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CVE-2026-74346 (GCVE-0-2026-74346)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
RDMA/irdma: Fix OOB read during CQ MR registration
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix OOB read during CQ MR registration Sashiko pointed out an unrelated bug during a previous patch: https://sashiko.dev/#/patchset/20260512183852.614045-1-jmoroni%40google.com This change fixes the bug by eliminating the cqmr->split field which was not being set properly and instead just checks the CQ resize feature flag directly. The cqmr->split field essentially tracks whether IRDMA_FEATURE_CQ_RESIZE is set, but it was not being set until CQ creation time, which is _after_ CQ memory registration (the only other place where it is referenced). As a result, it would always be false during MR registration and would therefore cause irdma_handle_q_mem to populate cqmr->shadow even for GEN_2 HW and beyond: cqmr->shadow = (dma_addr_t)arr[req->cq_pages]; The issue is that for GEN_2 and beyond, req->cq_pages may be exactly equal to iwmr->page_cnt and therefore equal to the size of arr, which would cause an OOB read by one.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < a80b3b13786e9ab1c52b31a1f16c7d6708fa9220 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < 3159c6fac43dc24b34d31971884d98a7a1bf4c4b (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < ad360a31092a870633ec255b96f50181628b4de0 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < d566002de555b18cc395012c5c1cb8682fc6d2a9 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < 54cab78df0375196aaec4e3109191653d21751df (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < d5aa82da8f65562da996d184686db9d0ea718b91 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < 4385ddd654d90245eeb83b3cb539670ab5c85ba4 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (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/irdma: Fix OOB read during CQ MR registration\n\nSashiko pointed out an unrelated bug during a previous patch:\nhttps://sashiko.dev/#/patchset/20260512183852.614045-1-jmoroni%40google.com\n\nThis change fixes the bug by eliminating the cqmr-\u003esplit field which\nwas not being set properly and instead just checks the CQ resize\nfeature flag directly.\n\nThe cqmr-\u003esplit field essentially tracks whether IRDMA_FEATURE_CQ_RESIZE\nis set, but it was not being set until CQ creation time, which is _after_\nCQ memory registration (the only other place where it is referenced).\n\nAs a result, it would always be false during MR registration and would\ntherefore cause irdma_handle_q_mem to populate cqmr-\u003eshadow even for GEN_2\nHW and beyond:\n\n    cqmr-\u003eshadow = (dma_addr_t)arr[req-\u003ecq_pages];\n\nThe issue is that for GEN_2 and beyond, req-\u003ecq_pages may be exactly equal\nto iwmr-\u003epage_cnt and therefore equal to the size of arr, which would cause\nan OOB read by one."
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during MR registration and would\\ntherefore cause irdma_handle_q_mem to populate cqmr-\u003eshadow even for GEN_2\\nHW and beyond:\\n\\n    cqmr-\u003eshadow = (dma_addr_t)arr[req-\u003ecq_pages];\\n\\nThe issue is that for GEN_2 and beyond, req-\u003ecq_pages may be exactly equal\\nto iwmr-\u003epage_cnt and therefore equal to the size of arr, which would cause\\nan OOB read by 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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.