{"api_version":"1","generated_at":"2026-08-20T18:50:18+00:00","cve":"CVE-2026-74456","urls":{"html":"https://cve.report/CVE-2026-74456","api":"https://cve.report/api/cve/CVE-2026-74456.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74456","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74456"},"summary":{"title":"can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error","description":"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\").","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:50","updated_at":"2026-08-19 17:21:02"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/b9088d581fff971a7eb1628f8dcc30df6cfef4dc","name":"https://git.kernel.org/stable/c/b9088d581fff971a7eb1628f8dcc30df6cfef4dc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752","name":"https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9","name":"https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba","name":"https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0","name":"https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b","name":"https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e","name":"https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261","name":"https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74456","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74456","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d 914c3b8fa175acf8476ad31cf04e308638e3578e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d 5f2fa5840c34d3a558c57855781be75e03bef752 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d b9088d581fff971a7eb1628f8dcc30df6cfef4dc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d 525640b93d3e5f82f4ebea4730f4e0cf799522ba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74456","cve":"CVE-2026-74456","epss":"0.001290000","percentile":"0.029420000","score_date":"2026-08-19","updated_at":"2026-08-20 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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":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-19T16:36:51.237Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74456","datePublished":"2026-08-15T12:26:58.808Z","dateReserved":"2026-08-15T05:44:03.900Z","dateUpdated":"2026-08-19T16:36:51.237Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:50","lastModifiedDate":"2026-08-19 17:21:02","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74456","Ordinal":"1","Title":"can: peak_usb: peak_usb_start(): fix double free of transfer buf","CVE":"CVE-2026-74456","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74456","Ordinal":"1","NoteData":"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\").","Type":"Description","Title":"can: peak_usb: peak_usb_start(): fix double free of transfer buf"}]}}}