{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-31393", "tracking": { "current_release_date": "2026-04-03T16:53:56.498662Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31393", "initial_release_date": "2026-04-03T15:39:18.485422Z", "revision_history": [ { "date": "2026-04-03T15:39:18.485422Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products created (6).| Products connected (8).| References created (6)." }, { "date": "2026-04-03T15:39:28.827232Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-04-03T16:50:11.626855Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (6)." } ], "status": "interim", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<3b646516cba2ebc4b51a72954903326e7c1e443f", "product": { "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<3b646516cba2ebc4b51a72954903326e7c1e443f", "product_id": "CSAFPID-5992208" } }, { "category": "product_version_range", "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<807bd1258453c4c83f6ae9dbc1e7b44860ff40d0", "product": { "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<807bd1258453c4c83f6ae9dbc1e7b44860ff40d0", "product_id": "CSAFPID-5992209" } }, { "category": "product_version_range", "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<9aeacde4da0f02d42fd968fd32f245828b230171", "product": { "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|<9aeacde4da0f02d42fd968fd32f245828b230171", "product_id": "CSAFPID-5992210" } }, { "category": "product_version_range", "name": "vers:git/4e8402a3f884427f9233ba436459c158d1f2e114|data without verifying that the payload is present:\n\n - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads\n 4 bytes past the header (needs cmd_len >= 8).\n\n - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header\n (needs cmd_len >= 5).\n\nA truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an\nout-of-bounds read of adjacent skb data.\n\nGuard each data access with the required payload length check. If the\npayload is too short, skip the read and let the state machine complete\nwith safe defaults (feat_mask and remote_fixed_chan remain zero from\nkzalloc), so the info timer cleanup and l2cap_conn_start() still run\nand the connection is not stalled.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31393.json" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access\n\nl2cap_information_rsp() checks that cmd_len covers the fixed\nl2cap_info_rsp header (type + result, 4 bytes) but then reads\nrsp->data without verifying that the payload is present:\n\n - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads\n 4 bytes past the header (needs cmd_len >= 8).\n\n - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header\n (needs cmd_len >= 5).\n\nA truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an\nout-of-bounds read of adjacent skb data.\n\nGuard each data access with the required payload length check. If the\npayload is too short, skip the read and let the state machine complete\nwith safe defaults (feat_mask and remote_fixed_chan remain zero from\nkzalloc), so the info timer cleanup and l2cap_conn_start() still run\nand the connection is not stalled.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31393" }, { "category": "other", "text": "4.1", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent CVSS (V3) score, Is related to a product by vendor Linux", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-1289721", "CSAFPID-5992208", "CSAFPID-5992209", "CSAFPID-5992210", "CSAFPID-5992211", "CSAFPID-5992212", "CSAFPID-5992213" ], "known_not_affected": [ "CSAFPID-1289722", "CSAFPID-5904647", "CSAFPID-5904654", "CSAFPID-5904671", "CSAFPID-5905005", "CSAFPID-5905006", "CSAFPID-5905027" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31393.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31393" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101" } ], "title": "CVE-2026-31393" } ] }