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)
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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)
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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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    "dateUpdated": "2026-08-17T05:46:39.840Z",
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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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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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      "current_release_date": "2026-08-20T22:17:33+00:00",
      "cve": "CVE-2026-74394",
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      "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"
    },
    "suse_vex": {
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      "current_release_date": "2026-09-24T16:29:24Z",
      "cve": "CVE-2026-74394",
      "id": "CVE-2026-74394",
      "initial_release_date": "2026-08-29T01:08:26Z",
      "product_status:first_fixed": "164",
      "product_status:known_affected": "546",
      "product_status:known_not_affected": "129",
      "product_status:recommended": "259",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74394",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74394.json",
      "version": "13"
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.