{"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"}}}}