FKIE_CVE-2026-93264

Vulnerability from fkie_nvd - Published: 2026-09-24 16:17 - Updated: 2026-09-24 16:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d4b5902773475fc97151379b7e5f09cad0fa57b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/229b42d7450c1cf96f45ec39ebb69211b06bc036
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3982714e15512b83115897806dacc94899683420
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/489b28f2377afa70c18c45b06a6387f3d39bb123
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/665cd418b8561a099c3854443f8ad8ae751b72a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/932e5684906a090644a9061fae2d254041c3b8f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aadf3f9b5edb7f0a77e9172b237d2e07c754829c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da7805f0211af19968584e621074f253ac07dba7
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/efa/efa_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "665cd418b8561a099c3854443f8ad8ae751b72a0",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "932e5684906a090644a9061fae2d254041c3b8f2",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "489b28f2377afa70c18c45b06a6387f3d39bb123",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "aadf3f9b5edb7f0a77e9172b237d2e07c754829c",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "3982714e15512b83115897806dacc94899683420",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "da7805f0211af19968584e621074f253ac07dba7",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "1d4b5902773475fc97151379b7e5f09cad0fa57b",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            },
            {
              "lessThan": "229b42d7450c1cf96f45ec39ebb69211b06bc036",
              "status": "affected",
              "version": "40909f664d279765af430acc5db348a0b71c9b0a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/efa/efa_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/efa: Fix PBL chunk length computation\n\nOn register MR, when creating the PBL, if it\u0027s an indirect PBL we create\na chunk list to hold the PBL pages pointers. Each chunk is 4KB in size\nand can hold 510 addresses (EFA_PTRS_PER_CHUNK) and has a 12-byte\ncontrol buffer at the end of it holding the next chunk\u0027s pointer and its\nlength.\n\nIf the PBL number of pages is a multiple of EFA_PTRS_PER_CHUNK, the\ncalculated last chunk length is wrongly computed as 0, even though that\nchunk is fully populated with 510 real page pointers. This wrong length\nis used both to DMA map the chunk and is propagated to the device,\ncausing the device to see the chunk as empty and reject the memory\nregistration.\n\nFix the calculation so it will be performed only if the number of pages\nisn\u0027t a multiple of EFA_PTRS_PER_CHUNK, if it is, its already handled in\nthe above loop correctly.\nAlso prevent out-of-bounds reach in the chunks array in such scenario."
    }
  ],
  "id": "CVE-2026-93264",
  "lastModified": "2026-09-24T16:17:23.193",
  "metrics": {},
  "published": "2026-09-24T16:17:23.193",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1d4b5902773475fc97151379b7e5f09cad0fa57b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/229b42d7450c1cf96f45ec39ebb69211b06bc036"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3982714e15512b83115897806dacc94899683420"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/489b28f2377afa70c18c45b06a6387f3d39bb123"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/665cd418b8561a099c3854443f8ad8ae751b72a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/932e5684906a090644a9061fae2d254041c3b8f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aadf3f9b5edb7f0a77e9172b237d2e07c754829c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da7805f0211af19968584e621074f253ac07dba7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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