CVE-2026-63860 (GCVE-0-2026-63860)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
EPSS
VEX
Title
RDMA/core: Prefer NLA_NUL_STRING
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/core: Prefer NLA_NUL_STRING
These attributes are evaluated as c-string (passed to strcmp), but
NLA_STRING doesn't check for the presence of a \0 terminator.
Either this needs to switch to nla_strcmp() and needs to adjust printf fmt
specifier to not use plain %s, or this needs to use NLA_NUL_STRING.
As the code has been this way for long time, it seems to me that userspace
does include the terminating nul, even tough its not enforced so far, and
thus NLA_NUL_STRING use is the simpler solution.
Severity
8.4 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
30dc5e63d6a5ad24894b5512d10b228d73645a44 , < fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf
(git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 87111356d58d86edb221ba144d261ed83a5b8bbe (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < abda65bdd13084c771842adaac1f652d0660dd82 (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 137b5918931d4d05aa8ea8d3adf67f7224eef63c (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 5877c043398d5fa0e93919a3d837e5cd7a98a961 (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < f2c7b39dde2e61df8157066969cc2a408cd3dcd9 (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < c26a0052cceed4c4d380ee5808b699f937fb58d8 (git) Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 6ed3d14fc45d3da6025e7fe4a6a09066856698e2 (git) |
guessed | |
| Linux | Linux |
Affected:
3.16
Unaffected: 0 , < 3.16 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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{
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"version": "6.1.175",
"versionType": "semver"
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{
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},
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"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Prefer NLA_NUL_STRING\n\nThese attributes are evaluated as c-string (passed to strcmp), but\nNLA_STRING doesn\u0027t check for the presence of a \\0 terminator.\n\nEither this needs to switch to nla_strcmp() and needs to adjust printf fmt\nspecifier to not use plain %s, or this needs to use NLA_NUL_STRING.\n\nAs the code has been this way for long time, it seems to me that userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached when userspace sends crafted NETLINK_RDMA (protocol 20) messages to the iWARP Port Mapper netlink handlers in `iwpm_register_pid_cb()` and `iwpm_mapping_info_cb()`, not from remote network packets.\nAC:L - An attacker fully controls the netlink attribute payload and can send a maximal-length string without a NUL terminator to reliably trigger unbounded `strcmp()` reads; no race or victim-dependent state is required beyond reaching the handler.\nPR:N - IWPM netlink ops lack `RDMA_NL_ADMIN_PERM`, and `netlink_sendmsg()` only enforces `CAP_NET_ADMIN` when `dst_pid` or `dst_group` is non-zero, so an unprivileged local process can send messages to the kernel RDMA netlink socket without capabilities or user-namespace tricks.\nUI:N - Exploitation requires only a local process sending a crafted netlink message; no victim interaction such as mounting a filesystem or opening a device is needed.\nS:U - Impact is confined to kernel RDMA/iWARP port-mapper state (e.g., `iwpm_user_pid`, mapping tables) within the same kernel security authority and does not cross VM, container, or IOMMU boundaries.\nC:H - `NLA_STRING` does not enforce a NUL terminator, yet `strcmp()` reads until `\\0`, causing an out-of-bounds kernel read past the attribute boundary; error paths also pass the pointer to `%s` in `pr_info()`, enabling further kernel memory disclosure.\nI:H - By sending exactly 19 bytes of `iWarpPortMapperUser` without a terminator, an attacker can make `strcmp()` read a NUL from NLA padding and pass validation, hijacking `iwpm_user_pid` and redirecting subsequent iWARP port-mapping operations to attacker-controlled userspace.\nA:H - Unbounded `strcmp()` on a non-NUL-terminated netlink attribute can read beyond the skb buffer and trigger a kernel page fault/oops, and successful port-mapper impersonation can disrupt iWARP connectivity on affected systems."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:36:38.134Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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},
{
"url": "https://git.kernel.org/stable/c/87111356d58d86edb221ba144d261ed83a5b8bbe"
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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/6ed3d14fc45d3da6025e7fe4a6a09066856698e2"
}
],
"title": "RDMA/core: Prefer NLA_NUL_STRING",
"x_generator": {
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"cveId": "CVE-2026-63860",
"datePublished": "2026-07-19T14:04:48.153Z",
"dateReserved": "2026-07-19T07:54:57.017Z",
"dateUpdated": "2026-08-05T12:36:38.134Z",
"state": "PUBLISHED"
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{
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Prefer NLA_NUL_STRING\n\nThese attributes are evaluated as c-string (passed to strcmp), but\nNLA_STRING doesn\u0027t check for the presence of a \\0 terminator.\n\nEither this needs to switch to nla_strcmp() and needs to adjust printf fmt\nspecifier to not use plain %s, or this needs to use NLA_NUL_STRING.\n\nAs the code has been this way for long time, it seems to me that userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution."
}
],
"id": "CVE-2026-63860",
"lastModified": "2026-07-27T17:44:23.777",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-07-19T15:16:52.850",
"references": [
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"url": "https://git.kernel.org/stable/c/137b5918931d4d05aa8ea8d3adf67f7224eef63c"
},
{
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"url": "https://git.kernel.org/stable/c/5877c043398d5fa0e93919a3d837e5cd7a98a961"
},
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},
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"url": "https://git.kernel.org/stable/c/87111356d58d86edb221ba144d261ed83a5b8bbe"
},
{
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"url": "https://git.kernel.org/stable/c/abda65bdd13084c771842adaac1f652d0660dd82"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c26a0052cceed4c4d380ee5808b699f937fb58d8"
},
{
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"url": "https://git.kernel.org/stable/c/f2c7b39dde2e61df8157066969cc2a408cd3dcd9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-22T07:05:56+00:00",
"cve": "CVE-2026-63860",
"id": "CVE-2026-63860",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: RDMA/core: Prefer NLA_NUL_STRING",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63860.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-23T00:24:13Z",
"cve": "CVE-2026-63860",
"id": "CVE-2026-63860",
"initial_release_date": "2026-07-24T02:13:25Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "667",
"product_status:known_not_affected": "12",
"product_status:recommended": "130",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63860",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63860.json",
"version": "10"
}
}
}
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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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