{"id":"CVE-2026-89731","revision":"bbba176ae4af4d66b87c04a7b52b69aa","records":[{"revision":"bbba176ae4af4d66b87c04a7b52b69aa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89731","aliases":[],"title":"cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read\n\ncxl_rch_get_aer_info() copies the RCH Downstream Port AER capability from\nthe RCRB MMIO block using a readl() loop bounded by sizeof(struct\naer_capability_regs). This struct is a software layout and its embedded\nstruct pcie_tlp_log is larger than the on-wire AER capability. As a\nresult the loop reads past the mapped AER register block.\n\nThe over-read also populates the software-only tail fields including\nheader_log.header_len. An out-of-range header_len passed to\npcie_print_tlp_log() can then loop past the header log buffer and cause\na second out-of-bounds read.\n\nThe read was correct when introduced, but struct pcie_tlp_log has since\ngrown (Header Log and TLP Prefix Log sizes, header_len and flit fields),\nso sizeof(struct aer_capability_regs) no longer matches the physical AER\ncapability.\n\nBound the read to the physical AER registers, header through the 16 byte\nHeader Log. Zero the destination first so the software-only fields are\ndeterministic.","state":0,"publishedAt":"2026-09-11T19:46:41.312+00:00","modifiedAt":"2026-10-19T08:51:44.551+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/cxl/core/ras_rch.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab\",\n                            \"lessThan\": \"7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab\",\n                            \"lessThan\": \"8bd3523df1319edc61cd391e695c84a4618516df\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab\",\n                            \"lessThan\": \"8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab\",\n                            \"lessThan\": \"29458e62d0829cbc99435f3e44fd560f9bbf1da7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/cxl/core/ras_rch.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607","https://git.kernel.org/stable/c/8bd3523df1319edc61cd391e695c84a4618516df","https://git.kernel.org/stable/c/8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced","https://git.kernel.org/stable/c/29458e62d0829cbc99435f3e44fd560f9bbf1da7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89731","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89731","identifiers":["CVE-2026-89731"]},"retained":false,"historicalAffected":[]}],"coverage":[]}