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RDMA/efa: Fix PBL chunk length computation

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Fix PBL chunk length computation On register MR, when creating the PBL, if it's an indirect PBL we create a chunk list to hold the PBL pages pointers. Each chunk is 4KB in size and can hold 510 addresses (EFA_PTRS_PER_CHUNK) and has a 12-byte control buffer at the end of it holding the next chunk's pointer and its length. If the PBL number of pages is a multiple of EFA_PTRS_PER_CHUNK, the calculated last chunk length is wrongly computed as 0, even though that chunk is fully populated with 510 real page pointers. This wrong length is used both to DMA map the chunk and is propagated to the device, causing the device to see the chunk as empty and reject the memory registration. Fix the calculation so it will be performed only if the number of pages isn't a multiple of EFA_PTRS_PER_CHUNK, if it is, its already handled in the above loop correctly. Also prevent out-of-bounds reach in the chunks array in such scenario.

Announced Source revision 1
Original source ↗

CVE-2026-93264

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-2026-93264

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": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "665cd418b8561a099c3854443f8ad8ae751b72a0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "932e5684906a090644a9061fae2d254041c3b8f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "489b28f2377afa70c18c45b06a6387f3d39bb123",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "aadf3f9b5edb7f0a77e9172b237d2e07c754829c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "3982714e15512b83115897806dacc94899683420",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "da7805f0211af19968584e621074f253ac07dba7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "1d4b5902773475fc97151379b7e5f09cad0fa57b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40909f664d279765af430acc5db348a0b71c9b0a",
        "lessThan": "229b42d7450c1cf96f45ec39ebb69211b06bc036",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/efa/efa_verbs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/efa/efa_verbs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93264

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37957 · Revision 1
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Publisher date
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