{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63927", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.021Z", "datePublished": "2026-07-19T14:55:27.864Z", "dateUpdated": "2026-08-05T12:37:22.350Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:22.350Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc2: Fix use after free in debug code\n\nWe're not allowed to dereference \"urb\" after calling\nusb_hcd_giveback_urb() so save the urb->status ahead of time." } ], "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 vulnerable dwc2 HCD urb_dequeue path is reached from local usbfs ioctls (USBDEVFS_SUBMITURB/DISCARDURB) on /dev/bus/usb device nodes, as well as from kernel unlink paths during USB I/O cancellation on dwc2-equipped embedded systems, kiosks, and mobile OTG hosts.\nAC:L - Once debug is enabled, an attacker can reliably drive the path by submitting and cancelling URBs (or forcing disconnect/error unlink storms) and can control the HCD_BH giveback race by running concurrent cancellation requests.\nPR:L - Triggering urb dequeue via usbfs requires only local user access to a USB device node (typically root or plugdev-group membership), which is low privilege and commonly available on dwc2 embedded platforms; no real root in the init namespace is required.\nUI:N - Exploitation requires only the attacker to submit and cancel USB transfers (or insert/disconnect a malicious USB device); no action by a separate victim user is needed.\nS:U - The UAF corrupts kernel heap memory within the kernel's own security authority and does not by itself cross a VM, container, or IOMMU boundary.\nC:H - Use-after-free of a kmalloc-backed struct urb after giveback can be groomed via heap spraying to obtain arbitrary kernel memory read primitives, not merely a bounded leak.\nI:H - UAF on the URB object in the general kmalloc slab enables attacker-controlled reuse of freed memory, supporting control-flow hijack and arbitrary kernel write/code execution.\nA:H - The post-giveback dereference can cause kernel oops/panic during URB teardown, and successful UAF exploitation can crash or hang the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/dwc2/hcd.c" ], "versions": [ { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "d5fc183ed614aeba6779cc992325be560f9a4451", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "63b0dafa676aad4d0c3f01a61ad8e2990907660c", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "9fe1d84f7e2cf33634e8afb7f4b7f8de182dd913", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "0584af4fe40fa5e254a05d69ce658746de641708", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "a15eeeceb94cbc04edef395e4d777ff554bdc27d", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "84ea928ed584756e59c6ac09736f12d1db95ded0", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "6d0b79d1d1118145e48a68192b6d733e39387053", "status": "affected", "versionType": "git" }, { "version": "7359d482eb4d3967cc8be354405ae6be6eaf732c", "lessThan": "9ea06a3fbf9f16e0d98c52cb3b99642be15ec281", "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/usb/dwc2/hcd.c" ], "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "3.10", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d5fc183ed614aeba6779cc992325be560f9a4451" }, { "url": "https://git.kernel.org/stable/c/63b0dafa676aad4d0c3f01a61ad8e2990907660c" }, { "url": "https://git.kernel.org/stable/c/9fe1d84f7e2cf33634e8afb7f4b7f8de182dd913" }, { "url": "https://git.kernel.org/stable/c/0584af4fe40fa5e254a05d69ce658746de641708" }, { "url": "https://git.kernel.org/stable/c/a15eeeceb94cbc04edef395e4d777ff554bdc27d" }, { "url": "https://git.kernel.org/stable/c/84ea928ed584756e59c6ac09736f12d1db95ded0" }, { "url": "https://git.kernel.org/stable/c/6d0b79d1d1118145e48a68192b6d733e39387053" }, { "url": "https://git.kernel.org/stable/c/9ea06a3fbf9f16e0d98c52cb3b99642be15ec281" } ], "title": "usb: dwc2: Fix use after free in debug code", "x_generator": { "engine": "bippy-1.2.0" } } } }