CVE-2026-89731

CVE CVE-2026-89731EUVD EUVD-2026-76643Published 2026-09-11T19:46:41.000ZLast changed 2026-09-13T06:33:45.000ZCVSS 7.1

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read cxl_rch_get_aer_info() copies the RCH Downstream Port AER capability from the RCRB MMIO block using a readl() loop bounded by sizeof(struct aer_capability_regs). This struct is a software layout and its embedded struct pcie_tlp_log is larger than the on-wire AER capability. As a result the loop reads past the mapped AER register block. The over-read also populates the software-only tail fields including header_log.header_len. An out-of-range header_len passed to pcie_print_tlp_log() can then loop past the header log buffer and cause a second out-of-bounds read. The read was correct when introduced, but struct pcie_tlp_log has since grown (Header Log and TLP Prefix Log sizes, header_len and flit fields), so sizeof(struct aer_capability_regs) no longer matches the physical AER capability. Bound the read to the physical AER registers, header through the 16 byte Header Log. Zero the destination first so the software-only fields are deterministic.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab <8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced; patch: 7.2.4; patch: 7.3-rc1; patch: 0; 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab <8bd3523df1319edc61cd391e695c84a4618516df; 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab <29458e62d0829cbc99435f3e44fd560f9bbf1da7; 6.7; patch: 6.18.51

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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