CVE-2026-53194

{"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": "2026-10-19T19:57:28.103Z"}, "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", 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"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 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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"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53194", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:26:39.976114Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:57:28.103Z"}}]}}

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Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "Out-of-bounds Write"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:44:36.635Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53194", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:26:39.976114Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:26:40.508Z"}}], "cna": {"title": "USB: serial: kl5kusb105: fix bulk-out buffer overflow", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "60af1fd82983c26604102e63a3fcc822c186cceb", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "0a57320f71941d4e0b1307453c9a1f0939afe666", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "14147b7963685957839c76ba8094924e22777d79", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "a1288cd700f721c1a119c4f1e8efa234e59caada", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "70d86e355c564b5510fde61361df014f5476c83e", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "372f33ebed747d91870f57c0a2e62884a870bffa", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "bde742b076cbe26ecc89c8c68c76ae076a524d02", "versionType": "git"}, {"status": "affected", "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943", "lessThan": "96d47e40bf9db4a9efd5c8fb53287a508d165f14", "versionType": "git"}], "programFiles": ["drivers/usb/serial/kl5kusb105.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.35"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.35", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.94", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.36", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.13", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/serial/kl5kusb105.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "2.6.35"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:00.760Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53194", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:57:28.103Z", "dateReserved": "2026-06-09T07:44:35.390Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-25T08:39:05.017Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:*", "matchCriteriaId": "1039E95A-8CC3-4C88-8FF9-5C08EEB861C9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-53194", "lastModified": "2026-10-19T20:19:08.480", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 1.0, "impactScore": 4.2, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53194", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:26:39.976114Z", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:36.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a57320f71941d4e0b1307453c9a1f0939afe666"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/14147b7963685957839c76ba8094924e22777d79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/372f33ebed747d91870f57c0a2e62884a870bffa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/60af1fd82983c26604102e63a3fcc822c186cceb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70d86e355c564b5510fde61361df014f5476c83e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96d47e40bf9db4a9efd5c8fb53287a508d165f14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a1288cd700f721c1a119c4f1e8efa234e59caada"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bde742b076cbe26ecc89c8c68c76ae076a524d02"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-53194"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492703"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53194.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow", "id": "2492703", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492703"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["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. 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."], "name": "CVE-2026-53194", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53194\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53194\nhttps://lore.kernel.org/linux-cve-announce/2026062558-CVE-2026-53194-8cb6@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,60af1fd82983c26604102e63a3fcc822c186cceb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,0a57320f71941d4e0b1307453c9a1f0939afe666)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,14147b7963685957839c76ba8094924e22777d79)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,a1288cd700f721c1a119c4f1e8efa234e59caada)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,70d86e355c564b5510fde61361df014f5476c83e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,372f33ebed747d91870f57c0a2e62884a870bffa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,bde742b076cbe26ecc89c8c68c76ae076a524d02)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[60b3013cdaf3fa8a17243ca46b19db3cbe08d943,96d47e40bf9db4a9efd5c8fb53287a508d165f14)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.35"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.35)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.259,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.210,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.176,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.94,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T11:00:11.394756+00:00", "updated": "2026-06-28T14:45:17.252450+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}