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CVE-2026-74394 (GCVE-0-2026-74394)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
RDMA/srpt: fix integer overflow in immediate data length check
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: fix integer overflow in immediate data length check imm_buf->len is a user-controlled uint32_t received from the network. Adding it to imm_data_offset without overflow checking allows a malicious initiator to send len=0xFFFFFFFF, causing req_size to wrap around to a small value, bypassing the bounds check, and subsequently passing a ~4GB length to sg_init_one(). Use check_add_overflow() to detect wrapping before the comparison.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < c82c860f8c8e4f4f454c9f14d0ad0c0466965f7d (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < 3efa5301137140a3ca3677a9098c0a93a0acfd49 (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < 067b9556eeb007f28b7c2033b4dcde5b6d88418f (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < dcf7a986f377cce0749ed53f1d64195fbd5fdf91 (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < 07dec3f6dcb6c6cc891162d252b800eb0e6d5e8e (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < 65572fbd86033ae2370125593d59b8be34253aaf (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < 72497172a4799119a0282a5eb5e2b8ddcc821921 (git)
Affected: 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639 , < eb4ecdf631fe00e8020bf461503cb9b7017ed796 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (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/srpt: fix integer overflow in immediate data length check\n\nimm_buf-\u003elen is a user-controlled uint32_t received from the network.\nAdding it to imm_data_offset without overflow checking allows a\nmalicious initiator to send len=0xFFFFFFFF, causing req_size to wrap\naround to a small value, bypassing the bounds check, and subsequently\npassing a ~4GB length to sg_init_one().\n\nUse check_add_overflow() to detect wrapping before the comparison."
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              "value": "AV:N - SRPT is an in-kernel SCSI RDMA target reached by remote initiators over InfiniBand/RoCE via RDMA/IB CM; malicious SRP_CMD IUs are delivered through `srpt_recv_done()` without any local syscall or physical access.\nAC:L - Once connected on an immediate-data SRPT target (use_srq=0), a malicious initiator deterministically sets `imm_buf-\u003elen=0xFFFFFFFF` to wrap `req_size` and bypass checks; no race or attacker-uncontrollable condition is required.\nPR:N - SRPT enables LIO demo mode (`srpt_check_true`), so any remote initiator that completes SRP login on an enabled target gets a dynamic ACL without target-local credentials, root, or CAP_NET_ADMIN on the victim host.\nUI:N - Exploitation requires only attacker-initiated RDMA connection, SRP login, and crafted SRP_CMD traffic; no administrator or other user must mount storage or perform any action on the target.\nS:U - The integer overflow corrupts kernel heap memory and SCSI-target processing within the host kernel\u0027s own security authority; it does not cross VM, IOMMU, or container sandbox boundaries.\nC:H - Passing a ~4GB length to `sg_init_one()` on a small receive buffer creates a massive out-of-bounds scatterlist; subsequent target-core DMA/map operations can read far beyond the buffer, enabling arbitrary kernel memory disclosure.\nI:H - The bogus scatterlist gives the block/SCSI target path an attacker-controlled ~4GB kernel memory write/read primitive over adjacent heap objects, exploitable for control-flow hijacking and privilege escalation.\nA:H - Out-of-bounds access from a ~4GB scatterlist on a kilobyte-scale receive buffer readily triggers kernel oops, KASAN faults, or panic, denying availability even before full exploitation."
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T22:17:33+00:00",
      "cve": "CVE-2026-74394",
      "id": "CVE-2026-74394",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/srpt: fix integer overflow in immediate data length check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74394.json",
      "version": "3"
    }
  }
}



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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.