{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53194", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.390Z", "datePublished": "2026-06-25T08:39:05.017Z", "dateUpdated": "2026-08-05T12:34:00.760Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:00.760Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: kl5kusb105: fix bulk-out buffer overflow\n\nklsi_105_prepare_write_buffer() is called by the generic write path\nwith the bulk-out buffer and its size (bulk_out_size, 64 bytes). It\nstores a two-byte length header at the start of the buffer and copies\nthe payload from the write fifo starting at buf + KLSI_HDR_LEN, but\npasses the full buffer size as the number of bytes to copy:\n\n count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN,\n size, &port->lock);\n\nWhen the fifo holds at least size bytes, size bytes are copied starting\ntwo bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its\nend. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for\nthe header as safe_serial already does.\n\nWriting bulk_out_size or more bytes to the tty triggers a slab\nout-of-bounds write, observed with KASAN by emulating the device with\ndummy_hcd and raw-gadget:\n\n BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0\n Write of size 64 at addr ffff888112c62202 by task python3\n kfifo_copy_out\n klsi_105_prepare_write_buffer [kl5kusb105]\n usb_serial_generic_write_start [usbserial]\n Allocated by task 139:\n usb_serial_probe [usbserial]\n The buggy address is located 2 bytes inside of allocated 64-byte region\n\nThe out-of-bounds write no longer occurs with this change applied." } ], "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 - Although this is USB serial code, the vulnerable copy is reached by a local write to the registered /dev/ttyUSB device once a matching adapter is present.\nAC:L - Writing bulk_out_size or more bytes deterministically fills the FIFO and triggers the out-of-bounds copy; no race or attacker-uncontrolled timing is required.\nPR:L - There is no capability or authentication check in the tty/USB-serial write path, but the attacker needs local access to open and write the tty device.\nUI:N - The attacker can trigger the bug directly by writing to the tty device; no separate victim action is required.\nS:U - The corruption occurs within the host kernel and does not cross a VM, IOMMU, or similar security authority boundary.\nC:H - The bug is kernel heap memory corruption, and the overlong bulk-out URB may also expose adjacent heap bytes to the USB device.\nI:H - The attacker controls the data copied past the 64-byte bulk-out buffer, making this an out-of-bounds kernel heap write.\nA:H - The issue was observed as a KASAN slab out-of-bounds write and can reasonably cause kernel memory corruption, oops, or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/serial/kl5kusb105.c" ], "versions": [ { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "60af1fd82983c26604102e63a3fcc822c186cceb", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "0a57320f71941d4e0b1307453c9a1f0939afe666", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "14147b7963685957839c76ba8094924e22777d79", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "a1288cd700f721c1a119c4f1e8efa234e59caada", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "70d86e355c564b5510fde61361df014f5476c83e", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "372f33ebed747d91870f57c0a2e62884a870bffa", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "bde742b076cbe26ecc89c8c68c76ae076a524d02", "status": "affected", "versionType": "git" }, { "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "96d47e40bf9db4a9efd5c8fb53287a508d165f14", "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/serial/kl5kusb105.c" ], "versions": [ { "version": "2.6.35", "status": "affected" }, { "version": "0", "lessThan": "2.6.35", "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": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "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": "2.6.35", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/60af1fd82983c26604102e63a3fcc822c186cceb" }, { "url": "https://git.kernel.org/stable/c/0a57320f71941d4e0b1307453c9a1f0939afe666" }, { "url": "https://git.kernel.org/stable/c/14147b7963685957839c76ba8094924e22777d79" }, { "url": "https://git.kernel.org/stable/c/a1288cd700f721c1a119c4f1e8efa234e59caada" }, { "url": "https://git.kernel.org/stable/c/70d86e355c564b5510fde61361df014f5476c83e" }, { "url": "https://git.kernel.org/stable/c/372f33ebed747d91870f57c0a2e62884a870bffa" }, { "url": "https://git.kernel.org/stable/c/bde742b076cbe26ecc89c8c68c76ae076a524d02" }, { "url": "https://git.kernel.org/stable/c/96d47e40bf9db4a9efd5c8fb53287a508d165f14" } ], "title": "USB: serial: kl5kusb105: fix bulk-out buffer overflow", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "affected": [ { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:6" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "affected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "affected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" } ], "datePublic": "2026-06-25T00:00:00.000Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in the Linux kernel's `kl5kusb105` USB serial driver. This buffer overflow vulnerability allows a local attacker to write data beyond the intended memory boundary (if attacker controls USB device or driver, because triggered from the internals of the device). By sending a specially crafted input to the USB serial port, an attacker can trigger an out-of-bounds write, which may lead to memory corruption. The primary consequence of this flaw is a denial of service (DoS), potentially causing system instability or crashes." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Moderate" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-787", "description": "Out-of-bounds Write", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-53194" }, { "name": "RHBZ#2492703", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492703" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53194.json" } ], "timeline": [ { "lang": "en", "time": "2026-06-25T00:00:00.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-06-25T00:00:00.000Z", "value": "Made public." } ], "title": "kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, prevent module kl5kusb105 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:44:36.635Z" } } ] } }