_free_urb() -> urb_destroy() frees the same buffer a second time, a double\nfree of the transfer buffer.\n\n BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0\n Free of addr ffff8881069ccb80 by task trigger.sh/285\n\n Call Trace:\n kfree+0x113/0x3c0\n usb_free_urb.part.0+0x91/0xb0\n\nDrop the redundant kfree(buf); usb_free_urb() already releases the transfer\nbuffer. This mirrors commit 03819abbeb11 (\"net: usb: lan78xx: Fix double free\nissue with interrupt buffer allocation\")."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The flaw is only reached when a privileged local actor brings the PEAK CAN netdev up via rtnetlink/ioctl (peak_usb_ndo_open→peak_usb_start); CAN-bus traffic and remote protocols never call this setup path, but the entry is a local syscall rather than USB packet processing.\nAC:L - Any usb_submit_urb() failure on RX setup deterministically hits the broken error path; an attacker can reliably force -ENODEV/-ENOENT by disconnecting/resetting the adapter or presenting a rogue PEAK-class gadget while repeatedly running ip link set canX up/down.\nPR:L - Bringing the CAN interface up requires CAP_NET_ADMIN on RTM_SETLINK (rtnl_setlink/netif_open), which is Low under CNA guidance; on automotive/industrial diagnostic hosts this is commonly held by technician/service accounts even though unauthenticated remote attackers cannot reach the path.\nUI:N - No separate victim interaction is needed beyond the attacker (or their malware) issuing the privileged link-up that enters peak_usb_start; they can also script repeated up/down cycles while manipulating USB state themselves.\nS:U - The double-free corrupts host kernel kmalloc slab state within the peak_usb driver scope and does not by itself cross a security boundary such as VM escape, container breakout, or IOMMU bypass.\nC:H - This is a kmalloc RX-buffer double-free with URB_FREE_BUFFER set; per CNA guidance such heap double-free/UAF-class bugs enable controlled reallocation and arbitrary kernel memory disclosure, not merely a bounded leak.\nI:H - Freeing the same 64–2048 byte RX slab object twice corrupts SLUB freelist/metadata and provides a standard heap corruption primitive that can be groomed into arbitrary kernel writes or control-flow hijacking.\nA:H - KASAN already reports a double-free in usb_free_urb() on this path; even without full exploitation, allocator corruption typically causes kernel BUG/oops/panic and repeated trigger cycles can deny CAN/USB service on shared diagnostic systems."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/can/usb/peak_usb/pcan_usb_core.c"
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],
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{
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"programFiles": [
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"drivers/net/can/usb/peak_usb/pcan_usb_core.c"
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],
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{
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"status": "affected"
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"version": "0",
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},
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{
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"version": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.1.183",
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},
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},
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},
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"version": "7.1.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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},
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"url": "https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9"
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}
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],
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"title": "can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74456",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:56:58.741801Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:46.867Z"
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}
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}
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]
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}
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} |