Skip to content
Heist/ feed
High

cxl: Fix CXL_HEADERLOG_SIZE to match RAS Capability size

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: cxl: Fix CXL_HEADERLOG_SIZE to match RAS Capability size The CXL r4.0 8.2.4.17.7 RAS Capability Structure has total length 0x58 bytes (CXL_RAS_CAPABILITY_LENGTH); the Header Log occupies the trailing 64 bytes at offset 0x18. CXL_HEADERLOG_SIZE was defined as SZ_512, eight times the actual on-device size. header_log_copy() reads CXL_HEADERLOG_SIZE_U32 (128) dwords from the RAS capability iomap, overrunning the 88-byte mapping by 448 bytes. The cxl_aer_uncorrectable_error trace event memcpy()s CXL_HEADERLOG_SIZE (512) bytes from its source. For the CPER caller the source is struct cxl_ras_capability_regs::header_log[16] (64 bytes) embedded in a stack-local cxl_cper_prot_err_work_data, so the memcpy reads 448 bytes of kernel stack into the trace event ring buffer where userspace can read it via tracefs. Set CXL_HEADERLOG_SIZE to 64 and derive CXL_HEADERLOG_SIZE_U32 from it, bringing all iomap readers into agreement on 16 dwords. Userspace tools such as rasdaemon have grown a dependency on the buggy 512-byte (128 u32) header_log layout in the cxl_aer_uncorrectable_error trace event. Add CXL_HEADERLOG_TRACE_SIZE_U32 = 128 and use it for the trace event __array and its memcpy to preserve that ABI. Both callers now pass a zero-filled u32[CXL_HEADERLOG_TRACE_SIZE_U32] staging buffer with only the first CXL_HEADERLOG_SIZE_U32 (16) entries populated from hardware; the remaining 112 u32s are zero-padded, keeping the 512

Announced Source revision 1
Original source ↗

CVE-2026-80662

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-2026-80662

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": "2905cb5236cba63a5dc8a83752dcc31f3cc819f9",
        "lessThan": "d031617045dc743764ea574432e5c2a3757b4e57",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2905cb5236cba63a5dc8a83752dcc31f3cc819f9",
        "lessThan": "e3e8f3b760bcf6a4b3aec412015b74b578729006",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2905cb5236cba63a5dc8a83752dcc31f3cc819f9",
        "lessThan": "6fc1919a6f2ed541484dd1f6cd93374044f8fd3d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2905cb5236cba63a5dc8a83752dcc31f3cc819f9",
        "lessThan": "fc5eb0962a5e50d64e711817cc24d67df2d90528",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2905cb5236cba63a5dc8a83752dcc31f3cc819f9",
        "lessThan": "c268f949e219f9e179558e836f457f6c5fbec416",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/cxl/core/ras.c",
      "drivers/cxl/core/trace.h",
      "drivers/cxl/cxl.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/cxl/core/ras.c",
      "drivers/cxl/core/trace.h",
      "drivers/cxl/cxl.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80662

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46623 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement