Vulnerability-Lookup

GHSA-CQCH-VJQ7-8XRC

Vulnerability from github – Published: 2026-07-19 15:30 – Updated: 2026-07-20 15:31

Details

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)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63860"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T15:16:52Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-cqch-vjq7-8xrc",
  "modified": "2026-07-20T15:31:48Z",
  "published": "2026-07-19T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63860"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/137b5918931d4d05aa8ea8d3adf67f7224eef63c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5877c043398d5fa0e93919a3d837e5cd7a98a961"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ed3d14fc45d3da6025e7fe4a6a09066856698e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87111356d58d86edb221ba144d261ed83a5b8bbe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abda65bdd13084c771842adaac1f652d0660dd82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c26a0052cceed4c4d380ee5808b699f937fb58d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2c7b39dde2e61df8157066969cc2a408cd3dcd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-63860 (GCVE-0-2026-63860)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36

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)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/fcd07d3b8ee7a39b3…
https://git.kernel.org/stable/c/87111356d58d86edb…
https://git.kernel.org/stable/c/abda65bdd13084c77…
https://git.kernel.org/stable/c/137b5918931d4d05a…
https://git.kernel.org/stable/c/5877c043398d5fa0e…
https://git.kernel.org/stable/c/f2c7b39dde2e61df8…
https://git.kernel.org/stable/c/c26a0052cceed4c4d…
https://git.kernel.org/stable/c/6ed3d14fc45d3da60…

Impacted products

2 products

Vendor	Product	Version
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)
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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/iwpm_msg.c"
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          "versions": [
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              "lessThan": "fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf",
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            {
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            {
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              "versionType": "git"
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              "version": "3.16"
            },
            {
              "lessThan": "3.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
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        }
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      "cpeApplicability": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "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."
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "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."
            }
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        }
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        "dateUpdated": "2026-08-05T12:36:38.134Z",
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      "title": "RDMA/core: Prefer NLA_NUL_STRING",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63860",
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    "dateReserved": "2026-07-19T07:54:57.017Z",
    "dateUpdated": "2026-08-05T12:36:38.134Z",
    "state": "PUBLISHED"
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}

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.

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.
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GHSA-CQCH-VJQ7-8XRC

CVE-2026-63860 (GCVE-0-2026-63860)

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