{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-53208-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-25T12:52:47Z", "generator": { "date": "2026-08-25T12:52:47Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-53208-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-06-25T09:16:00Z", "revision_history": [ { "date": "2026-06-25T09:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:52:47Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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"category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-53208", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: reject BR/EDR signaling packets over MTUsig\n\nnet/bluetooth/l2cap_core.c:l2cap_sig_channel() accepts BR/EDR\nsignaling packets up to the channel MTU and dispatches each command\nwithout enforcing the signaling MTU (MTUsig). A Bluetooth BR/EDR peer\nwithin radio range can send a fixed-channel CID 0x0001 packet that is\nlarger than MTUsig and contains many L2CAP_ECHO_REQ commands before\npairing. In a real-radio stock-kernel run, one 681-byte signaling\npacket containing 168 zero-length ECHO_REQ commands made the target\ntransmit 168 ECHO_RSP frames over about 220 ms.\n\nImpact: a Bluetooth BR/EDR peer within radio range, before pairing, can\nforce 168 ECHO_RSP frames from one 681-byte fixed-channel signaling\npacket containing packed ECHO_REQ commands.\n\nDefine Linux's BR/EDR signaling MTU as the spec minimum of 48 bytes and\nreject any larger signaling packet with one L2CAP_COMMAND_REJECT_RSP\ncarrying L2CAP_REJ_MTU_EXCEEDED before any command is dispatched.\n\nThe Bluetooth Core spec wording for MTUExceeded says the reject\nidentifier shall match the first request command in the packet, and\nthat packets containing only responses shall be silently discarded.\nLinux intentionally deviates from that prescription: silently\ndiscarding desynchronizes the peer because the remote stack never\nlearns its responses were dropped, and locating the first request\ncommand requires walking command headers past MTUsig, i.e. processing\nbytes from a packet we have already decided is too large to process.\nWe therefore always emit one reject and use the identifier from the\nfirst command header, a single fixed-offset byte read.\n\nThe unrestricted BR/EDR signaling parser and ECHO_REQ response path both\ntrace to the initial git import; no later introducing commit is\navailable for a Fixes tag.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-53208" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/214a2042b16b3c8d798a8b9ef9f36094f13a9859", "url": "https://git.kernel.org/stable/c/214a2042b16b3c8d798a8b9ef9f36094f13a9859" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a8335f3db15bd1e0e82e0db5d488fabc7d10d1ab", "url": "https://git.kernel.org/stable/c/a8335f3db15bd1e0e82e0db5d488fabc7d10d1ab" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b20e8a98dd29b121f58fcdf51e8576119aba536a", "url": "https://git.kernel.org/stable/c/b20e8a98dd29b121f58fcdf51e8576119aba536a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dd214733544427587a95f66dbf3adff072568990", "url": "https://git.kernel.org/stable/c/dd214733544427587a95f66dbf3adff072568990" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dedc92b96dc1d8919a3bdf2495ede68922ef7ebc", "url": "https://git.kernel.org/stable/c/dedc92b96dc1d8919a3bdf2495ede68922ef7ebc" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e05c4ac575b457978a7ef441053394169084869c", "url": "https://git.kernel.org/stable/c/e05c4ac575b457978a7ef441053394169084869c" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e2b8acf9405bd9b1baf1c54dc897b0905db689bf", "url": "https://git.kernel.org/stable/c/e2b8acf9405bd9b1baf1c54dc897b0905db689bf" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fa5823126239b3e453fac1a2fe50726c7f4a55e1", "url": "https://git.kernel.org/stable/c/fa5823126239b3e453fac1a2fe50726c7f4a55e1" } ], "release_date": "2026-06-25T09:16:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-08-22T13:26:07.964945Z", "details": "The debian10els kernel is not affected by CVE-2026-53208: the vulnerable code was never introduced into this branch.", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ] } ] }