{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74456", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.900Z", "datePublished": "2026-08-15T12:26:58.808Z", "dateUpdated": "2026-08-19T16:36:51.237Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:51.237Z" }, "descriptions": [ { "lang": "en", "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\")." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/can/usb/peak_usb/pcan_usb_core.c" ], "versions": [ { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "914c3b8fa175acf8476ad31cf04e308638e3578e", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "5f2fa5840c34d3a558c57855781be75e03bef752", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "b9088d581fff971a7eb1628f8dcc30df6cfef4dc", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "525640b93d3e5f82f4ebea4730f4e0cf799522ba", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "4bb3325075138dd5346b71589a959878b564dc0b", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "92d0de80ca2223b9c7da78020155b6cb27824cc0", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "dfb17bf04a764462000f11258a7c06aa92d1f261", "status": "affected", "versionType": "git" }, { "version": "bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d", "lessThan": "9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9", "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/can/usb/peak_usb/pcan_usb_core.c" ], "versions": [ { "version": "3.4", "status": "affected" }, { "version": "0", "lessThan": "3.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "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": "3.4", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e" }, { "url": "https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752" }, { "url": "https://git.kernel.org/stable/c/b9088d581fff971a7eb1628f8dcc30df6cfef4dc" }, { "url": "https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba" }, { "url": "https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b" }, { "url": "https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0" }, { "url": "https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261" }, { "url": "https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9" } ], "title": "can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error", "x_generator": { "engine": "bippy-1.2.0" } } } }