{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64585", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-06T07:06:26.556Z", "dateUpdated": "2026-08-23T12:45:43.597Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:45:43.597Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: esd_usb: kill anchored URBs before freeing netdevs\n\nesd_usb_disconnect() frees each CAN netdev with free_candev() inside\nits per-netdev loop and only calls unlink_all_urbs(dev) afterwards.\nThe per-netdev private data (struct esd_usb_net_priv) is embedded in\nthe net_device allocation returned by alloc_candev(), so once\nfree_candev() has run, dev->nets[i] points to freed memory.\nunlink_all_urbs() then dereferences the freed dev->nets[i] to kill the\nper-netdev TX anchor (usb_kill_anchored_urbs(&priv->tx_submitted)),\nclear active_tx_jobs, and reset priv->tx_contexts[].\n\nReorder the teardown so the anchored URBs are killed before the netdevs\nare freed, matching other CAN/USB drivers in the same directory such as\nems_usb, usb_8dev and mcba_usb, which unregister, then unlink, then\nfree: unregister the netdevs first (which stops their TX queues), call\nunlink_all_urbs(dev) once, then free the netdevs.\n\nThis issue was found by an in-house static analysis tool." } ], "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 UAF is reached by forcing esd_usb_disconnect() via local usbfs USBDEVFS_DISCONNECT, sysfs unbind, or USB emulation, not by network/CAN traffic; this matches AV:L scoring of analogous USB disconnect UAFs (e.g. CVE-2025-40283).\nAC:L - Once disconnect runs, free_candev() then unlink_all_urbs() deterministically uses freed esd_usb_net_priv in the same teardown path; the attacker fully controls when unbind occurs, with no attacker-uncontrollable race required.\nPR:L - A basic local account with write access to the USB device node (plugdev/uaccess or USB passthrough) can issue USBDEVFS_DISCONNECT; that path has no CAP_SYS_ADMIN check, so init-namespace root is not required.\nUI:N - The attacker issues disconnect/unbind against an already-bound esd CAN-USB interface (or their own matching VID/PID device) without any separate victim action.\nS:U - The freed netdev-private object and subsequent URB teardown run entirely within the host kernel security authority; this is not a VM, IOMMU, or sandbox boundary escape.\nC:H - Use-after-free of struct esd_usb_net_priv (embedded in the freed candev) lets a reclaimed object supply attacker-controlled pointer-rich state read through usb_kill_anchored_urbs() and related teardown, enabling kernel disclosure.\nI:H - unlink_all_urbs() writes through the freed priv (usb_kill_anchored_urbs on tx_submitted, atomic_set of active_tx_jobs, and tx_contexts[] resets), giving a heap UAF write primitive suitable for control-flow hijack.\nA:H - Dereferencing the freed per-netdev private data during disconnect reliably causes kernel oops/panic, and the attacker can repeat unbind/rebind to re-trigger the crash." } ] } ], "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/esd_usb.c" ], "versions": [ { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "d12f6add48f2da15c8c8281961d3faad804c76cf", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "aa1d005927db38af783c1a4a8a00a39e0229ab2d", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "a02e1d8f191324583599544d54e59e6a2b74bb0e", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "a3314f10369df70925140f59bbe069718f65a0b9", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "765ba1c91823a296447528791b89a6504947fd5c", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "5832c55b3c824ba2fe9c36ac3c411baddcce053e", "status": "affected", "versionType": "git" }, { "version": "96d8e90382dc336b5de401164597edfdc2e8d9f1", "lessThan": "c43122fef328a70045fe7621c06de6b2b8e19264", "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/esd_usb.c" ], "versions": [ { "version": "2.6.36", "status": "affected" }, { "version": "0", "lessThan": "2.6.36", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "2.6.36", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d12f6add48f2da15c8c8281961d3faad804c76cf" }, { "url": "https://git.kernel.org/stable/c/aa1d005927db38af783c1a4a8a00a39e0229ab2d" }, { "url": "https://git.kernel.org/stable/c/a02e1d8f191324583599544d54e59e6a2b74bb0e" }, { "url": "https://git.kernel.org/stable/c/a3314f10369df70925140f59bbe069718f65a0b9" }, { "url": "https://git.kernel.org/stable/c/765ba1c91823a296447528791b89a6504947fd5c" }, { "url": "https://git.kernel.org/stable/c/5832c55b3c824ba2fe9c36ac3c411baddcce053e" }, { "url": "https://git.kernel.org/stable/c/c43122fef328a70045fe7621c06de6b2b8e19264" } ], "title": "can: esd_usb: kill anchored URBs before freeing netdevs", "x_generator": { "engine": "bippy-1.2.0" } } } }