CVE-2026-74394 (GCVE-0-2026-74394)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
EPSS
VEX
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)
Assigner
References
8 references
Impacted products
2 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 | |
| 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 |
{
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"descriptions": [
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"lang": "en",
"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."
}
],
"metrics": [
{
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"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:46:39.840Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/c82c860f8c8e4f4f454c9f14d0ad0c0466965f7d"
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{
"url": "https://git.kernel.org/stable/c/3efa5301137140a3ca3677a9098c0a93a0acfd49"
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{
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{
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{
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{
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{
"url": "https://git.kernel.org/stable/c/eb4ecdf631fe00e8020bf461503cb9b7017ed796"
}
],
"title": "RDMA/srpt: fix integer overflow in immediate data length check",
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"cveId": "CVE-2026-74394",
"datePublished": "2026-08-15T05:59:07.144Z",
"dateReserved": "2026-08-15T05:44:03.891Z",
"dateUpdated": "2026-08-17T05:46:39.840Z",
"state": "PUBLISHED"
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{
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"descriptions": [
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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."
}
],
"id": "CVE-2026-74394",
"lastModified": "2026-08-17T06:19:34.430",
"metrics": {
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"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:41.363",
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"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"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-10-05T23:56:09Z",
"cve": "CVE-2026-74394",
"id": "CVE-2026-74394",
"initial_release_date": "2026-08-29T01:08:26Z",
"product_status:known_affected": "588",
"product_status:known_not_affected": "129",
"product_status:recommended": "446",
"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": "19"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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