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.
CVE-2026-89731
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89731
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab",
"lessThan": "7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab",
"lessThan": "8bd3523df1319edc61cd391e695c84a4618516df",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab",
"lessThan": "8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab",
"lessThan": "29458e62d0829cbc99435f3e44fd560f9bbf1da7",
"versionType": "git"
}
],
"programFiles": [
"drivers/cxl/core/ras_rch.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cxl/core/ras_rch.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89731
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35208 · Revision 1
- Added to Heist Feed
- Publisher date