CVE-2026-89731 is a vulnerability in Linux Kernel
Published on September 11, 2026
cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read
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.
Products Associated with CVE-2026-89731
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Affected Versions
Linux:- Version 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and below 8bd3523df1319edc61cd391e695c84a4618516df is affected.
- Version 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and below 8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced is affected.
- Version 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and below 29458e62d0829cbc99435f3e44fd560f9bbf1da7 is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.