CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of the AER (Advanced Error Reporting) capability, specifically in the `cxl_rch_get_aer_info()` function, which can lead to out-of-bounds reads due to a mismatch between the software structure and the actual hardware layout. This flaw can potentially allow attackers to exploit the out-of-bounds read to access sensitive memory areas, leading to information disclosure or system instability. Organizations using affected Linux kernel versions should prioritize patching this vulnerability to mitigate the risk of exploitation.
Original NVD Description
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.