{"id":"CVE-2026-74456","title":"can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error","summary":"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()\nan…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 914c3b8fa175acf8476ad31cf04e308638e3578e","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 5f2fa5840c34d3a558c57855781be75e03bef752","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < b9088d581fff971a7eb1628f8dcc30df6cfef4dc","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 525640b93d3e5f82f4ebea4730f4e0cf799522ba","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 4bb3325075138dd5346b71589a959878b564dc0b","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 92d0de80ca2223b9c7da78020155b6cb27824cc0","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < dfb17bf04a764462000f11258a7c06aa92d1f261","Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9","Linux 3.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:56:58.741801Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:46.867Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74456","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"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02273,"ingestedAt":"2026-10-16T19:46:24.360Z","slug":"CVE-2026-74456","body":"## Overview\n\nIn 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\").\n\n## Affected\n\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 914c3b8fa175acf8476ad31cf04e308638e3578e`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 5f2fa5840c34d3a558c57855781be75e03bef752`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < b9088d581fff971a7eb1628f8dcc30df6cfef4dc`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 525640b93d3e5f82f4ebea4730f4e0cf799522ba`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 4bb3325075138dd5346b71589a959878b564dc0b`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 92d0de80ca2223b9c7da78020155b6cb27824cc0`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < dfb17bf04a764462000f11258a7c06aa92d1f261`\n- `Linux >= bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d < 9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9`\n- `Linux 3.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}