CVE-2026-89731
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, cxl_rch_get_aer_info() reads AER registers beyond the mapped block because sizeof(struct aer_capability_regs) exceeds the physical AER capability size. The over-read can also cause a second out-of-bounds in pcie_print_tlp_log().
Risk Assessment
Can lead to out-of-bounds memory read, causing system crash or information leak. Systems with CXL and RCH Downstream Port are at risk.
Recommendation
Update the Linux kernel to a version containing the fix that bounds the read to physical AER registers and zeroes the destination buffer.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS