{"id":"CVE-2026-89731","title":"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…","summary":"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…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab < 7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607","Linux >= 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab < 8bd3523df1319edc61cd391e695c84a4618516df","Linux >= 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab < 8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced","Linux >= 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab < 29458e62d0829cbc99435f3e44fd560f9bbf1da7","Linux 6.7"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:26.173","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89731","references":[{"url":"https://git.kernel.org/stable/c/29458e62d0829cbc99435f3e44fd560f9bbf1da7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8bd3523df1319edc61cd391e695c84a4618516df","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89731.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89731"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532462"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89731"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89731"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89731.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00159,"epssPercentile":0.05514,"ingestedAt":"2026-09-14T15:23:07.472Z","cwe":["CWE-125"],"scores":{"nvd":7.1,"vendor":5.5},"slug":"CVE-2026-89731","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89731.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":197696,"id":"CVE-2026-89731","ts":1789384318448,"field":"cvss","old":"4.7","new":"7.1"},{"seq":197695,"id":"CVE-2026-89731","ts":1789384318448,"field":"severity","old":"medium","new":"high"},{"seq":183837,"id":"CVE-2026-89731","ts":1789356677614,"field":"cvss","old":"7.1","new":"4.7"},{"seq":183836,"id":"CVE-2026-89731","ts":1789356677614,"field":"severity","old":"high","new":"medium"},{"seq":153616,"id":"CVE-2026-89731","ts":1789285351517,"field":"cvss","old":null,"new":"7.1"},{"seq":153615,"id":"CVE-2026-89731","ts":1789285351517,"field":"severity","old":"none","new":"high"},{"seq":147151,"id":"CVE-2026-89731","ts":1789270197216,"field":"cvss","old":null,"new":"4.7"},{"seq":147150,"id":"CVE-2026-89731","ts":1789270197216,"field":"severity","old":"none","new":"medium"},{"seq":108906,"id":"CVE-2026-89731","ts":1789183729488,"field":"cvss","old":null,"new":"4.7"},{"seq":108905,"id":"CVE-2026-89731","ts":1789183729488,"field":"severity","old":"none","new":"medium"}]}