{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31758", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.139Z", "datePublished": "2026-05-01T14:14:48.390Z", "dateUpdated": "2026-08-05T12:24:58.211Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:58.211Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usbtmc: Flush anchored URBs in usbtmc_release\n\nWhen calling usbtmc_release, pending anchored URBs must be flushed or\nkilled to prevent use-after-free errors (e.g. in the HCD giveback\npath). Call usbtmc_draw_down() to allow anchored URBs to be completed." } ], "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 path is reached through local syscalls on the registered /dev/usbtmc* character device: open, asynchronous ioctl/read/write submission, then release. A USBTMC device must be present, but exploitation is driven from local device-file operations rather than network traffic.\nAC:L - The attacker can deliberately submit asynchronous URBs and drop the file reference before completion; the missing release-time drawdown makes the UAF deterministic enough to trigger. Any completion timing needed can be influenced by repeated attempts and, in the strongest scenario, by a controlled USBTMC device.\nPR:L - There are no capability or namespace-sensitive privilege checks in the usbtmc open/ioctl/release path. The attacker only needs ordinary local access sufficient to open the /dev/usbtmc* node.\nUI:N - No separate victim action is required once the attacker can access the device node. The attacker can open the file, issue the async operation, and cause release themselves.\nS:U - The corruption occurs within kernel USB/driver memory and affects the same kernel security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - This is a use-after-free of per-file kernel state containing embedded USB anchors and callback context. Per the kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - The HCD giveback path and completion callbacks write through freed file_data/anchor memory, giving a heap corruption primitive. UAF corruption is defensibly scored as high integrity impact because it can support arbitrary write or control-flow exploitation.\nA:H - Syzbot reproduced a KASAN slab-use-after-free write in the USB giveback path after usbtmc_release freed the object. Even without full exploitation, this can crash or destabilize the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/class/usbtmc.c" ], "versions": [ { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "959ef329071136e4335b54822fe2f607659b4569", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "e189d443767f7cd390c52f2e122e1fc41c7562d6", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "95e09b07e50290254b28b8395509473104518f8c", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "977b632db51d231dec0bc571089a5c2402674139", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "d40198de50232e04c14c6e2092e896766c95ea48", "status": "affected", "versionType": "git" }, { "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "8a768552f7a8276fb9e01d49773d2094ace7c8f1", "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/class/usbtmc.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "4.19", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.134" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.22" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.19.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/959ef329071136e4335b54822fe2f607659b4569" }, { "url": "https://git.kernel.org/stable/c/e189d443767f7cd390c52f2e122e1fc41c7562d6" }, { "url": "https://git.kernel.org/stable/c/7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f" }, { "url": "https://git.kernel.org/stable/c/95e09b07e50290254b28b8395509473104518f8c" }, { "url": "https://git.kernel.org/stable/c/d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1" }, { "url": "https://git.kernel.org/stable/c/977b632db51d231dec0bc571089a5c2402674139" }, { "url": "https://git.kernel.org/stable/c/d40198de50232e04c14c6e2092e896766c95ea48" }, { "url": "https://git.kernel.org/stable/c/8a768552f7a8276fb9e01d49773d2094ace7c8f1" } ], "title": "usb: usbtmc: Flush anchored URBs in usbtmc_release", "x_generator": { "engine": "bippy-1.2.0" } } } }