CVE-2026-93264 (GCVE-0-2026-93264)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:52 – Updated: 2026-10-19 09:08
VLAI
Title
RDMA/efa: Fix PBL chunk length computation
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 665cd418b8561a099c3854443f8ad8ae751b72a0 (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 932e5684906a090644a9061fae2d254041c3b8f2 (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 489b28f2377afa70c18c45b06a6387f3d39bb123 (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < aadf3f9b5edb7f0a77e9172b237d2e07c754829c (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 3982714e15512b83115897806dacc94899683420 (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < da7805f0211af19968584e621074f253ac07dba7 (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 1d4b5902773475fc97151379b7e5f09cad0fa57b (git)
Affected: 40909f664d279765af430acc5db348a0b71c9b0a , < 229b42d7450c1cf96f45ec39ebb69211b06bc036 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
        }
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        "shortName": "Linux"
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    "datePublished": "2026-09-24T15:52:03.741Z",
    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-10-19T09:08:17.409Z",
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        "id": "CVE-2026-93264",
        "lastModified": "2026-10-19T10:17:17.760",
        "metrics": {},
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      "cve": "CVE-2026-93264",
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      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/efa: Fix PBL chunk length computation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93264.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-11T01:16:45Z",
      "cve": "CVE-2026-93264",
      "id": "CVE-2026-93264",
      "initial_release_date": "2026-09-24T23:48:49Z",
      "product_status:known_affected": "611",
      "product_status:known_not_affected": "39",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93264",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-93264.json",
      "version": "16"
    }
  }
}



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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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